双歧因子是人体肠道的主要的有益菌—双歧杆菌有极佳的增殖效果的一种含有支链的低聚糖。目前国内应用比较普遍的双歧因子是异麦芽低聚糖。麦芽低聚糖由于其特有的分子结构,在人体消化道中无法将其消化降解,不能被人体吸收利用。而异麦芽低聚糖可以直接进入肠道,被生长在肠道中的对人体有益的细菌利用。肠道微生物按与人体的关系可分为有益菌、有害菌和兼性细菌。有益菌包括双歧杆菌、乳酸杆菌等;有害菌主要是梭状芽孢杆菌;兼性菌包括链球菌、大肠杆菌等。它们在正常健康人体内与人体相安无事,在人体肠道中按一定数量和比例共同生长繁殖,并构成一种相对平衡稳定的微生物生态体系,但在人体发病、营养不良或因服用抗生素这种微生态平衡就有可能被破坏,兼性菌将会转化为致病菌,从而导致人体疾病。尤其是婴幼儿在3个月以后经常患有 Bifidus factor is the main beneficial bacteria in human intestine - Bifidobacterium has a very good proliferation effect of a branched-chain oligosaccharides. At present, the bifidus factor commonly used in China is isomalto-oligosaccharide. Due to its unique molecular structure, malt oligosaccharide can not be digested and degraded in human digestive tract and can not be absorbed by human body. Isomaltooligosaccharides can enter the gut directly and are used by bacteria that are beneficial to humans in the gut. Intestinal microorganisms according to the relationship with the human body can be divided into beneficial bacteria, harmful bacteria and facultative bacteria. Beneficial bacteria include Bifidobacterium, Lactobacillus; harmful bacteria mainly Clostridium; facultative bacteria including Streptococcus, Escherichia coli and so on. They are in normal and healthy human body no problem in the human intestine by a certain number and the proportion of common growth and reproduction, and constitute a relatively balanced and stable microbial ecosystem, but in the human body, malnutrition, or because of taking this kind of antibiotics Microbial balance may be destroyed, facultative bacteria will be transformed into pathogens, leading to human diseases. Especially infants and young children often suffer after 3 months