一年四季，人们都离不开奶制品，炎热的夏季，很多人更是以奶制品补充营养。其中酸奶是很受欢迎的一种，它以新鲜牛奶经有效消毒，加入乳酸发酵而制成。酸奶中乳糖、半乳糖、葡萄糖、多聚糖、肽、游离氨基酸、氨、游离脂肪酸、叶酸、香气化合物和其他微量元素较鲜奶有所增加， Throughout the year, people are inseparable from dairy products, the hot summer, many people are more dairy products to supplement nutrition. Among them, yogurt is a very popular one, which is made by freshly sterilized milk and added with lactic acid fermentation. Yogurt lactose, galactose, glucose, polysaccharides, peptides, free amino acids, ammonia, free fatty acids, folic acid, aroma compounds and other trace elements than milk increased,