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  • 1.
    Ahmadian, Afshin
    et al.
    KTH, Superseded Departments, Biotechnology.
    Russom, Aman
    KTH, Superseded Departments, Biotechnology.
    Andersson, Helene
    KTH, Superseded Departments, Biotechnology.
    Uhlén, Mathias
    KTH, Superseded Departments, Biotechnology.
    Stemme, Göran
    KTH, Superseded Departments, Biotechnology.
    Nilsson, Peter
    KTH, Superseded Departments, Biotechnology.
    SNP analysis by allele-specific extension in a micromachined filter chamber2002In: BioTechniques, ISSN 0736-6205, E-ISSN 1940-9818, Vol. 32, no 4, p. 748-754Article in journal (Refereed)
  • 2.
    Aljadi, Zenib
    et al.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. Karolinska Institute, Sweden.
    Mansouri, Ladan
    Nopp, Anna
    Paulsson, Josefin M.
    Winqvist, Ola
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Stahl, Marten
    Hylander, Britta
    Jacobson, Stefan H.
    Lundahl, Joachim
    Activation of Basophils Is a New and Sensitive Marker of Biocompatibility in Hemodialysis2014In: Artificial Organs, ISSN 0160-564X, E-ISSN 1525-1594, Vol. 38, no 11, p. 945-953Article in journal (Refereed)
    Abstract [en]

    The hemodialysis procedure involves contact between peripheral blood and the surface of dialyzer membranes, which may lead to alterations in the pathways of innate and adaptive immunity. We aimed to study the effect of blood-membrane interaction on human peripheral basophils and neutrophils in hemodialysis with high- and low-permeability polysulfone dialyzers. The surface expression of CD203c (basophil selection marker) and CD63 (activation marker) after activation by the bacterial peptide formyl-methionyl-leucyl-phenylalanine (fMLP) or anti-Fc epsilon receptor I (Fc epsilon RI) antibody and the absolute number of basophils was investigated before and after hemodialysis with each of the dialyzers. Moreover, the expression on neutrophils of CD11b, the CD11b active epitope, and CD88 was analyzed in the same groups of individuals. The expression of CD63 in basophils following activation by fMLP was significantly higher in the patient group compared with that in healthy controls, but no differences were observed after activation by anti-Fc epsilon RI. During the hemodialysis procedure, the low-flux membrane induced up-regulation of CD63 expression on basophils, while passage through the high-flux membrane did not significantly alter the responsiveness. In addition, the absolute number of basophils was unchanged after hemodialysis with either of the dialyzers and compared with healthy controls. We found no significant differences in the expression of the neutrophil activation markers (CD11b, the active epitope of CD11b, and CD88) comparing the two different dialyzers before and after dialysis and healthy controls. Together, these findings suggest that alterations in basophil activity may be a useful marker of membrane bioincompatibility in hemodialysis.

  • 3.
    Aljadi, Zenib
    et al.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. Karolinska Inst, Sweden.
    Nopp, Anna
    Winqvist, Ola
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. Karolinska Inst, Sweden.
    Hylander, Britta
    Jacobson, Stefan H.
    Lundahl, Joachim
    Altered basophil function in patients with chronic kidney disease on hemodialysis2017In: Clinical Nephrology, ISSN 0301-0430, Vol. 88, no 2, p. 86-96Article in journal (Refereed)
    Abstract [en]

    Aims: Chronic kidney disease (CKD) leads to impairment of immune cell function. Given the potential role of basophils in the pathogenesis of CKD, we aimed to study the basophil responsiveness towards microbial antigen exposure, judged as adhesion molecule expression and degranulation, in CKD patients on hemodialysis. Materials and methods: We selected markers linked to two crucial biological phases: the transmigration and degranulation processes, respectively. For the transmigration process, we selected the adhesion molecules CD11b, active CD11b epitope, and CD62L and for the degranulation process CD203c (piecemeal degranulation marker), CD63 (degranulation marker), and CD300a (inhibitory marker of degranulation). We measured basophil responsiveness after stimulation of different activation pathways in basophils using lipopolysaccharide (LPS), peptidoglycan (PGN), formyl-methyinoyl-leucyl-phenylalanine (fMLP), and anti-FceRI-ab. Results: The expression of CD63 in basophils following activation by fMLP was significantly higher in the patient group compared to matched healthy controls, but no differences were observed after activation by anti-Fc.RI. CD300a expression was significantly higher in patients following activation by fMLP and anti-Fc.RI, and the active epitope CD11b expression was significantly higher in patients after LPS activation. In addition, we found that CD62L was not shed from the cell surface after activation with LPS and fMLP. A slight downregulation was noted after activation with anti-Fc.RI in healthy controls. Conclusion: Together, these data demonstrate that basophil functions related to adhesion and degranulation are altered in CKD patients on hemodialysis, which indicates a potential role for the basophil in the pathogenesis of complications related to infections.

  • 4.
    Amasia, Mary
    et al.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Zelenin, Sergey
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Asalapuram, Pavankumar
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Modified DVD-drive as an integrated microfluidic system for precipitate-based detection of LAMP assay2013In: 17th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2013, 2013, Vol. 3, p. 1616-1618Conference paper (Refereed)
    Abstract [en]

    Loop-mediated isothermal amplification (LAMP) is a sensitive method for nucleic acid analysis, and has been demonstrated as a ideal technique for use in miniaturized microfluidic systems. While LAMP assays are often detected using absorbance or fluorescence, we demonstrate an integrated system for LAMP assays through the detection of precipitate formation using a modified commercial DVD drive. This integrated DVD drive system is able to automate the sedimentation process and scattering-based detection of accumulated precipitate, as well as maintain the constant temperature needed for LAMP analysis.

  • 5.
    Ardabili, Sahar
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Gantelius, Jesper
    KTH, School of Biotechnology (BIO), Nano Biotechnology (closed 20130101).
    Kowalewski, Jacob
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Brismar, Hjalmar
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Russom, Aman
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Dean flow-coupled inertial focusing for ultra-high-throughput particle filtration2010In: 14th International Conference on Miniaturized Systems for Chemistry and Life Sciences 2010, MicroTAS 2010: Volume 3, 2010, p. 1586-1588Conference paper (Refereed)
    Abstract [en]

    Particle manipulation represents an important and fundamental step prior to counting, sorting and detecting bio-particles. In this study, we report dean-coupled inertial focusing of particles in flows through a single curve microchannel at extremely high channel Reynold numbers (∼325). We found the lateral particle focusing position, xf to be fixed and largely independent of radius of curvature and whether particles are pre-focused (at equilibrium) entering the curvature or randomly distributed. Finally, using a single inlet, u-shaped, microchannel we demonstrate filtration of 10μm particles from 2 μm particles at throughputs several orders of magnitude higher than previously shown.

