Kinetics and mechanism of the reaction of ammonium persulfate with ferulic acid and sugar-beet pectins
作者:Jean-François Thibault、Carole Garreau、Dominique Durand
DOI:10.1016/0008-6215(87)80161-1
日期:1987.6
viscometry, 1 H-n.m.r. spectroscopy, and gel-permeation chromatography. The reactions followed a pseudo-first-order law with respect to pectin and ferulate, whereas the order with respect to ammonium persulfate was unity for pectins and varied from 0.5 to > 2 for ferulate. The rate constants mainly varied with the pH of the reaction mixture and there was an optimum at 3.8–5.7 for the gelation of the pectins
摘要通过分光光度法,粘度计,1 Hn.mr光谱和凝胶渗透色谱法研究了过硫酸铵对(阿魏酸酯化的)甜菜果胶和阿魏酸的作用。对于果胶和阿魏酸盐,反应遵循伪一级定律,而对于果胶,过硫酸铵的次序统一,对于阿魏酸盐,其变化范围从0.5到> 2。速率常数主要随反应混合物的pH值而变化,果胶的凝胶化最佳值为3.8-5.7。结果排除了两个阿魏酸酯之间简单的缩合过程(或与果胶连接的阿魏酸酯残基),并表明存在自由基聚合反应。