Chemiluminescence related to degradation of thermally oxidized pullulans.: Comparison with cellulose and dextran

被引：7

作者：

Pletenikova, Martina ^{[1
]}

Matisova-Rychla, Lyda ^{[1
]}

Rychly, Jozef ^{[1
]}

Lacik, Igor ^{[1
]}

机构：

[1] Slovak Acad Sci, Inst Polymer, Ctr Excellence Degradat Biopolymers, Bratislava 84236, Slovakia

来源：

CARBOHYDRATE POLYMERS | 2007年 / 69卷 / 01期

关键词：

thermal oxidation; degradation; chemiluminescence; pullulan; cellulose; dextran;

D O I：

10.1016/j.carbpol.2006.08.022

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The degradation of pullulan, cellulose and dextran in the presence of oxygen was examined by chemiluminescence and by size-exclusion chromatography (SEC) methods. While 1,4-alpha glycosidic bonds in pullulan are split thermally only with a slight effect of oxygen, thermolysis of 1,4-beta bonds in cellulose and 1,6-alpha bonds in dextran is preceded by free radical oxidation of carbon 6 of glucopyranose unit with formation of carboxyl groups and water contributing to the subsequent induced degradation of polysaccharide. MgO which remains in polysaccharide after its impregnation by methoxy magnesium methyl carbonate (MMMC) promotes the reaction of terminal semiacetal groups and/or hydroperoxides which has considerably higher quantum yield of light emission. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：50 / 64

页数：15