An NMR relaxation study of the state of water in gelatin gels

被引：43
作者：
Vackier, MC
Hills, BP
Rutledge, DN
机构：
[1] Inst Natl Agron Paris Grignon, Chim Analyt Lab, F-75231 Paris 05, France
[2] Inst Food Res, Norwich NR4 7UA, Norfolk, England
来源：
JOURNAL OF MAGNETIC RESONANCE | 1999年 / 138卷 / 01期
关键词：
time domain nuclear magnetic resonance; relaxation time; correlation time; matrix mobilization; cross-relaxation;
D O I：
10.1006/jmre.1999.1730
中图分类号：
Q5 [生物化学];
学科分类号：
071010 ; 081704 ;
摘要：
A combination of H-1 and Na-23 NMR is used to probe the dynamic state of water in gelatine gels as the water content is lowered from 70% to dryness. A sharp increase in the proton and sodium transverse relaxation rates is observed as the water content falls from 20 to 15% while the proton longitudinal and dipolar cross relaxation rates show a maximum at ca, 15%. We show that these observations can be understood if monolayer coverage occurs at 15% and multilayers of less strongly interacting hydration water are formed between 15 and 20%. Above 20% the water appears to behave as an unperturbed bulk phase, (C) 1999 Academic Press.
引用
收藏
页码：36 / 42
页数：7
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