The red microalga Flintiella sanguinaria as a new exopolysaccharide producer
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Flintiella sanguinaria is a red unicellular microalgae belonging to Porphyridiophyceae with a high potential as an exopolysaccharide producer. A new culture medium was developed by a stoichiometry approach based on elemental analysis of microalgae, and culture conditions were improved after measurements of photosynthetic activity as a function of irradiance, temperature and pH. These optimal conditions were thus validated in a photobioreactor for the production of biomass and exopolysaccharide (EPS). After extraction and purification of the EPS, it was characterised by HPAEC-PAD, HPLC and FT-IR as a methylated and acetylated galactoxylan including a significant amount of rhamnose and glucuronic acid in its structure. Macromolecular conformation in dilute solution of native, deproteinised and desubstituted EPS from F. sanguinaria revealed that this polysaccharide had a strong associative behaviour in which hydrophobic interactions or hydrogen bonding but also proteins were implicated.
KeywordsFlintiella Rhodophyta Exopolysaccharide Culture Characterisation
This work was supported by the ANR POLYSALGUE project, grant ANR-15-CE21-0013 of the French Agence Nationale de la Recherche.
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