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Bioinspired Layer-by-Layer Microcapsules Based on Cellulose Nanofibers with Switchable Permeability
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0002-0236-5420
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2017 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 18, no 4, p. 1401-1410Article in journal (Refereed) Published
Abstract [en]

Green, all-polysaccharide based microcapsules with mechanically robust capsule walls and fast, stimuli-triggered, and switchable permeability behavior show great promise in applications based on selective and timed permeability. Taking a cue from nature, the build-up and composition of plant primary cell walls inspired the capsule wall assembly, because the primary cell walls in plants exhibit high mechanical properties despite being in a highly hydrated state, primarily owing to cellulose microfibrils. The micro capsules (16 +/- 4 mu m in diameter) were fabricated using the layer-by-layer technique on sacrificial CaCO3 templates, using plant polysaccharides (pectin, cellulose nanofibers, and xyloglucan) only. In water, the capsule wall was permeable to labeled dextrans with a hydrodynamic diameter of similar to 6.6 nm. Upon exposure to NaC1, the porosity of the capsule wall quickly changed allowing larger molecules (similar to 12 nm) to permeate. However, the porosity could be restored to its original state by removal of NaCl, by which permeants became trapped inside the capsule's core. The high integrity of cell wall was due to the CNF and the ON/OFF alteration of the permeability properties, and subsequent loading/unloading of molecules, could be repeated several times with the same capsule demonstrating a robust microcontainer with controllable permeability properties.

Place, publisher, year, edition, pages
American Chemical Society (ACS) , 2017. Vol. 18, no 4, p. 1401-1410
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-207697DOI: 10.1021/acs.biomac.7b00126ISI: 000399061100036PubMedID: 28323423Scopus ID: 2-s2.0-85017647489OAI: oai:DiVA.org:kth-207697DiVA, id: diva2:1103806
Note

QC 20170531

Available from: 2017-05-31 Created: 2017-05-31 Last updated: 2022-10-18Bibliographically approved
In thesis
1. Plant cell-inspiredmicrocontainers: Fabrication, Characterization and Applications
Open this publication in new window or tab >>Plant cell-inspiredmicrocontainers: Fabrication, Characterization and Applications
2019 (English)Doctoral thesis, comprehensive summary (Other academic) [Artistic work]
Abstract [en]

Biomimetic materials have been inspiring mankind since a longtime for applications in a variety of fields. In particular, the production of lipidbasedvesicles have aided in our understanding of a variety of functions in animalcells, and also served as e.g. drug delivery systems and bioreactors. On thecontrary, the preparation of synthetic plant cells is limited, which is mainly due tothe challenges of building the complex plant primary cell wall fencing the lipidplasma membrane in real plant cells.The present thesis focuses on the bottom-up fabrication ofbiomimetic microcontainers that can serve as simple model systems for plant cells.In the first part, the interactions of plant cell wall polysaccharides, cellulosenanofibers (CNFs), pectin and xyloglucan, are examined. The knowledge is used inthe fabrication of microcapsules and the permeability properties were assessed.The results show that the polysaccharides must be assembled in a specific order inthe capsule wall to incorporate all the three polysaccharides. Additionally, thestructural stability and permeability highly depend on the capsule wallcomposition. The permeability also depends on the composition of thesurrounding media.The second part deals with the fabrication of more advancedbiomimetic microcapsules, with a lipid layer beneath the polysaccharide capsulewall. These capsules are semi-permeable and the phase behavior of the lipids isexploited to grow tubular structures (long filamentous structures) through thecapsule wall, as well as create a vesicle-crowded interior. Real plant cells usetubular structure (Plasmodesmata) for intercellular communications.In the third part, application-oriented aspects of the fabricatedmicrocapsules are discussed. The LbL-derived microcapsules (from the first part)were loaded with active glucose oxidase enzyme, thereby allowing their use as aglucose sensor. The capsule wall acts like a sieve, only allowing small molecules toeffectively pass through. Finally, cell culture experiments demonstrate theirbiocompatibility, paving way for tissue culture applications.

Abstract [sv]

Biomimetiska material har inspirerat mänskligheten sedan längeför applikationer inom olika områden. Framställningen av lipidbaserade vesiklarhar särskilt bidragit till vår förståelse av olika funktioner i djurceller samt tjänatsom t.ex. läkemedelsleveranssystem och bioreaktorer. Tvärtom är beredningen avsyntetiska växtceller begränsad, vilket främst beror på utmaningarna med attbygga och kombinera den komplexa primära cellvägg en med ett lipid-baseratplasmamembran.Denna avhandling fokuserar på ”bottom-up” tillverkning avbiomimetiska mikrobehållare som kan fungera som enkla modellsystem förväxtceller. I den första delen undersöks växelverkningarna mellanväxtcellväggspolysackariderna, cellulosa-nanofibrer (CNF), pektin och xyloglucan.Kunskapen används i nästa steg vid tillverkning av mikrokapslar. Resultaten visaratt, om man vill införliva alla tre polysackarider, måste de adsorberas i en specifikordning. Dessutom beror den strukturella stabiliteten och permeabiliteten hoskapselväggen på kapselväggkompositionen. Permeabiliteten beror också påsammansättningen hos den omgivande vätskan.Den andra delen behandlar tillverkning av mer avanceradebiomimetiska mikrokapslar, som innehåller ett lipidskikt underpolysackaridkapselväggen. Dessa kapslar är permeabla för vissa storlekar avmolekyler men inte andra. Lipidernas fasbeteende utnyttjas för att växa tubulärastrukturer (långa trådformade strukturer) genom kapselväggen, samt för att skapaen inre kapselmiljö som består av många små vesiklar. Växtceller i naturenanvänder rörformade strukturer (så kallade plasmodesmata) för att transporteramolekyler mellan närliggande celler.I den tredje delen diskuteras applikationsorienterade aspekter.Mikrokapslarna, som tillverkat med LbL-tekniken (från den första delen), kanladdas med ett glukosoxidas-enzym, varigenom de går att använda somglukossensor. Permeabilitetsegenskaperna hos kapselväggen tillåter bara att småmolekyler att passerar snabbt. Slutligen visar cellkultursexperiment att kapslarnaär biokompatibla, vilket banar väg för nya biomedicinska applikationer.

Place, publisher, year, edition, pages
Stockholm, Sweden: KTH Royal Institute of Technology, 2019. p. 66
Series
TRITA-CBH-FOU ; 52
National Category
Natural Sciences Plant Biotechnology Materials Engineering
Identifiers
urn:nbn:se:kth:diva-261587 (URN)978-91-7873-328-6 (ISBN)
Public defence
2019-11-04, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
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Note

QC 2019-10-08

Available from: 2019-10-08 Created: 2019-10-08 Last updated: 2022-06-26Bibliographically approved

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Riazanova, AnastasiaAndersson, Richard L.

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