Effect of RS3 on the Absorption of Iron and Manganese Trace Elements in Rats
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Abstract:
The effect of RS3-resistant starch on the absorption of iron and manganese in rats was studied. Thirty-two male Wistar rats were randomly divided into four groups: the control group, 20%-RS3 group, 40%-RS3 group, and 60%-RS3 group. The starch in the basic feed was replaced by 0%, 20%, 40%, and 60% RS3, respectively. The duration of the testing period was 35 days. The amounts of iron and manganese in the feed, feces, serum, liver, hair, ileum content, and cecum content were determined by flame atomic absorption spectrophotometer and the apparent absorption was calculated. The results revealed that the apparent absorption rate of iron in the 40%-RS3 and 60%-RS3 groups was higher than that in the control group (p<0.05). The iron content in the liver of the 40%-RS3 and 60%-RS3 groups was also higher than that in the control group (p<0.01). No significant difference was found in the amounts of iron in the serum and hair between the control group and experimental groups (p>0.05). The amount of soluble iron and the ratio of soluble iron/total iron in the ileum and cecum contents of the 40%-RS3 and 60%-RS3 groups were higher than that in the control group (p<0.05). With the increase of RS3 intake, the apparent absorption rate of manganese, soluble manganese, and the ratio of soluble manganese/total manganese in the ileum and cecum contents was found to increase, but the difference was not statistically significant. This study demonstrated that RS3 increased the solubility of iron in the ileum and cecum and effectively improved the absorption of iron. RS3 might also promote the absorption of manganese in rats.
