Structural analysis and rheological behaviour of an extracellular polysaccharide from Drechslera spicifera
| Autor: | Alain Heyraud, B. Fournet, S. Aouadi, R. Steiman, F. Seigle-Murandi |
|---|---|
| Přispěvatelé: | Centre de Recherches sur les Macromolécules Végétales (CERMAV), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF) |
| Rok vydání: | 1992 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Stereochemistry Organic Chemistry Lentinan Concentration effect Polysaccharide carbohydrates (lipids) Viscosity Residue (chemistry) chemistry.chemical_compound chemistry Ionic strength Polymer chemistry Materials Chemistry Solubility ComputingMilieux_MISCELLANEOUS Glucan |
| Zdroj: | Carbohydrate Polymers Carbohydrate Polymers, Elsevier, 1992, pp.177-183 |
| ISSN: | 0144-8617 |
| DOI: | 10.1016/0144-8617(92)90002-8 |
| Popis: | The fungus Drechslera spicifera produces a high viscosity extracellular glucan polymer in Galzy and Slonimski medium containing glucose. This polysaccharide submitted to methylation study, Smith degradation and enzymic hydrolysis was concluded to be composed of a backbone of β (1 → 3)-linked d -glucopyranosyl residues and possessed two single branches of a β- d -glucopyranosyl residue joined through C-6 for every five d -glucopyranosyl residues of the backbone as lentinan from Lentinus edodes . In water solution, this polysaccharide developed a high viscosity, ten times the viscosity of scleroglucan, and showed good thermal stability. Its behaviour was investigated as a function of the sodium hydroxide concentration. At low NaOH concentration the viscosity rises, due to an increase in solubility and probably to interchain interactions with proteins. When the NaOH concentration increased, there was a rapid and irreversible decrease in the viscosity attributed to a conformational transition. |
| Databáze: | OpenAIRE |
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