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Analysis of ${\beta}-(1{\to}3)(1{\to}6)-Glucan$ Produced by Aureobasidium pullulans IMS-822  

Lee, Seog-June (Bioindustry Research Center, Korea Research Institute of Bioscience and Biotechnology)
Ahn, Keug-Hyun (Bioindustry Research Center, Korea Research Institute of Bioscience and Biotechnology)
Park, Chan-Sun (Bioindustry Research Center, Korea Research Institute of Bioscience and Biotechnology)
Yoon, Byung-Dae (Bioindustry Research Center, Korea Research Institute of Bioscience and Biotechnology)
Kim, Min-Soo (Bioindustry Research Center, Korea Research Institute of Bioscience and Biotechnology)
Publication Information
Korean Journal of Microbiology / v.45, no.1, 2009 , pp. 63-68 More about this Journal
Abstract
The exo-polysaccharide producing microorganism, Aureobasidium pullulans IMS-822, was isolated and identified from soil. The viscosity-average molecular weight of exo-polysaccharide was calculated as $8.9{\times}10^5$ by Mark-Houwink equation. The sugar component of exo-polysaccharide was determined as glucose by HPLC analysis. The IR spectra indicated that the exo-polysaccharide has an absorption peak at 890 $cm^{-1}$ for the ${\beta}-configuration$ of D-glucan. The $^{13}C$ NMR signal at ${\delta}$ 86.62 ppm arose from the substituted C-3 of glucose. The signal at ${\delta}$ 72.11 ppm was assigned to C-6 of branched ${\beta}-(1{\to}3)-D-glucosyl$ residues. Viscosity and Congo red reaction indicated that {\beta}-(1{\to}3)(1{\to}6)-glucan$ produced by A. pullulans IMS-822 has a highly ordered hydrogen-bond dependent conformation in aqueous solution, which collapses in strong alkaline solution.
Keywords
Aureobasidium sp.; ${\beta}-(1{\to}3)(1{\to}6)-glucan$; viscosity-average molecular weight; aqueous conformation;
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