  • 6.
    Ardabili, Sahar
    et al.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Zelenin, Sergey
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Epitope unmasking for improved immuno-magnetic isolation of Gram-negative bacteriaManuscript (preprint) (Other academic)
  • 7.
    Banerjee, I.
    et al.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Zelenin, Sergey
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Slipdisc: A versatile sample preparation platform2015In: MicroTAS 2015 - 19th International Conference on Miniaturized Systems for Chemistry and Life Sciences, Chemical and Biological Microsystems Society , 2015, p. 1256-1258Conference paper (Refereed)
    Abstract [en]

    We present "SlipDisc", a versatile sample preparation platform based on slipchip1 technology. The SlipDisc platform uses polycarbonate CDs and laser cut PSA instead of glass and a hand-winded mechanical clock mechanism to precisely manipulate minute amount of liquid. The innovative hand-winded mechanical "clockwork" that enables sample processing from one spot to another with defined precision. As a prof of principle of bioassay, we show HRP enzyme reacting with TMB substrate and a multilayer architecture used in manipulation of magnetic beads through an immiscible oil phase. Our long-term goal is to develop a sample-in-result-out multi-parametric bioanalytical SlipDisc platform specifically designed to need the needs at resource-limited settings for point of care molecular diagnostics.

  • 8.
    Banerjee, Indradumna
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Nano Biotechnology.
    Russom, Aman
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Nano Biotechnology.
    Lab-on-DVD: Optical Disk Drive-Based Platforms for Point-of-Care Diagnostics2018In: Frugal Innovation in Bioengineering for the Detection of Infectious Diseases / [ed] AK Chavali, R Ramji, Switzerland: Springer, 2018, 2, p. 23-38Chapter in book (Refereed)
    Abstract [en]

    There is a growing demand for simple, affordable, reliable and quality-assured point-of-care (POC) diagnostics for use in resource-limited settings. Among the top ten leading causes of death worldwide, three are infectious diseases, namely, respiratory infections, HIV/AIDS and diarrheal diseases (World Health Organization 2012). Although high-quality diagnostic tests are available, these are often not available to patients in developing countries. While recent development in microfluidics and “lab-on-a-chip” devices has the potential to spur the development of protocols and affordable instruments for diagnosis of infectious disease at POC, integration of complex sample preparation and detection into automated molecular and cellular systems remain a bottleneck for implementation of these systems at resource-limited settings. Towards this, we describe here how low-cost optical drives can, with minor modifications, be turned into POC diagnostic platforms. A DVD drive is essentially a highly advanced and low-cost optical laser-scanning microscope, with the capability to deliver high-resolution images for biological applications. Furthermore, the inherent centrifugal force on rotational discs is elegantly used for sample preparation and integration. Hence, the merging of low-cost optical disc drives with centrifugal microfluidics is feasible concept for POC diagnostics, specifically designed to meet the needs at resource-limited settings.

  • 9.
    Banerjee, Indradumna
    et al.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Salih, Tagrid
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Erlandsson, Johan
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
    Pettersson, Torbjörn
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science. KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center BiMaC Innovation. KTH, Superseded Departments (pre-2005), Chemistry.
    Araújo, A. C.
    Karlsson, M.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Slipdisc: A versatile sample preparation platform for point of care diagnostics2017In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 7, no 56, p. 35048-35054Article in journal (Refereed)
    Abstract [en]

    We report a microfluidic sample preparation platform called "Slipdisc" based on slipchip technology. Slipdisc is a rotational slipchip that uses a unique hand-wound clockwork mechanism for precise movement of specially fabricated polycarbonate discs. In operation, the microchannels and microchambers carved on the closely aligned microfluidic discs convert from continuous filled paths to defined compartments using the slip movement. The clockwork mechanism introduced here is characterised by a food dye experiment and a conventional HRP TMB reaction before measuring lactate dehydrogenase (LDH) enzyme levels, which is a crucial biomarker for neonatal diagnostics. The colorimetry based detection of LDH was performed with an unmodified camera and an image analysis procedure based on normalising images and observing changes in red channel intensity. The analysis showed a close to unity coefficient of determination (R2 = 0.96) in detecting the LDH concentration when compared with a standard Chemical Analyser, demonstrating the excellent performance of the slipdisc platform with colorimetric detection. The versatile point of care sample preparation platform should ideally be suited for a multitude of applications at resource-limited settings.

  • 10. Bose, I.
    et al.
    Ohlander, Anna
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Kutter, C.
    Russom, Aman
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    An integrated all foil based micro device for point of care diagnostic applications2018In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 259, p. 917-925Article in journal (Refereed)
    Abstract [en]

    Point-of-Care (POC) diagnostics often fail to meet the market requirements of low cost and advanced functionality, and are often limited to lateral flow based serological diagnostics with reduced sensitivity and specificity. We report here on an integrated microfluidic absorbance measurement device fabricated by roll-to-roll (R2R) compatible manufacturing processes, suitable for low cost POC systems. It is a device exclusively made of foils and takes external light from a low cost LED and converts the point light source to a homogeneous light via a foil based optical filter at the bottom of the device. The light is converted to an electrical signal by an amorphous organic semiconductor (OSC) material, integrated with screen-printed carbon finger on top of the device for electrical measurement. As a proof of principle, we demonstrate DNA hybridization assay, where the target DNA is coupled to magnetic beads for absorbance measurement. The device successfully distinguishes between matched and mismatched DNA hybridization and can differentiate between 1 μM, 50 nM and 2.5 nM DNA target concentrations. The inherent characteristics of the substrates and R2R fabrication concept significantly reduce the cost, making it suitable for POC applications at resource-limited settings. 

  • 11. Bose, Indranil
    et al.
    Ohlander, Anna
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Kutter, Christoph
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    DNA Analysis on integrated all foil based microdevicesManuscript (preprint) (Other academic)
  • 12.
    Dånmark, Staffan
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
    Gladnikoff, Micha
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
    Frisk, Thomas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Zelenina, Marina
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Mustafa, Kamal
    Russom, Aman
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Finne-Wistrand, Anna
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
    Development of a novel microfluidic device for long-term in situ monitoring of live cells in 3-dimensional matrices2012In: Biomedical microdevices (Print), ISSN 1387-2176, E-ISSN 1572-8781, Vol. 14, no 5, p. 885-893Article in journal (Refereed)
    Abstract [en]

    Using the latest innovations in microfabrication technology, 3-dimensional microfluidic cell culture systems have been developed as an attractive alternative to traditional 2-dimensional culturing systems as a model for long-term microscale cell-based research. Most microfluidic systems are based on the embedding of cells in hydrogels. However, physiologically realistic conditions based on hydrogels are difficult to obtain and the systems are often too complicated. We have developed a microfluidic cell culture device that incorporates a biodegradable rigid 3D polymer scaffold using standard soft lithography methods. The device permits repeated high-resolution fluorescent imaging of live cell populations within the matrix over a 4 week period. It was also possible to track cell development at the same spatial location throughout this time. In addition, human primary periodontal ligament cells were induced to produce quantifiable calcium deposits within the system. This simple and versatile device should be readily applicable for cell-based studies that require long-term culture and high-resolution bioimaging.

