肠道微生态对抗性淀粉的作用

Effects of Intestinal micro ecology on resistant starch

目的探寻天然香蕉抗性淀粉在大鼠消化系统内被降解的规律。方法以天然香蕉抗性淀粉为原料,以抗性淀粉的残留率为指标,在不同时间点,取大鼠的不同部位进行抗性淀粉残留量的检测,根据残留率的变化情况,推断抗性淀粉在大鼠消化道内被消化分解的规律。结果在给大鼠喂食抗性淀粉后的20 min内,抗性淀粉还未到达大肠,胃和小肠内的抗性淀粉残留量基本为3 g;在喂食抗性淀粉80 min^90 min时,胃和小肠内均无抗性淀粉残留,而抗性淀粉在大肠内的残留量远远<3 g;收集喂食抗性淀粉后360 min的粪便,测定其抗性淀粉的残留量为0.1213 g,已经被消化分解。结论胃和小肠对抗性淀粉几乎没有消化作用,而大肠对抗性淀粉有很强的消化作用,抗性淀粉在大肠的微生态环境下能够被充分的降解和利用。

Objective To study the degradation law of resistant starch II（ RS2） in mice digestive system. Methods Resistant starch of banana was used as raw material,residual rates of RS2 for target,at the different time,take the mice different parts to detect the residual rates of RS2,according to the changes of residual rates to conclude the degradation law of RS2 in mice digestive system. Results Feeding mice on RS2,in 20 minutes,RS2didn＇t reach the large intestine,and the residual level of RS2 in stomach and small intestine is about 3 g; in 80 min - 90 min,stomach and small intestine have no RS2,and the residual level of RS2 in large intestine is less than 3 g; Collecting the feces in 360 min,the residual level of RS2 is 0. 1213 g,and the RS2 has been digested. Conclusion The stomach and small intestine cannot digest the resistant starch,but the large intestine has strong digestion. The RS2 could be degradation and utilization in the ecological environment of large intestine.