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The effect of phytate and fiber source on phytate hydrolysis and mineral availability in rats



The effect of phytate and fiber source on phytate hydrolysis and mineral availability in rats



Nutrition Reports International 30(5): 1089-1100



Two experiments were conducted to determine effects: of the source of dietary fiber and of phytate on the ability of rats to hydrolyze phytate; and on the availability of minerals in the diet. In experiment 1, male weanling rats were fed a corn-soybean basal diet or diets composed of 90% of the basal and 10% of either wheat bran, alfalfa meal, cellulose, or cottonseed hulls. Rats fed the diet containing wheat bran hydrolyzed more phytate (P < 0.05) than those fed the other diets. Rats fed the diet containing cottonseed hulls hydrolyzed less phytate (P < 0.05) than those fed the basal diet and diets containing either wheat bran or cellulose. Hydrolysis of phytate by rats fed the basal diet and the diets containing either alfalfa meal or cellulose was not significantly different from the basal. In experiment 2, weanling rats were fed a corn-soybean meal basal diet or the basal diet supplemented with either rice bran or cellulose to attain phytic acid and acid detergent fiber levels of 0.88% and 5.8%; 0.84% and 10.6%; 1.3% and 5.8%; 1.2% and 10.6%. Feeding cellulose reduced (P < 0.05) phytate hydrolysis by rats, which was associated with decreased Zn concentration in the tibia. Cellulose had no effect on the serum or tissue mineral concentrations or on the time required for passage of feed. Feeding rice bran had no effect on serum levels of Ca, P, Mg, serum ceruloplasmin activity, liver concentration of Zn, Cu and Mg; tibia concentrations of Ca and Zn; or on feed passage time. There was no interaction between dietary treatment and the sex of rats; however, female rats had higher (P < 0.05) serum ceruloplasmin activity and higher (P < 0.05) liver concentrations of Cu and Zn than male rats.

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