PHYSICOCHEMICAL PROPERTIES OF AQUEOUS-SOLUTIONS OF XANTHAN - AN NMR-STUDY

被引：25

作者：

GAMINI, A ^{[1
]}

DEBLEIJSER, J ^{[1
]}

LEYTE, JC ^{[1
]}

机构：

[1] LEIDEN UNIV,GORLAEUS LABS,DEPT PHYS & MACROMOLEC CHEM,POB 9502,2300 RA LEIDEN,NETHERLANDS

来源：

CARBOHYDRATE RESEARCH | 1991年 / 220卷

关键词：

D O I：

10.1016/0008-6215(91)80004-7

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 conformations of xanthan in aqueous solution as a function of temperature have been studied. Measurements of optical activity indicate that the conformational transition, induced by varying the polymer concentration, is analogous to that induced by changes in ionic strength and pH. Within a certain range of concentrations, the low-temperature conformation has a molecular-weight-dependent stability, which shows the usual sigmoidal melting profile with increase of temperature. The C-13-n.m.r. data reflect the increase of the mobility of C-1 and the side-chain carbon atoms in the transition-temperature region. The Na-23 relaxation behaviour changes on melting the ordered xanthan conformation. At least two correlation times are needed in order to describe the field-strength dependence of the longitudinal and transverse Na-23 relaxation. At 25-degrees, a value of 6.8 ns is obtained for the largest correlation time for the fluctuations of the electric-field gradient. The high-temperature conformation also generates correlation times of the order of ns. From O-17 relaxation measurements, a reduction of the mobility of water molecules in the presence of xanthan chains is also observed.

引用

页码：33 / 47

页数：15

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