Autocatalytic Reaction in Hydrolysis of Difructose Anhydride III

作者：Chan Tzu Hsin; Chen Po Tuan; Chang Hsuan Hau; Lai Ming Yu; Hayashi Michitoshi; Wang Juen Kai^*; Wang Yuh Lin

来源：Journal of Physical Chemistry A, 2011, 115(37): 10309-10314.

DOI：10.1021/jp206494r

Hydrolysis of several polysaccharides in neutral and weak acid environment has been shown to exhibit autocatalytic behavior. Because the pH value of the solution decreases during hydrolysis, it has been proposed that proton is the catalyst of the autocatalytic reaction. We monitored the hydrolysis of difructose anhydride III (DFA III) in both strong and weak acid environment using Raman spectroscopy and found that it is also an autocatalytic reaction. Its Raman signatures were analyzed with ab initio method. When the reaction product, fructose, is added in the beginning of the reaction, the speed of hydrolysis increases to a magnitude that cannot be explained by the rate enhancement due to a decrease in the pH value, indicating that proton alone is not an effective catalyst for the reaction. It is the combination of proton and a certain form of reaction product such as monosaccharide or its derivatives that catalyzes the hydrolysis of difructose anhydride III. Similar results are observed in the hydrolysis of cellobiose, suggesting the universality of this autocatalytic reaction. Our findings provide the first clue to a new autocatalytic pathway in the hydrolysis of polysaccharides.

• 出版日期2011-9-22
• 单位中国科学院