Analysis of the carbon-13 n.m.r. spectrum of hydrolyzed O-(carboxymethyl)cellulose: monomer composition and substitution patterns
作者:Jacques Reuben、Herbert T. Conner
DOI:10.1016/0008-6215(83)88129-4
日期:1983.4
O-(carboxymethyl)cellulose (CMC). Quantitative analysis of the latter spectrum yields the composition of CMC in terms of the mole fractions of the eight component monomeric residues. The results on the monosaccharide composition for a series of samples having degrees of substitution in the range 0.55–2.17 are described well by Spurlin's statistical kinetic model for the arrangement of substituents (substitution
在位置2、3和6的每个位置上的O-羧甲基化对葡萄糖的13C化学位移的影响已被用来首先分配2,3-,2,6-和3,6-的13C-nmr光谱。二-O-(羧甲基)葡萄糖和2,3,6-三-O-(羧甲基)-葡萄糖,然后是水解的O-(羧甲基)纤维素(CMC)的光谱。根据八种组分单体残基的摩尔分数,对后一光谱的定量分析得出CMC的组成。Spurlin的纤维素衍生物中取代基排列(取代模式)的统计动力学模型很好地描述了一系列取代度在0.55-2.17范围内的样品的单糖组成结果。该模型假设取代模式受葡萄糖残基中三个羟基反应的相对速率常数控制。在这项工作中确定的常数值为k2:k3:k6 = 2.14:1.00:1.58。