  • 13.
    Dånmark, Staffan
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
    Gladnikoff, Micha
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
    Frisk, Thomas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Zelenina, Marina
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Mustafa, Kamal
    Insititutt for klinisk Odontologi, Medicinska och Odontologiska Fakulteten, Universitetet i Bergen, Norge.
    Russom, Aman
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Finne-Wistrand, Anna
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
    Development of Novel Microfluidic Device for Long-Term in situ Monitoring of Live Cells in 3-dimensional MatricesManuscript (preprint) (Other academic)
  • 14.
    Etcheverry, S.
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Faridi, A.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Ramachandraiah, H.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Margulis, W.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Laurell, F.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Russom, A.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Optofludics in microstructured fibers combining particle elasto-inertial focusing and fluorescence2016In: 2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE conference proceedings, 2016Conference paper (Refereed)
    Abstract [en]

    Optofluidics is exploited in an all-fiber component to detect and identify through fluorescence particles flowing at high rate and inertially focused in a capillary. The system represents a first step towards an in-fiber flow cytometer.

  • 15.
    Etcheverry, Sebastian
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Faridi, Asim
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Kumar, Tharagan
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    All silica fibre microflow cytometerManuscript (preprint) (Other academic)
    Abstract [en]

    Flow cytometry is currently the gold standard for analysis of cells in the medical laboratory and biomedical research. Fuelled by the need of point-of-care diagnosis, a significant effort has been made to miniaturize and reduce cost of flow cytometers. However, despite recent advances, current microsystems remain less versatile and much slower than their large-scale counterparts. In this work, an all-silica fibre microflow cytometer is presented that measures fluorescence and scattering from particles and cells. It integrates cell transport in circular capillaries and light delivery by optical fibres   Single-stream cell focusing is performed by Elasto-inertial microfluidics to guarantee optical accuracy and sensitivity.  The capability of this technique is extended to high flow rates (up to 800 µl/min), enabling throughput of 2500 particles/s. The robust, portable and low-cost system described here could be the basis for a point-of-care flow cytometer with a performance comparable to commercial systems. 

  • 16.
    Etcheverry, Sebastian
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Faridi, Muhammad Asim
    KTH. mafaridi@kth.se.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Margulis, Walter
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Optical Fiber inertial focusing based micro FlowcytometerIn: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723Article in journal (Refereed)
    Abstract [en]

    Flow cytometry is a powerful method for analysis of cells and particles. Fueled by the need for point of care diagnostic applications, a significant effort has been made to miniaturize flow cytometry. However, despite recent advances, current microflow cytometers remain less versatile and much slower than their large-scale counterparts. Here, we present a portable all-silica optofluidic device that integrates particle focusing in flow through cylindrical silica capillaries and light delivery in optical fibers to simultaneously measure fluorescence and scattering from cells and particles at a rate of 2500 particles/s – a throughput comparable to conventional cytometers. Precise 3D cell focusing and ordering is accomplished using extended elasto-inertial focusing (EEF), a key enabler for eliminating the sheath fluid commonly employed in flow cytometry with maintained high throughput. We demonstrate simultaneously two-color fluorescence and scattering measurement of different sized particles and cells. This robust and low-cost optofluidic device, assembled without the need of clean-room facilities, is ideal suited for point of care applications.

  • 17.
    Etcheverry, Sebastian
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. RISE Acreo AB, Sweden.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Fluidic trapping and optical detection of microparticles with a functional optical fiberIn: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087Article in journal (Other academic)
    Abstract [en]

    A fiber probe is presented that traps single micro-sized particles and allows detection of their optical properties. The trapping mechanism used is based on fluid suction with a micro-structured optical fiber that has five holes along its cladding. Proof-of-principle experiments with a diluted solution of fluorescently labeled particles are performed. The fiber probe presented here may find various applications in life-science and environmental monitoring.  

  • 18.
    Etcheverry, Sebastián
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. RISE Acreo AB, Sweden.
    Faridi, Muhammad Asim
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Kumar, T.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. RISE Acreo AB, Sweden.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    High performance micro-flow cytometer based on optical fibres2017In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 5628Article in journal (Refereed)
    Abstract [en]

    Flow cytometry is currently the gold standard for analysis of cells in the medical laboratory and biomedical research. Fuelled by the need of point-of-care diagnosis, a significant effort has been made to miniaturize and reduce cost of flow cytometers. However, despite recent advances, current microsystems remain less versatile and much slower than their large-scale counterparts. In this work, an all-silica fibre microflow cytometer is presented that measures fluorescence and scattering from particles and cells. It integrates cell transport in circular capillaries and light delivery by optical fibres. Single-stream cell focusing is performed by Elasto-inertial microfluidics to guarantee accurate and sensitive detection. The capability of this technique is extended to high flow rates (up to 800 mu l/min), enabling a throughput of 2500 particles/s. The robust, portable and low-cost system described here could be the basis for a point-of-care flow cytometer with a performance comparable to commercial systems.

  • 19.
    Etcheverry, Sebastián
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics. Dept. of Fiber Optics, Acreo Swedish ICT AB, Sweden .
    Faridi, Muhammad Asim
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Margulis, W.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    All fiber based micro-flow cytometer by combining optical fiber with inertial focusing2016In: 20th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2016, Chemical and Biological Microsystems Society , 2016, p. 1655-1656Conference paper (Refereed)
    Abstract [en]

    Towards a portable point of care flow cytometry platform, we present here an integrated all optical fiber-based optofluidic system capable of counting and discriminating fluorescent particles and cells. The robust and compact device incorporates optical fibers and circular capillaries to build an all-fiber optofluidic device to enable counting particles based on their fluorescent and back-scatter light emission. Here, we combine this with inertial- and elasto-inertial microfluidics for sheathless particle and cell focusing for integrated detection with scattering and fluorescence detections - all necessary components of standard cytometers. We validated the system for cell counting based on scattering and fluorescence.

  • 20.
    Etcheverry, Sebastián
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics. Department of Fiber Optics, RISE Acreo AB, Stockholm, Sweden.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Trapping and optical identification of microparticles in a liquid with a functional optical fiber probe2018In: Optics InfoBase Conference Papers, Optical Society of America, 2018Conference paper (Refereed)
    Abstract [en]

    A fiber probe traps single micrometer-particles by fluid suction into a hollow microstructure and enables optical identification by the fluorescence light collected in a fiber core. The probe finds applications in life-science and environmental monitoring.

  • 21.
    Faridi, M. A.
    et al.
    KTH, School of Biotechnology (BIO). KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Ramachandraiah, H.
    KTH, School of Biotechnology (BIO).
    Iranmanesh, I. S.
    KTH, School of Biotechnology (BIO). KTH, School of Engineering Sciences (SCI), Applied Physics.
    Grishenkov, Dmitry
    KTH, School of Technology and Health (STH), Medical Engineering, Medical Imaging.
    Wiklund, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Microbubble assisted cell sorting by acoustophoresis2016In: 20th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2016, Chemical and Biological Microsystems Society , 2016, p. 1677-1678Conference paper (Refereed)
    Abstract [en]

    Polymer shelled gas microbubbles (MBs) are used to sort cells in a microfluidic chip under acoustic standing waves (SW). When particles are subjected to SW based on their acoustic contrast factor (ACF) they migrate to nodes (positive contrast factor particles; PACP) or antinodes (negative acoustic contrast particles; NACP)[1]. We have bounded functionalized MBs with cells such that, they can be selectively migrated to antinodes under SW and sorted from unbounded cell both in no flow and flow conditions. Here we demonstrate acoustic mediated microbubble tagged cell sorting with 75% efficiency.

