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| J Agric Food Chem 2001 Feb;49(2):1026-9 |
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In vitro study of possible role of dietary fiber in lowering
postprandial serum glucose.
Ou S, Kwok K, Li Y, Fu L.
Research Center of Food Science and Technology, Jinan University,
Guangzhou 510632, People's Republic of China. tosy@jnu.edu.cn
There have been many reports concerning the role of dietary
fiber in lowering postprandial serum glucose, and the main mechanism
was regarded as the viscosity of different dietary fibers in
hampering diffusion of glucose and postponing absorption and
digestion of carbohydrates. In this paper, two kinds of water-insoluble
dietary fibers, water-insoluble dietary fiber of wheat bran
and enzyme-resistant starch of maize amylose, and four kinds
of water-soluble dietary fibers, water-soluble dietary fiber
of wheat bran, carboxymethyl cellulose, guar gum, and xanthan
gum, were used to investigate their postprandial serum glucose
lowering mechanism in vitro. The results showed that these dietary
fibers lowered postprandial serum glucose levels at least by
three mechanisms. First, dietary fibers increase the viscosity
of small intestine juice and hinder diffusion of glucose; second,
they bind glucose and decrease the concentration of available
glucose in the small intestine; and, third, they retard alpha-amylase
action through capsuling starch and the enzyme and might directly
inhibit the enzyme. All of these decreased the absorption rate
of glucose and the concentration of postprandial serum glucose.
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