GOMAA, K and KRAUS, J and FRANZ, G and ROPER, H (1991) STRUCTURAL INVESTIGATIONS OF GLUCANS FROM CULTURES OF GLOMERELLA-CINGULATA SPAULDING AND VONSCHRENCK. CARBOHYDRATE RESEARCH, 217. pp. 153-161. ISSN 0008-6215,
Full text not available from this repository.Abstract
Methylation analysis, enzymic digestion, n.m.r. spectroscopy, and Smith degradation showed that the major extracellular polysaccharide, isolated from cultures of the fungus Glomerella cingulata, was a (1 --> 3)-beta-D-glucan with side chains of 1-4 (1 --> 3)-linked beta-D-glucose residues attached to position 6. A (1 --> 6)-beta-D-glucan was produced by the fungus in small proportions. Treatment of the (1 --> 3,1 --> 6)-beta-D-glucan (890 315) with > 0.05M NaOH at > 150-degrees, or Me2SO-H2O with a concentration of dimethyl sulfoxide of > 80%, irreversibly destroyed the highly ordered structure responsible for the high viscosity of aqueous solutions. The strong shift of the lambda-max of aqueous solutions of Congo Red by the degraded glucan, the fact that the mol. wt. of the original glucan was approximately 4 times higher than that of the degraded polymer, and the suppression of the n.m.r. signals for C-3 indicated that the original glucan had a highly ordered structure, probably built up from single helices.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MOLECULAR-WEIGHT; AQUEOUS-SOLUTION; POLYSACCHARIDE; (1->3)-BETA-D-GLUCAN; LENTINAN; SCHIZOPHYLLAN; CONFORMATION; BEHAVIOR; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/54863 |
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