  • 22.
    Faridi, Muhammad Asim
    et al.
    KTH. mafaridi@kth.se.
    Iranmanesh, Ida Sadat
    KTH.
    Ramachandraiah, Harisha
    Vanderleyden, Els
    Dubruel, Peter
    Wiklund, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Glass Capillary based cavity resonator for particle trapping study and bacteria up-concentrationIn: Biomedical microdevices (Print), ISSN 1387-2176, E-ISSN 1572-8781Article in journal (Refereed)
    Abstract [en]

    We have performed particle aggregation characterization on the basis of their material and suspending

    medium in a capillary-based cavity resonator used for acoustophoresis. We have investigated the experimental

    aggregation time of 5μm polystyrene and silica particles, size of aggregate, number of trapped particles and upconcentration

    factor in water, 0.01M phosphate buffered saline (PBS) and 0.005M PBS at 1.97MHz and with

    actuation voltages between 4, 8 and 12Vpp. We have found that there is little difference between using water and

    PBS as suspension medium, approximately 5-10% longer trapping times with PBS compared with water.

    However we get approx. 5.5 times faster trapping time for silica than for polystyrene. It is also observed and

    calculated that silica particle aggregates have 3.4 times larger area than the polystyrene aggregates using the same

    starting particle concentrations, revealing similar amount of difference in trapped number of particles. The upconcentration

    factor for silica is also about 3.2 times higher than that of polystyrene due to larger aggregate area

    of silica particles. Based on theoretical predictions and experimental characterization of the particle aggregation

    pattern, we note that the particle-particle interaction force contribution to the total acoustic radiation force is more

    pronounced for silica than for polystyrene. Finally as a proof of principle for biomedical sample preparation

    application we demonstrate the capillary-based silica particles mediated bacteria acoustophoretic upconcentration.

    This setup could potentially be utilized not only for sample preparation application but also for

    bead based affinity immunoassays.

  • 23.
    Faridi, Muhammad Asim
    et al.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Ardabili, Sahar
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Zelenin, Sergey
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Elasto-Inertial microfluidics for bacteria separation from whole blood for sepsis diagnosticsManuscript (preprint) (Other academic)
  • 24.
    Faridi, Muhammad Asim
    et al.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab. mafaridi@kth.se.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Banerjee, Indradumna
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Ardabli, Sahar
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Zelenin, Sergey
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Elasto-inertial microfluidics for bacteria separation from whole blood for sepsis diagnostics2017In: Journal of Nanobiotechnology, ISSN 1477-3155, E-ISSN 1477-3155, Vol. 15, article id 3Article in journal (Refereed)
    Abstract [en]

    Background: Bloodstream infections (BSI) remain a major challenge with high mortality rate, with an incidence that is increasing worldwide. Early treatment with appropriate therapy can reduce BSI-related morbidity and mortality. However, despite recent progress in molecular based assays, complex sample preparation steps have become critical roadblock for a greater expansion of molecular assays. Here, we report a size based, label-free, bacteria separation from whole blood using elasto-inertial microfluidics.

    Results: In elasto-inertial microfluidics, the viscoelastic flow enables size based migration of blood cells into a non- Newtonian solution, while smaller bacteria remain in the streamline of the blood sample entrance and can be sepa- rated. We first optimized the flow conditions using particles, and show continuous separation of 5 μm particles from 2 μm at a yield of 95% for 5 μm particle and 93% for 2 μm particles at respective outlets. Next, bacteria were continu- ously separated at an efficiency of 76% from undiluted whole blood sample.

    Conclusion: We demonstrate separation of bacteria from undiluted while blood using elasto-inertial microfluidics. The label-free, passive bacteria preparation method has a great potential for downstream phenotypic and molecular analysis of bacteria. 

  • 25.
    Faridi, Muhammad Asim
    et al.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab. mafaridi@kth.se.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Iranmanesh, Ida Sadat
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Grishenkov, Dmitry
    KTH, School of Technology and Health (STH), Medical Engineering, Medical Imaging.
    Wiklund, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    MicroBubble Activated Acoustic Cell Sorting: BAACSIn: Biomedical microdevices (Print), ISSN 1387-2176, E-ISSN 1572-8781Article in journal (Refereed)
    Abstract [en]

    Acoustophoresis, the ability to acoustically manipulate particles and cells inside a microfluidic channel, is a critical enabling technology for cell-sorting applications. However, one of the major impediments for routine use of acoustophoresis at clinical laboratory has been the reliance on the inherent physical properties of cells for separation. Here, we present a microfluidic-based microBubble-Activated Acoustic Cell Sorting (BAACS) method that rely on the specific binding of target cells to microbubbles conjugated with specific antibodies on their surface for continuous cell separation using ultrasonic standing wave. In acoustophoresis, cells being positive acoustic contrast particles migrate to pressure nodes. On the contrary we show that air-filled polymer-shelled microbubbles being strong negative acoustic contrast particles migrate to pressure antinodes at acoustic pressure amplitudes as low as 60 kPa. As a proof of principle, using the BAACS strategy, we demonstrate the separation of cancer cell line in a suspension with better than 75% efficiency. Moreover, 100% of the microbubble-cell conjugates migrated to the anti-node. Hence a better upstream affinity-capture has the potential to provide higher sorting efficiency. The BAACS technique may potentially provide a simplistic approach for similar sized selective isolation of cells, and is suited for applications in point of care.

  • 26.
    Faridi, Muhammad Asim
    et al.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab. mafaridi@kth.se.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Iranmanesh, Ida Sadat
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Grishenkov, Dmitry
    KTH, School of Technology and Health (STH), Medical Engineering, Medical Imaging.
    Wiklund, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    MicroBubble Activated Acoustic Cell Sorting: BAACS2017In: Biomedical microdevices (Print), ISSN 1387-2176, E-ISSN 1572-8781, Vol. 19, no 2, article id 23Article in journal (Refereed)
    Abstract [en]

    Acoustophoresis, the ability to acoustically manipulate particles and cells inside a microfluidic channel, is a critical enabling technology for cell-sorting applications. However, one of the major impediments for routine use of acoustophoresis at clinical laboratory has been the reliance on the inherent physical properties of cells for separation. Here, we present a microfluidic-based microBubble-Activated Acoustic Cell Sorting (BAACS) method that rely on the specific binding of target cells to microbubbles conjugated with specific antibodies on their surface for continuous cell separation using ultrasonic standing wave. In acoustophoresis, cells being positive acoustic contrast particles migrate to pressure nodes. On the contrary we show that air-filled polymer-shelled microbubbles being strong negative acoustic contrast particles migrate to pressure antinodes at acoustic pressure amplitudes as low as 60 kPa. As a proof of principle, using the BAACS strategy, we demonstrate the separation of cancer cell line in a suspension with better than 75% efficiency. Moreover, 100% of the microbubble-cell conjugates migrated to the anti-node. Hence a better upstream affinity-capture has the potential to provide higher sorting efficiency. The BAACS technique may potentially provide a simplistic approach for similar sized selective isolation of cells, and is suited for applications in point of care.

