The effect of glass-forming sugars on vesicle morphology and water distribution during drying

C. J. Vogl*, M. J. Miksis, S. H. Davis, D. Salac

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Cryopreservation requires that stored materials be kept at extremely lowtemperatures and uses cryoprotectants that are toxic to cells at high concentrations. Lyopreservation is a potential alternative where stored materials can remain at room temperatures. That storage process involves desiccating cells filled with special glass-forming sugars. However, current desiccation techniques fail to produce viable cells, and researchers suspect that incomplete vitrification of the cells is to blame. To explore this hypothesis, a cell is modelled as a lipid vesicle to monitor the water content and membrane deformation during desiccation. The vesicle is represented as a moving, bending-resistant, inextensible interface and is tracked by a level set method. The vesicle is placed in a fluid containing a spatially varying sugar concentration field. The glassforming nature is modelled through a concentration-dependent diffusivity and viscosity. It is found that there are optimal regimes for the values of the osmotic flowparameter and of the concentration dependence of the diffusivity to limit water trapping in the vesicle. Furthermore, it is found that the concentration dependencies of the diffusivity and viscosity can have profound effects on membrane deformations, which may have significant implications for vesicle damage during the desiccation process..

Original languageEnglish (US)
Article number0646
JournalJournal of the Royal Society Interface
Volume11
Issue number99
DOIs
StatePublished - Oct 6 2014

Keywords

  • Concentration-dependent diffusivity
  • Concentrationdependent viscosity
  • Desiccation
  • Lipid vesicle
  • Lyopreservation
  • Osmotic flow

ASJC Scopus subject areas

  • Biotechnology
  • Biophysics
  • Bioengineering
  • Biomaterials
  • Biochemistry
  • Biomedical Engineering

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