MECHANISMS OF OXIDATIVE DEGRADATION OF CARBOHYDRATES DURING OXYGEN DELIGNIFICATION. II. REACTION OF PHOTOCHEMICALLY GENERATED HYDROXYL RADICALS WITH METHYL β-CELLOBIOSIDE

Autor:	Raymond C. Fort, D. F. Guay, K. R. Overly, Thomas Elder, M. C. Hausman, J. M. Genco, Barbara J. W. Cole
Rok vydání:	2001
Předmět:	chemistry.chemical_classification Substitution reaction Reaction mechanism General Chemical Engineering Radical Glycosidic bond General Chemistry Cellobiose chemistry.chemical_compound chemistry Polymer chemistry Organic chemistry General Materials Science Hydroxyl radical Cellulose Bond cleavage
Zdroj:	Journal of Wood Chemistry and Technology. 21:67-79
ISSN:	1532-2319 0277-3813
DOI:	10.1081/wct-100102655
Popis:	Reactions involving methyl β-cellobioside and several oxygen species were used to investigate cleavage of glycosidic linkages in cellulose by reaction with photochemical hydroxyl radicals. The intent is not to reproduce delignification conditions, but rather to study the specific behavior of carbohydrate models toward hydroxyl radical. Experiments show that hydroxyl radicals are responsible for the degradation of glycosidic linkages in methyl β-cellobioside by substitution reactions displacing cellobiose, D-glucose, methyl β-D-glucoside, and methanol. Once the glycosidic linkages are broken, the reducing carbohydrates undergo a series of reactions forming aldonic acids and lower order aldoses in the same manner as described previously.[1]
Databáze:	OpenAIRE
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