  • 27.
    Faridi, Muhammad Asim
    et al.
    KTH.
    Shahzad, Adnan Faqui
    KTH.
    Russom, Aman
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Nano Biotechnology.
    Wiklund, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
    Milliliter scale acoustophoresis based bioparticle processing platform2018In: ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM 2018, ASME Press, 2018Conference paper (Refereed)
    Abstract [en]

    Bioparticles such as mammalian cells and bacteria can be manipulated directly or indirectly for multiple applications such as sample preparation for diagnostic applications mainly up-concentration, enrichment & separation as well as immunoassay development. There are various active and passive microfluidic particle manipulation techniques where Acoustophoresis is a powerful technique showing high cell viability. The use of disposable glass capillaries for acoustophoresis, instead of cleanroom fabricated glass-silicon chip can potentially bring down the cost factor substantially, aiding the realization of this technique for real-world diagnostic devices. Unlike available chips and capillary-based microfluidic devices, we report milliliter-scale platform able to accommodate 1ml of a sample for acoustophoresis based processing on a market available glass capillary. Although it is presented as a generic platform but as a demonstration we have shown that polystyrene suspending medium sample can be processed with trapping efficiency of 87% and the up-concentration factor of 10 times in a flow through manner i.e., at 35µl/min. For stationary volume accommodation, this platform practically offers 50 times more sample handling capacity than most of the microfluidic setups. Furthermore, we have also shown that with diluted blood (0.6%) in a flow-through manner, 82% of the white blood cells (WBCs) per ml could be kept trapped. This milliliter platform could potentially be utilized for assisting in sample preparation, plasma separation as well as a flow-through immunoassay assay development for clinical diagnostic applications.

  • 28.
    Hansson, Jonas
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Karlsson, J. Mikael
    KTH, School of Electrical Engineering (EES), Micro and Nanosystems.
    Haraldsson, Tommy
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Wijngaart, Wouter van der
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Russom, Aman
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Inertial Particle Focusing In Parallel Microfluidic Channels For High-Throughput Filtration2011In: 16th International  Solid-State Sensors, Actuators and Microsystems Conference (TRANSDUCERS), 2011, IEEE conference proceedings, 2011, p. 1777-1780Conference paper (Refereed)
    Abstract [en]

    In this study, we introduce inertial microfluidics in straight, parallel channels for high-throughput particle filtration. We show that particles flowing through low aspect ratio rectangular microchannels can be focused into four particle streams, distributed at the centers of each wall face, or into two particle streams, at the centers of the longest channel walls, depending on the particles' size. For high-throughput filtration, we fabricated scalable, single inlet and two outlet, parallel channel microdevices, using a high-density 3D microfluidic PDMS channel manufacturing technology, in a design that allows for easy integration with other downstream on-chip functions we recently described. We demonstrate filtration of 24 μm particles from a suspension mixture in a microdevice with four parallel channels. The filtration efficiency at a non-optimized flow rate of 0.8 ml/min was 82%.

  • 29.
    Hansson, Jonas
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics. KTH, School of Biotechnology (BIO), Nano Biotechnology (closed 20130101).
    Karlsson, Mikael J.
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Haraldsson, Tommy
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Brismar, Hjalmar
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    van der Wijngaart, Wouter
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Russom, Aman
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics. KTH, School of Biotechnology (BIO), Nano Biotechnology (closed 20130101).
    Inertial microfluidics in parallel channels for high-throughput applications2012In: Lab on a Chip, ISSN 1473-0197, E-ISSN 1473-0189, Vol. 12, no 22, p. 4644-4650Article in journal (Refereed)
    Abstract [en]

    Passive particle focusing based on inertial microfluidics was recently introduced as a high-throughput alternative to active focusing methods that require an external force-field to manipulate particles. In this study, we introduce inertial microfluidics in flows through straight, multiple parallel channels. The scalable, single inlet and two outlet, parallel channel system is enabled by a novel, high-density 3D PDMS microchannel manufacturing technology, mediated via a targeted inhibition of PDMS polymerization. Using single channels, we first demonstrate how randomly distributed particles can be focused into the centre position of the channel in flows through low aspect ratio channels and can be effectively fractionated. As a proof of principle, continuous focusing and filtration of 10 μm particles from a suspension mixture using 4- and 16-parallel-channel devices with a single inlet and two outlets are demonstrated. A filtration efficiency of 95-97% was achieved at throughputs several orders of magnitude higher than previously shown for flows through straight channels. The scalable and low-footprint focusing device requiring neither external force fields nor mechanical parts to operate is readily applicable for high-throughput focusing and filtration applications as a stand-alone device or integrated with lab-on-a-chip systems.

  • 30.
    Hill, Daniel
    et al.
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Sandström, Niklas
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Gylfason, Kristinn
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Carlborg, Fredrik
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Karlsson, J. Mikael
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Haraldsson, Tommy
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Sohlström, Hans B.
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Russom, Aman
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Stemme, Göran
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Claes, T.
    Bienstman, P.
    Kazmierczak, A.
    Dortu, F.
    Banuls Polo, M. J.
    Maquieira, A.
    Kresbach, G. M.
    Vivien, L.
    Popplewell, J.
    Ronan, G.
    Barrios, C. A.
    van der Wijngaart, Wouter
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Microfluidic and Transducer Technologies for Lab on a Chip Applications2010In: 2010 ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC), IEEE conference proceedings, 2010, p. 305-307Conference paper (Refereed)
    Abstract [en]

    Point-of-care diagnostic devices typically require six distinct qualities: they must deliver at least the same sensitivity and selectivity, and for a cost per assay no greater than that of today's central lab technologies, deliver results in a short period of time (<15 min at GP; <2h in hospital), be portable or at least small in scale, and require no or extremely little sample preparation. State-of-the-art devices deliver information of several markers in the same measurement.

  • 31.
    Iranmanesh, Ida
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Ohlin, Mathias
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Wiklund, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Acoustic micro-vortexing of fluids, beads and cells in disposible microfluidic chips2015In: MicroTAS 2015 - 19th International Conference on Miniaturized Systems for Chemistry and Life Sciences, Chemical and Biological Microsystems Society , 2015, p. 1005-1007Conference paper (Refereed)
    Abstract [en]

    In this paper we demonstrate a multi-functional platform using ultrasound for vortexing of 20-μl volumes of different samples in polymer-based disposable chips. The method enables different vortexing functions such as mixing laminar flows, resuspension of a micro-pellet of magnetic beads as well as cell lysis for DNA extraction. The device consists of an inexpensive low-frequency, high power, horn-shaped langevin transducer which is typically used for cell disruption in larger volumes. By controlling the operating time of this device (from fractions of a second up to a minute) different functions can be achieved. In addition, to avoid the high-power-induced heating, a simple cooling system is used as a chip holder consisting of a PC fan-cooled aluminum heat sink. To demonstrate a sample preparation application, we perform on-chip cell lysis and DNA extraction.

