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Advisor(s)
Abstract(s)
Marine environments comprise almost three quarters of Earth’s surface, representing
the largest ecosystem of our planet. The vast ecological and metabolic diversity found in marine
microorganisms suggest that these marine resources have a huge potential as sources of novel
commercially appealing biomolecules, such as exopolysaccharides (EPS). Six Alteromonas strains from
different marine environments in French Polynesia atolls were selected for EPS extraction. All the EPS
were heteropolysaccharides composed of different monomers, including neutral monosaccharides
(glucose, galactose, and mannose, rhamnose and fucose), and uronic acids (glucuronic acid and
galacturonic acid), which accounted for up to 45.5 mol% of the EPS compositions. Non-carbohydrate
substituents, such as acetyl (0.5–2.1 wt%), pyruvyl (0.2–4.9 wt%), succinyl (1–1.8 wt%), and sulfate
(1.98–3.43 wt%); and few peptides (1.72–6.77 wt%) were also detected. Thermal analysis demonstrated
that the EPS had a degradation temperature above 260 C, and high char yields (32–53%). Studies
on EPS functional properties revealed that they produce viscous aqueous solutions with a shear
thinning behavior and could form strong gels in two distinct ways: by the addition of Fe2+, or in
the presence of Mg2+, Cu2+, or Ca2+ under alkaline conditions. Thus, these EPS could be versatile
materials for different applications
Description
Keywords
Alteromonas sp. exopolysaccharide characterization functional properties rheology gelation
Pedagogical Context
Citation
Concórdio-Reis, P.; Alves, V.D.; Moppert, X.; Guézennec, J.; Freitas, F.; Reis, M.A.M. Characterization and Biotechnological Potential of Extracellular Polysaccharides Synthesized by Alteromonas Strains Isolated from French Polynesia Marine Environments. Mar. Drugs 2021, 19, 522
Publisher
MDPI