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Effect of gamma-radiation on a water-insoluble arabinoxylan

✍ Scribed by Anna Ebringerová; Jozef Pružinec; Marta Kačuráková; Zdenka Hromádková

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
492 KB
Volume
38
Category
Article
ISSN
0021-8995

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✦ Synopsis

The effect of gamma radiation on a water-insoluble L-arabino-D-xylan has been studied by functional group and structural analysis using chemical methods and IR spectroscopy, by sugar composition analysis, and by viscosity measurements. The gamma irradiation has been shown to modify both sugar components of the arabinoxylan, accompanied by cleavage of the glycosidic linkages, depolymerization, and sugar decomposition, depending on the applied radiation dose, thus increasing the molecular and chemical heterogeneity of the polysaccharide.

EXPERIMENTAL

Materials. The starting arabinoxylan was isolated from rye bran holocellulose by an alkaline fractional extraction procedure' and used in the freeze-dried form. The polysaccharide with the intrinsic viscosity [v] = 197 cm3 g-', contained in dry matter D-xylose (69.4%), L-arabinose (20.2%), D-glucose (6.8%), D-galactose (1.6%), and D-glucuronic acid ( < 1%).

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