FT-IR study of pectate and pectinate gels formed by divalent cations

被引：90

作者：

Wellner, N

Kacuráková, M

Malovíková, A

Wilson, RH

Belton, PS

机构：

[1] Inst Food Res, Norwich NR4 7UA, Norfolk, England

[2] Slovak Acad Sci, Inst Chem, Bratislava 84238, Slovakia

来源：

CARBOHYDRATE RESEARCH | 1998年 / 308卷 / 1-2期

基金：

英国生物技术与生命科学研究理事会;

关键词：

FT-IR; pectate gels; junction zones; divalent cations;

D O I：

10.1016/S0008-6215(98)00065-2

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The interaction of divalent cations with potassium pectate and three potassium pectinate samples with degrees of esterification E of 23.8, 59.1 and 93.4% were studied by FT-IR spectroscopy. Characteristic shifts occurred in C-O and ring vibrations in the 1200-900 cm(-1) region as well as in the nu(as) and nu(s) carboxylate bands at around 1617 and 1420 cm(-1), indicating a metal coordination by the pectate chains in accordance with the 'egg-box' hypothesis [Grant et al. FEBS Lett., 32 (1973) 195-198]. The FT-IR spectra showed some interaction between pectate and K+ and Mg2+ even when no gels were formed. Ca2+ and Sr2+ interacted strongly with pectate and low methoxyl pectinates. Ni2+, Cu2+, Zn2+, Cd2+, and Pb2+ also showed complex formation with the pectinates at E=59.1%, and Pb2+ and Cu2+ to some extent even with very highly esterified pectinate (E=93.4%). (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：123 / 131

页数：9

共 32 条

[1] EXTENDED X-RAY ABSORPTION FINE-STRUCTURE INVESTIGATION OF SOLID AND GEL FORMS OF CALCIUM POLY(ALPHA-D-GALACTURONATE) [J].