Mechanisms of oxidative degradation of carbohydrates during oxygen delignification. II. Reaction of photochemically generated hydroxyl radicals with methyl beta-cellobioside
Df. Guay et al., Mechanisms of oxidative degradation of carbohydrates during oxygen delignification. II. Reaction of photochemically generated hydroxyl radicals with methyl beta-cellobioside, J WOOD CH T, 21(1), 2001, pp. 67-79
Reactions involving methyl beta -cellobioside acid several oxygen species w
ere used to investigate cleavage of glycosidic linkages in cellulose by rea
ction with photochemical hydroxyl radicals. The intent is not to reproduce
delignification conditions, but rather to study the specific behavior of ca
rbohydrate models toward hydroxyl radical. Experiments show that hydroxyl r
adicals are responsible for the degradation of glycosidic linkages in methy
l beta -cellobioside by substitution reactions displacing cellobiose, D-glu
cose, methyl beta -D-glucoside, and methanol. Once the glycosidic linkages
are broken, the reducing carbohydrates undergo a series of reactions formin
g aldonic acids and lower order aldoses in the same manner as described pre
viously.(1).