Characterisation and bioactivity of sulphated exopolysaccharide produce by Halomonas titanicae PCRB123b from Antarctic Ocean

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This study investigates sulphated exopolysaccharide (EPS) produced by Halomonas titanicae PCRB123b, isolated from the polyextreme Antarctic Ocean. The EPS has molecular weight ∼1.48 × 104 Da. Surface topography revealed smooth, non-porous “weaving flasks” configuration. The CHNS data confirmed high carbon (21.41%) and sulphur (8.99%) content in EPS. Monosaccharide analysis bares a heteropolysaccharide configuration with mannose (82.9%), glucose (8.85%), and xylose (2.25%) etc. NMR and FTIR spectroscopy confirmed →4)-β-D-Manp-(1→ and →4)-β-D-Glcp-(1→ glycosidic linkages of mannose with glucose monomers, and xylose linked with mannose by →3)-β-D-xylp-(1→ glycosidic linkage. EPS was stable up-to >300 °C and exhibited a strong antioxidant activity against several free radicals. It has excellent emulsification properties for different food oils and strong flocculation bioactivity rate of 98.23% at 15 mg/L concentration, also 342.5% water and 185% of oil holding capacity. These findings suggest that PCRB123b EPS could be a beneficial addition to the food processing industry, potentially replacing synthetic polymers.

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