  • 32.
    Iranmanesh, Ida
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Ohlin, Mathias
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Ye, Simon
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Wiklund, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
    Acoustic micro-vortexing of fluids, particles and cells in disposable microfluidic chips2016In: Biomedical microdevices (Print), ISSN 1387-2176, E-ISSN 1572-8781, Vol. 18, no 4, article id 71Article in journal (Refereed)
    Abstract [en]

    We demonstrate an acoustic platform for microvortexing in disposable polymer microfluidic chips with small-volume (20 mu l) reaction chambers. The described method is demonstrated for a variety of standard vortexing functions, including mixing of fluids, re-suspension of a pellet of magnetic beads collected by a magnet placed on the chip, and lysis of cells for DNA extraction. The device is based on a modified Langevin-type ultrasonic transducer with an exponential horn for efficient coupling into the microfluidic chip, which is actuated by a low-cost fixed-frequency electronic driver board. The transducer is optimized by numerical modelling, and different demonstrated vortexing functions are realized by actuating the transducer for varying times; from fractions of a second for fluid mixing, to half a minute for cell lysis and DNA extraction. The platform can be operated during 1 min below physiological temperatures with the help of a PC fan, a Peltier element and an aluminum heat sink acting as the chip holder. As a proof of principle for sample preparation applications, we demonstrate on-chip cell lysis and DNA extraction within 25 s. The method is of interest for automating and chip-integrating sample preparation procedures in various biological assays.

  • 33.
    Iranmanesh, Ida Sadat
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
    Ohlin, Mathias
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Wiklund, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
    Acoustic micro-vortexing of fluids, beads and cells in disposable microfluidic chipsManuscript (preprint) (Other academic)
  • 34.
    Iranmanesh, Ida Sadat
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Wiklund, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    On-chip ultrasonic sample preparation for cell based assays2015In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 5, no 91, p. 74304-74311Article in journal (Refereed)
    Abstract [en]

    We demonstrate an acoustophoresis method for size-based separation, isolation, up-concentration and trapping of cells that can be used for on-chip sample preparation combined with high resolution imaging for cell-based assays. The method combines three frequency-specific acoustophoresis functions in a sequence by actuating three separate channel zones simultaneously: zones for pre-alignment, size-based separation, and trapping. We characterize the mutual interference between the acoustic radiation forces between the different zones by measuring the spatial distribution of the acoustic energy density during different schemes of ultrasonic actuation, and use this information for optimizing the driving frequencies and voltages of the three utilized ultrasonic transducers attached to the chip, and the flow rates of the pumps. By the use of hydrodynamic defocusing of the pre-aligned cells in the separation zone, a cell population from a complex sample can be isolated and trapped with very high purity, followed by dynamic fluorescence analysis. We exemplify the method's potential by isolating A549 lung cancer cells from red blood cells with 100% purity, 92% separation efficiency, and 93% trapping efficiency resulting in a 130× up-concentration factor during 15 minutes of continuous sample processing through the chip. Furthermore, we demonstrate an on-chip fluorescence assay of the isolated cancer cells by monitoring the dynamic uptake and release of a fluorescence probe in individual trapped cells. The ability to combine isolation of individual cells from a complex sample with high-resolution image analysis holds great promise for applications in cellular and molecular diagnostics.

  • 35. Irimia, Daniel
    et al.
    Mindrinos, Michael
    Russom, Aman
    Harvard Univ, Sch Med, Boston ; Massachusetts Gen Hosp, Shriners Hosp Children.
    Xiao, Wenzhong
    Wilhelmy, Julie
    Wang, Shenglong
    Heath, Joe Don
    Kurn, Nurith
    Tompkins, Ronald G.
    Davis, Ronald W.
    Toner, Mehmet
    Genome-wide transcriptome analysis of 150 cell samples2009In: Integrative Biology, ISSN 1757-9694, E-ISSN 1757-9708, Vol. 1, no 1, p. 99-107Article in journal (Refereed)
    Abstract [en]

     major challenge in molecular biology is interrogating the human transcriptome on a genome wide scale when only a limited amount of biological sample is available for analysis. Current methodologies using microarray technologies for simultaneously monitoring mRNA transcription levels, require nanogram amounts of total RNA. To overcome the sample size limitation of Current technologies, we have developed a method to probe the global gene expression ill biological samples as small as 150 cells, or the equivalent of approximately 300 pg total RNA. The new method employs microfluidic devices for the purification of total RNA from mammalian cells and ultra-sensitive whole transcriptome amplification techniques. We verified that the RNA integrity is preserved through the isolation process, accomplished highly reproducible whole transcriptome analysis, and established high correlation between repeated isolations of 150 cells and the same cell culture sample. We validated the technology by demonstrating that the combined microfluidic and amplification protocol is capable of identifying biological pathways perturbed by Stimulation, which are consistent with the information recognized in bulk-isolated samples.

  • 36.
    Karlsson, J. Mikael
    et al.
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Haraldsson, Tommy
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Carlborg, Carl Fredrik
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Hansson, Jonas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Nano Biotechnology (closed 20130101).
    van der Wijngaart, Wouter
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Fabrication and transfer of fragile 3D PDMS microstructures2012In: Journal of Micromechanics and Microengineering, ISSN 0960-1317, E-ISSN 1361-6439, Vol. 22, no 8, p. 1-9Article in journal (Refereed)
    Abstract [en]

    We present a method for PDMS microfabrication of fragile membranes and 3D fluidic networks, using a surface modified water-dissolvable release material, poly(vinyl alcohol), as a tool for handling, transfer and release of fragile polymer microstructures. The method is well suited for the fabrication of complex multilayer microfluidic devices, here shown for a PDMS device with a thin gas permeable membrane and closely spaced holes for vertical interlayer connections fabricated in a single layer. To the authors knowledge, this constitutes the most advanced PDMS fabrication method for the combination of thin, fragile structures and 3D fluidics networks, and hence a considerable step in the direction of making PDMS fabrication of complex microfluidic devices a routine endeavour.

  • 37.
    Karlsson, J. Mikael
    et al.
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Haraldsson, Tommy
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Sandström, Niklas
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Stemme, Göran
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Russom, Aman
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Wijngaart, Wouter van der
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    On-Chip Liquid Degassing With Low Water Loss2010In: Proceedings Micro Total Analysis Systems (μTAS) 2010, Groningen: CBMS , 2010, p. 1790-1792Conference paper (Refereed)
    Abstract [en]

    We present a novel approach for actively degassing liquid and removing trapped air bubbles in microfluidic devices.

