Degree of polymerization and polydispersity of xylan from the cell wall of the green seaweed Penicillus dumetosus
✍ Scribed by W. Mackie; D. B. Sellen
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1971
- Tongue
- English
- Weight
- 373 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0006-3525
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✦ Synopsis
Xylan was extracted from t,he cell wall of the green seaweed Penicillus duinotosus using a very mild procedure. Xylan dinitrate samples were prepared and their degrees of polymerization found to depend markedly on temperature of nitrat,iori, the best compromise between yield and degradation being a t about. -20°C. Two samples, one obtained under optimum conditions and one highly degraded, were investigated in detail by using light-scattering, osmometry, gel-permeation chromatography, arid viscosity techniques. The result,s show that there are xylan chains present in t,he cell wall having degrees of polymerization above 10,000. This figure is much higher than those previously found for other similar xylans. The light-scattering results show that the xylan diiiit,rate molecule is milch smaller t,han the molecules of the trinitmtes of other structural polysaccharides (cellulose yid mantiati) for the same degree of polymerization. The effective bond length b is 16 A, assuming a linear chain.