摘要
分别以两种抗性淀粉为唯一碳源,对直肠菌群进行体外发酵。通过研究发现,发酵过程中两种培养基的pH呈逐渐下降的趋势;双歧杆菌属、乳杆菌属的数量呈上升趋势;肠球菌属和肠杆菌属的数量也能保持比较稳定的数量,而拟杆菌的数量在发酵中后期开始减少,但总厌氧菌数比较稳定,因此发酵过程中肯定有不同菌属的生长演替;两种碳源均能被肠道菌群利用产生短链脂肪酸,其中以丙酸的量最大。乳酸在发酵过程中被积累并能快速被一些直肠菌群利用而消耗。
Potato resistant starch and sweet potato resistant starch were taken respectively as only carbon source to ferment colonic microfiora in vitro.The results showed that during the fermentation process in vitro,the pH value of the two culture was gradually decline. In two media with different carbon source, the colonies counts of Bifidobacterium, Lactobacillus showed an upward trend, the number of Enterococcus and Enterobacter remained relatively stable at different fermentation periods, the number of Bacteroides began to reduce in the late of fermentation,and the number of total anaerobic bacterium remained stable. Therefore, the growth succession of different species must be sure in the process of fermentation. The colon microbial could utilize the two carbon sources to produce SCFAs, of which the largest amount was propionate.During the fermentation process lactic acid was accumulated and promptly consumed by colonic microflora.
出处
《食品工业科技》
CAS
CSCD
北大核心
2011年第4期148-151,共4页
Science and Technology of Food Industry
基金
暨南大学青年基金(51208029)
关键词
抗性淀粉
体外发酵
肠道菌群
短链脂肪酸
resistant starch
fermentation in vitro
colonic microflora
short chain fatty acids
