doi: 10.1016/s0008-6215(03)00240-4.
Structural characterization of Botryosphaeran: a (1-->3;1-->6)-beta-D-glucan produced by the ascomyceteous fungus, Botryosphaeria sp
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- PMID:12873424
- DOI: 10.1016/s0008-6215(03)00240-4
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Structural characterization of Botryosphaeran: a (1-->3;1-->6)-beta-D-glucan produced by the ascomyceteous fungus, Botryosphaeria sp
Aneli M Barbosa et al. Carbohydr Res..
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Abstract
The exopolysaccharide, Botryosphaeran, produced by the ligninolytic, ascomyceteous fungus Botryosphaeria sp., was isolated from the extracellular fluid by precipitation with ethanol, and purified by gel permeation chromatography to yield a carbohydrate-rich fraction (96%) composed mainly of glucose (98%). Infra-red and 13C NMR spectroscopy showed that all the glucosidic linkages were in the beta-configuration. Data from methylation analysis and Smith degradation indicated that Botryosphaeran was a (1-->3)-beta-D-glucan with approx 22% side branching at C-6. The products obtained from partial acid hydrolysis demonstrated that the side branches consisted of single (1-->6)-beta-linked glucosyl, and (1-->6)-beta-linked gentiobiosyl residues.
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