摘要
通过考察90℃,0.5‰过硫酸铵对瓜尔胶、羟丙基瓜尔胶及其羧甲基羟丙基瓜尔胶不同时间的氧化降解反应,发现开始时瓜尔胶主链主要是以糖苷键断裂的降解为主,当降解到一定程度后,才出现糖链上糖环的氧化。瓜尔胶的结构对降解反应有着很大的影响,而且降解速度:羧甲基羟丙基瓜尔胶>羟丙基瓜尔胶>瓜尔胶。形态观测结果表明氧化降解对微观结构有一定的影响。
Degradations of guar gum,hydroxypropyl guar gum and carboxymethyl hydroxypropyl guar gum by 0.5 ‰ of ammonium persulfate at the temperature of 90 ℃ were investigated.The results showed the oxidation of the sugar ring didn＇t occur until the backbone of guar gum was degraded to a certain degree by glycosidic bond breaking.The structure of guar gum has a great influence on the degradation reaction.Degradation rate has been found to be： carboxymethyl hydroxypropyl guar gum hydroxypropyl guar gum guar gum.Morphological observations show that the oxidative degradation influences the microstructure of the products.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2010年第12期1546-1550,共5页
Chemical Research and Application
关键词
瓜尔胶
氧化
降解
分子量
guar gum
oxidation
degradation
molecular weight
