Abstract
Ultraviolet radiation degradation of dilute aqueous solutions of chondroitin-6-sulphate has been investigated using 184·9 nm, 194·2 nm and 253·7 nm radiations. Two different pathways are involved. The degradation proceeds via H • atom abstraction with 184·9 nm radiation and via chondroitin-6-sulphate free radicals with 194·2 nm and 253·7 nm radiation, rupturing glycosidic linkages, as indicated by depolymerization of the polysaccharide. Depolymerization produces changes in metachromasia of Acridine Orange, reducing-end group, hexuronic acid and hexosamine moieties of chondroitin-6-sulphate. No release of sulphate was observed. The effects of the three wavelengths on these parameters in an oxygen or nitrogen atmosphere and the existence of two degradation pathways are discussed.
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