DIFFUSION OF WATER IN THE ENDOSPERM TISSUE OF WHEAT GRAINS AS STUDIED BY PULSED FIELD GRADIENT NUCLEAR MAGNETIC-RESONANCE

被引：178

作者：

CALLAGHAN, PT ^{[1
]}

JOLLEY, KW ^{[1
]}

LELIEVRE, J ^{[1
]}

机构：

[1] MASSEY UNIV,DEPT FOOD TECHNOL,PALMERSTON NORTH,NEW ZEALAND

来源：

BIOPHYSICAL JOURNAL | 1979年 / 28卷 / 01期

关键词：

D O I：

10.1016/S0006-3495(79)85164-4

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

Pulsed field gradient nuclear magnetic resonance has been used to measure water self-diffusion coefficients in the endosperm tissue of wheat grains as a function of the tissue water content. A model that confines the water molecules to a randomly oriented array of capillaries with both transverse dimension less than 100 nm has been used to fit the data and give a unique diffusion coefficient at each water content. The diffusion rates vary from 1.8 x 10(-10) m2s-1 at the lowest to 1.2 x 10(-9) m2s-1 at the highest moisture content. This variation can be explained in terms of an increase in water film thickness from approximately 0.5 to approximately 2.5 nm over the moisture range investigated (200–360 mg g-1). © 1979, The Biophysical Society. All rights reserved.

引用

页码：133 / 141

页数：9