    In our approach, an integrated gas permeable membrane, consisting of a structurally supporting PDMS layer that is covered with a thin Teflon® AF 1600 film, separates the on-chip liquid from an on-chip low-vacuum chamber. Since the Teflon AF permeability is near zero for liquid water and low for vapour, air bubbles and dissolved air are removed through the membrane whilst the loss of water, ions and biomolecules in the system remains low. The system has been demonstrated at elevated temperatures and could be suitable for e.g. degassing during on-chip PCR.

  • 38.
    Kazemzadeh, Amin
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Nano Biotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Eriksson, Anders
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Madou, Marc
    Univ Calif Irvine, Dept Mech & Aerosp Engn, Irvine, CA 92697 USA..
    Russom, Aman
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Nano Biotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    A micro-dispenser for long-term storage and controlled release of liquids2019In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, no 1, article id 189Article in journal (Refereed)
    Abstract [en]

    The success of lab-on-a-chip systems may depend on a low-cost device that incorporates on-chip storage and fluidic operations. To date many different methods have been developed that cope separately with on-chip storage and fluidic operations e. g., hydrophobic and capillary valves pneumatic pumping and blister storage packages. The blister packages seem difficult to miniaturize and none of the existing liquid handling techniques despite their variety are capable of proportional repeatable dispensing. We report here on an inexpensive robust and scalable micro-dispenser that incorporates long-term storage and aliquoting of reagents on different microfluidics platforms. It provides long-term shelf-life for different liquids enables precise dispensing on lab-on-a-disc platforms and less accurate but proportional dispensing when operated by finger pressure. Based on this technology we introduce a method for automation of blood plasma separation and multi-step bioassay procedures. This micro-dispenser intends to facilitate affordable portable diagnostic devices and accelerate the commercialization of lab-on-a-chip devices.

  • 39. Kotz, Kenneth T.
    et al.
    Russom, Aman
    Irimia, Daniel
    Mindrinos, Michael
    Moldawer, Lyle L.
    Tompkins, Ronald G.
    Toner, Mehmet
    ANYL 403-Microfluidic immunoaffinity capture cassette for rapid isolation and processing of neutrophils from whole blood2007In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 234Article in journal (Other academic)
  • 40. Kotz, Kenneth T.
    et al.
    Xiao, Wenzong
    Miller-Graziano, Carol
    Qian, Wei-Jun
    Russom, Aman
    Warner, Elizabeth A.
    Moldawer, Lyle L.
    De, Asit
    Bankey, Paul E.
    Petritis, Brianne O.
    Camp, David G., II
    Rosenbach, Alan E.
    Goverman, Jeremy
    Fagan, Shawn P.
    Brownstein, Bernard H.
    Irimia, Daniel
    Xu, Weihong
    Wilhelmy, Julie
    Mindrinos, Michael N.
    Smith, Richard D.
    Davis, Ronald W.
    Tompkins, Ronald G.
    Toner, Mehmet
    Clinical microfluidics for neutrophil genomics and proteomics2010In: Nature Medicine, ISSN 1078-8956, E-ISSN 1546-170X, Vol. 16, no 9, p. 1042-U142Article in journal (Refereed)
    Abstract [en]

    Neutrophils have key roles in modulating the immune response. We present a robust methodology for rapidly isolating neutrophils directly from whole blood with 'on-chip' processing for mRNA and protein isolation for genomics and proteomics. We validate this device with an ex vivo stimulation experiment and by comparison with standard bulk isolation methodologies. Last, we implement this tool as part of a near-patient blood processing system within a multi-center clinical study of the immune response to severe trauma and burn injury. The preliminary results from a small cohort of subjects in our study and healthy controls show a unique time-dependent gene expression pattern clearly demonstrating the ability of this tool to discriminate temporal transcriptional events of neutrophils within a clinical setting.

  • 41.
    Lashgari, Iman
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics.
    Niazi Ardekani, Mehdi
    KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
    Banerjee, Indradumna
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Brandt, Luca
    KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
    Inertial migration of spherical and oblate particles in straight ductsIn: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645Article in journal (Refereed)
    Abstract [en]

    We study numerically the inertial migration of a single rigid sphere and an oblate spheroid in straight square and rectangular ducts. A highly accurate interface-resolved numerical algorithm is employed to analyse the entire migration dynamics of the oblate particle and compare it with that of the sphere. Similarly to the inertial focusing of spheres, the oblate particle reaches one of the four face-centred equilibrium positions, however they are vertically aligned with the axis of symmetry in the spanwise direction. In addition, the lateral trajectories of spheres and oblates collapse into an equilibrium manifold before ending at the equilibrium positions, with the equilibrium manifold tangential to lines of constant background shear for both sphere and oblate particles. The differences between the migration of the oblate and sphere are also presented, in particular the oblate may focus on the diagonal symmetry line of the duct cross-section, close to one of the corners, if its diameter is larger than a certain threshold. Moreover, we show that the final orientation and rotation of the oblate exhibit a chaotic behaviour for Reynolds numbers beyond a critical value. Finally, we document that the lateral motion of the oblate particle is less uniform than that of the spherical particle due to its evident tumbling motion throughout the migration. In a square duct, the strong tumbling motion of the oblate in the first stage of the migration results in a lower lateral velocity and consequently longer focusing length with respect to that of the spherical particle. The opposite is true in a rectangular duct where the higher lateral velocity of the oblate in the second stage of the migration, with negligible tumbling, gives rise to shorter focusing lengths.These results can help the design of microfluidic systems for bio-applications.

  • 42.
    Lundgren, Stina
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Russom, Aman
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Jönsson, Christina
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Stemme, Göran
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Haswell, Stephen J.
    Andersson, Helene
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Moberg, Christina
    KTH, School of Electrical Engineering (EES), Microsystem Technology (Changed name 20121201).
    Micro reactors for the optimisation of reaction conditions in asymmetric metal catalysis2005In: Micro Total Analysis Systems 2004 / [ed] Laurell T; Nilsson J; Jensen K; Harrison DJ; Kutter JP, 2005, no 296, p. 445-447Conference paper (Refereed)
    Abstract [en]

    Two types of micro reactors were employed for enantioselective metal catalysed reactions. In the first type of reactor, an electroosmotic flow was used, whereas the second type of reactor used a pressure driven flow. The purpose of the study is to develop tools for rapid and efficient optimization of reactions, utilising minimum amounts of reagents.

  • 43. Ohlander, A.
    et al.
    Bauer, S.
    Ramachandraiah, Harisha
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Bock, K.
    Foil-based DNA melting curve analysis platform for low-cost point-of-care molecular diagnostics2013In: 17th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2013, 2013, Vol. 3, p. 1770-1772Conference paper (Refereed)
    Abstract [en]

    We report on genotyping of single nucleotide polymorphisms (SNP) by melting curve analysis (MCA) on DNA microarrays in a plastic microfluidic system with integrated heaters using lamination foils. Thin-film micro-heaters were processed on polyethylene napthalate (PEN) foil in only one metallization step. DNA microarrays were prepared directly on the PEN surface without the need of surface pre-treatment via UV-mediated immobilization of the spotted DNA microarrays. MCA in microfluidic channels is demonstrated at a ramping rate of 60°C/min, enabling ultra-rapid (50 seconds) SNP analysis.

