Demonstration of the cryoprotective properties of the fucose-containing polysaccharide FucoPol

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Abstract

We report the cryoprotective potential of FucoPol, a fucose-containing bacterial exopolysaccharide produced by Enterobacter A47. In vitro cryopreservation assays of Vero, Saos-2, HFFF2 and C2C12 cell lines exposed to a validated non-cytotoxic 2.5 mg/mL FucoPol concentration demonstrated a consistent post-thaw metabolic viability increase. Calorimetric analysis showed a non-colligative, FucoPol concentration-dependent increase of the freezing point (Tf), with minimal change in melting point (Tm). Freezing point variation was corroborated by Polarized Optical Microscopy studies, also showing a reduction of ice crystal dimensions. Its proven shear-thinning behaviour and polyanionicity favour interactivity between the polysaccharide and the water-ice interface, resulting in ice growth inhibition. These findings demonstrate FucoPol's high promise as a bio-based, biodegradable approach to be implemented into cryopreservation formulations.

Original languageEnglish
Article number116500
JournalCarbohydrate Polymers
Volume245
DOIs
Publication statusPublished - 1 Oct 2020

Keywords

  • Calorimetry
  • Cryopreservation
  • Cytotoxicity
  • FucoPol
  • Non-colligative
  • Polysaccharide

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