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《Acta Nutrimenta Sinica》 2002-02
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EFFECTS OF RESISTANT STARCH ON ZINC STATUS IN RATS

WANG Zhu, MEN Jian hua, YANG Xue xin, HONG Jie (Institute of Nutrition and Food Hygiene, Chinese Academy of Preventive Medicine, Beijing 100050, China)  
Objective: To investigate the specific effects of resistant starch (RS) on zinc status in rats. Methods: (1)Zinc metabolism in normal rats: Three groups of Wistar rats were fed with basal diet (control), diet with 13% or 26% RS respectively, for 18 days. Urine, fecal and blood samples were collected for zinc measurement. Zinc apparent absorption was calculated.(2)Zinc status in rats fed with high sucrose (50%) diet: Three groups of Wistar rats were fed with basal diet, high sucrose digestible starch diet (S DS) or high sucrose resistant starch diet (S RS, containing 14% RS) respectively for 12 w. Samples of urine, blood, liver, pancreas and kidney were collected for measurement of zinc content. Results: (1)Zinc apparent absorption in normal rats was: control group 56.59%, 13%RS group 50.11%, and 26%RS group 54.40%. (2)High sucrose diet led to increased postprandial glucose and HbA 1C and depressed fast insulin level in S DS group rats, with decreased plasma and pancreas zinc level (compared with control group, P0.05). In S RS group, the rats were of normal blood glucose status, with lower urine excretion and higher erythrocyte zinc level compared with S DS group (P0.05). High kidney zinc was detected in S RS group. Conclusion: RS has no effect on zinc apparent absorption in normal rats. But for the rats fed with high sucrose diet, RS is of potential benefit to maintenance of zinc status.
【Fund】: 国家自然科学基金 (No.3 0 0 70 65 7
【CateGory Index】: R151.3
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