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Label-Free Fluctuation Spectroscopy Based on Coherent Anti-Stokes Raman Scattering from Bulk Water Molecules
KTH, School of Engineering Sciences (SCI), Applied Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics. KTH, Centres, Science for Life Laboratory, SciLifeLab.ORCID iD: 0000-0002-1850-5440
KTH, School of Engineering Sciences (SCI), Applied Physics.
2016 (English)In: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 17, no 7, 1025-1033 p.Article in journal (Refereed) PublishedText
Abstract [en]

Nanoparticles (NPs) and molecules can be analyzed by inverse fluorescence correlation spectroscopy (iFCS) as they pass through an open detection volume, displacing fractions of the fluorescence-emitting solution in which they are dissolved. iFCS does not require the NPs or molecules to be labeled. However, fluorophores in m-mm concentrations are needed for the solution signal. Here, we instead use coherent anti-Stokes Raman scattering (CARS) from plain water molecules as the signal from the solution. By this fully label-free approach, termed inverse CARS-based correlation spectroscopy (iCARS-CS), NPs that are a few tenths of nm in diameter and at pM concentrations can be analyzed, and their absolute volumes/concentrations can be determined. Likewise, lipid vesicles can be analyzed as they diffuse/flow through the detection volume by using CARS fluctuations from the surrounding water molecules. iCARS-CS could likely offer a broadly applicable, label-free characterization technique of, for example, NPs, small lipid exosomes, or microparticles in biomolecular diagnostics and screening, and can also utilize CARS signals from biologically relevant media other than water.

Place, publisher, year, edition, pages
John Wiley & Sons, 2016. Vol. 17, no 7, 1025-1033 p.
Keyword [en]
CARS (coherent anti-Stokes Raman scattering), FCS (fluorescence correlationspectroscopy), label-free, microparticles, nanoparticles
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-185982DOI: 10.1002/cphc.201501129ISI: 000373738200012PubMedID: 26819085ScopusID: 2-s2.0-84958212840OAI: diva2:926957
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QC 20160510

Available from: 2016-05-10 Created: 2016-04-29 Last updated: 2016-05-17Bibliographically approved

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Sisamakis, EvangelosWennmalm, StefanWidengren, Jerker
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