Further mechanistic orientation for the oxidation reaction between alkaline permanganate and poly galacturonate methyl ester. Novel spectrophotometric tracer of intrahypomanganate(V) - Intermediate

被引：14

作者：

Shaker, Ali Mohamad ^{[1
]}

El-Khatib, Rafat Mohamad ^{[1
]}

Nassr, Lobna Abdel-Mohsen Ebaid ^{[1
]}

机构：

[1] Sohag Univ, Fac Sci, Dept Chem, Sohag 82524, Egypt

来源：

CARBOHYDRATE POLYMERS | 2009年 / 78卷 / 04期

关键词：

Pectin; KMnO4; Oxidation; Kinetics; Alkaline medium; Poly galacturonate methyl ester; POLYELECTROLYTE IONOTROPIC GELS; ALGINATE POLYSACCHARIDE; POTASSIUM-PERMANGANATE; DRUG-DELIVERY; KINETICS; COMPLEX; MANGANATE(VI); CELLULOSE; DECOMPOSITION; SOL;

D O I：

10.1016/j.carbpol.2009.06.007

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The kinetics of formation of the green manganate(VI) intermediate complex formed during the oxidation of pectin polysaccharide (poly galacturonate methyl ester) (PGME) by MnO4- in alkaline solution at pH >= 12 have been studied. The rate law was suggested to be: rate = k(obs).[MnO4-]. The reaction was found to be base - catalyzed and fractional second - order in [PGME]. The activation parameters have been evaluated and discussed. A reaction mechanism was suggested according to the experimental data. A new blue hypomanganate(V) coordination polymer intermediate sol was spectrophotometrically detected for the first time for pectin (poly galacturonate methyl ester) oxidation reaction, A further mechanistic presentation was proposed. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：710 / 716

页数：7