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Characterization and emulsifying property of a carbohydrate polymer produced by Bacillus pumilus UW02 isolated from waste water irrigated agricultural soil

Characterization and emulsifying property of a carbohydrate polymer produced by Bacillus pumilus UW02 isolated from waste water irrigated agricultural

Characterization and emulsifying property of a carbohydrate polymer produced by Bacillus pumilus UW02 isolated from waste water irrigated agricultural soil  
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Bacillus pumilus UW-02, an isolate from agricultural soil irrigated with waste water was found to produce a carbohydrate polymer in the form of extracellular polysaccharide (EPS) in glucose mineral salts medium (GMSM). The recovery rates of EPS by ion-exchange and gel filtration chromatography were around 63% and 90%, respectively. As evident from HPLC and FT-IR analyses, the EPS was found to be a heteropolymer consisting glucose, mannose, xylose, arabinose, and N-acetyl glucosamine as monomer units. Different oligosaccharide combinations namely hexose4, hexose6 pentose1 and hexose10 pentose1 are obtained after partial hydrolysis of EPS using MALDI-ToF-MS. Electron micrographs portrayed the intense affinity of the EPS molecules for each other, thereby justifying its viscosifying and thickening properties. The EPS with an average molecular weight of 218kDa and thermal stability up to 180°C showed pseudoplastic rheology and significant emulsifying activities.
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