  • 44. Ohlander, A.
    et al.
    Ganka, Th.
    Binder, T.
    Wiest, F.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Bock, K.
    Real-time monitoring of melting curves on DNA microarrays in plastic lab-on-foil system using silicon photomultiplier detectors2014In: 18th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2014, Chemical and Biological Microsystems Society , 2014, p. 2294-2296Conference paper (Refereed)
    Abstract [en]

    We report on DNA genotyping by melting curve analysis (MCA) in a plastic foil-microfluidic system using silicon photomultiplier (SiPM) detectors. Matching and single base mismatching DNA oligonucleotides were immobilized on thin-film foil microheaters and integrated in microfluidic channels using lamination foils. Two SiPMs, each with a sensitive area of 1.2×1.2 mm were assembled in an optical measurement setup to monitor the decaying Cy3 fluorescence intensity of the hybridized DNA spots upon melting. Successful detection of single nucleotide polymorphisms (SNP) is demonstrated.

  • 45. Ohlander, A.
    et al.
    Hammerle, T.
    Klink, G.
    Zilio, C.
    Damin, F.
    Chiari, M.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Bock, K.
    DNA melting curve analysis on semi-transparent thin film microheater on flexible lab-on-foil substrate2012In: Proceedings of the 16th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2012, 2012, p. 797-799Conference paper (Refereed)
    Abstract [en]

    This paper presents genotyping on a novel microheater concept using semi-transparent copper microheaters manufactured by roll-to-roll and lift-off on polyethylene napthalate (PEN) foil. Using a mesh structure, heater surfaces have been realized in one single metallization step with a manufacturing robustness higher than conventional meander structures. The thermal distribution of the meshes, evaluated using thermochromic-liquid-crystals (TLC), produced more homogenous heating characteristics compared to meanders. Parylene coated heaters were functionalized using copolymer poly(DMA-NAS-MAPS) to enable covalent DNA immobilization and successful melting curve analysis was performed differentiating between match and mismatch oligonucleotides.

  • 46.
    Ohlander, Anna
    et al.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Bose, Indranil
    Njenda, Duncan
    Zelenin, Sergey
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Neogi, Ujjwal
    Kutter, Christoph
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Lab-on-foil based portable microPCR for point-of-care nucleic acid testing of HIV-1Manuscript (preprint) (Other academic)
  • 47.
    Ohlander, Anna
    et al.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Zelenin, Sergey
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Huygens, Flavia
    Kutter, Christoph
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Staphylococcus Aureus subtyping and detection of MRSA on a microfluidic lab-on-Foil deviceManuscript (preprint) (Other academic)
  • 48. Ohlander, Anna
    et al.
    Zilio, Caterina
    Hammerle, Tobias
    Zelenin, Sergey
    KTH, School of Biotechnology (BIO), Proteomics (closed 20130101). KTH, School of Biotechnology (BIO), Nano Biotechnology (closed 20130101). KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Klink, Gerhard
    Chiari, Marcella
    Bock, Karlheinz
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics (closed 20130101). KTH, School of Biotechnology (BIO), Nano Biotechnology (closed 20130101). KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Genotyping of single nucleotide polymorphisms by melting curve analysis using thin film semi-transparent heaters integrated in a lab-on-foil system2013In: Lab on a Chip, ISSN 1473-0197, E-ISSN 1473-0189, Vol. 13, no 11, p. 2075-2082Article in journal (Refereed)
    Abstract [en]

    The recent technological advances in micro/nanotechnology present new opportunities to combine microfluidics with microarray technology for the development of small, sensitive, single-use, point-of-care molecular diagnostic devices. As such, the integration of microarray and plastic microfluidic systems is an attractive low-cost alternative to glass based microarray systems. This paper presents the integration of a DNA microarray and an all-polymer microfluidic foil system with integrated thin film heaters, which demonstrate DNA analysis based on melting curve analysis (MCA). A novel micro-heater concept using semi-transparent copper heaters manufactured by roll-to-roll and lift-off on polyethylene naphthalate (PEN) foil has been developed. Using a mesh structure, heater surfaces have been realized in only one single metallization step, providing more efficient and homogenous heating characteristics than conventional meander heaters. A robust DNA microarray spotting protocol was adapted on Parylene C coated heater-foils, using co-polymer poly(DMA-NAS-MAPS) to enable covalent immobilization of DNA. The heaters were integrated in a microfluidic channel using lamination foils and MCA of the spotted DNA duplexes showed single based discrimination of mismatched over matched target DNA-probes. Finally, as a proof of principle, we perform MCA on PCR products to detect the Leu7Pro polymorphism of the neutropeptide Y related to increased risk of Type II diabetes, BMI and depression.

  • 49. Pavankumar, A. R.
    et al.
    Zelenin, Sergey
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Lundin, A.
    Schulte, T.
    Rajarathinam, K.
    Rebellato, P.
    Ardabili, Sahar
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Salas, J.
    Achour, A.
    Russom, Aman
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Bioanalytical advantages of a novel recombinant apyrase enzyme in ATP-based bioluminescence methods2018In: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 1025, p. 118-123Article in journal (Refereed)
    Abstract [en]

    Ultrasensitive measurements of intracellular ATP (intATP) based on the firefly luciferase reactions are frequently used to enumerate bacterial or mammalian cells. During clinical applications, extracellular ATP (extATP) should be depleted in biological samples since it interferes with intATP and affects the quantification of bacteria. The extATP can be eliminated by ATP-degrading enzymes but complete hydrolysis of extATP remains a challenge for today's commercial enzymes. The catalytic efficiency of ATP-degrading enzymes depends on enzyme characteristics, sample composition and the ability to deplete diphosphates, triphosphates and their complexes generated during the reaction. This phenomenon restricts the usage of bioluminescence-based ATP methods in clinical diagnostics. In light of this, we have developed a recombinant Shigella flexneri apyrase (RSFA) enzyme and analysed its ATP depletion potential with five commercial biochemical sources including potato apyrase, acid phosphatase, alkaline phosphatase, hexokinase and glycerol kinase. The RSFA revealed superior activity by completely eliminating the extracellular ATP and ATP-complexes, even in biological samples like urine and serum. Therefore, our results can potentially unwrap the chemical and bio-analytical applications of ATP-based bioluminescence tests to develop highly sensitive point-of-care diagnostics.

  • 50. Pavankumar, A.M.
    et al.
    Ardabili, Sahar
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Zelenin, Sergey
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Shulte, T.
    Lundin, A.
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology.
    Russom, Aman
    KTH, School of Biotechnology (BIO), Proteomics and Nanobiotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Recombinant Shigella flexneri apyrase enzyme for bioluminescence based diagnostic applicationsManuscript (preprint) (Other academic)
12 1 - 50 of 92
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