Effects of Water Soluble Dietary Fibers on ZincAbsorption in Rats Hiroshi HARA, Ayako KONISHI and Takanori KASAI
Department of Bioscience and Chemistry, Faculty of Agriculture,
Hokkaido University
There are controversial results for the effects ofdietary fiber intake on zinc absorption. In the present study, weexamined the effects of five refined water-soluble dietary fiberswith different physical and chemical properties on zinc absorptionin rats. Sprague-Dawley male rats, weighing 50 g, were acclimatedand fed a basal diet (control) or five test diets containing 50g/kg diet fiber sources, arabinogalactan, partially hydrolyzed guargum (GGH), carboxymethyl cellulose (CMC), psyllium and guar gum for3 weeks. There was no difference in body weight and food intakeamong the six groups of rats. Apparent zinc absorption (rates andamounts) for 3days from Day 8 and Day 18 after the starting testdiets were lower in rats fed CMC compared with the control group.In later test period, zinc absorption was lower in the psylliumgroup than the two low viscous fibers, arabinogalactan and GGH-fedgroups. However, high viscosity may not be involved in loweringzinc absorption because the absorption in rats fed guar gum, thehighest viscous fiber, was not lower than in rats of the controlgroup. Changes in femur zinc concentration among the groups weresimilar to the changes in the zinc absorption. In conclusion, CMCingestion was clearly lowered zinc absorption, but other foursoluble fibers were not.
Key words: Zinc absorption, water soluble dietary fiber, viscosity,fermentation, rats |
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