Production of an exopolysaccharide by Antarctic yeast |
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Authors: | K. Pavlova I. Panchev M. Krachanova M. Gocheva |
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Affiliation: | (1) Laboratory of Applied Microbiology, Institute of Microbiology, Bulgarian Academy of Sciences, 26 Maritza Blvd., 4002 Plovdiv, Bulgaria;(2) University of Food Technologies, 26 Maritza Blvd., 4002 Plovdiv, Bulgaria;(3) Institute of Organic Chemistry with Phytochemistry Centre, Bulgarian Academy of Sciences, 95 V. Aprilov Blvd., P.O. Box 27, 4002 Plovdiv, Bulgaria |
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Abstract: | Psychrophilic Antarctic yeasts produce polysaccharides in different concentrations. According to morphological, cultural, physiological and biochemical characteristics, the best producer strain was identified as Cryptococcus flavus A51. The highest values for viscosity (59.1 mPa s) and crude polysaccharide productivity (5.75 g/L) were obtained in a medium containing 5 % sucrose and 0.25 % (NH4)2SO4, at 24 °C for 6 d. The chemical composition and sugar constituents of the crude exopolysaccharide were determined (92.5 % saccharides, 3.34 % protein, and 4.16 % ash). The monosaccharide composition of the exopolysaccharide obtained from C. flavus strain AL51 was established (55.1 % mannose, 26.1 % glucose, 9.60 % xylose, 1.90 % galactose). The microbial biopolymer has a high molar mass and homogeneity: 82 % of it had M 1.01 MDa. |
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