低乳糖牛奶的工艺参数研究

研究了乳糖酶的特性及生产低乳糖牛奶的方法。乳糖酶(MaxilactL2000)水解的最适pH为6.6,最适温度为35℃,由于该温度亦是微生物生长的最适温度,故生产低乳糖牛奶的工艺参数定为6℃,以避免微生物对产品卫生质量的影响。通过实验及分析,确定工业化生产的最适条件是添加酶量为1.0‰,在6℃下水解20h。生产出的低乳糖牛奶,乳糖水解率达到70%以上,可以减少乳糖不耐受症状。

The paper studied the characteristics of lactase and a method for producing low lactase milk.Lactase(MaxilactL2000)can hydrolysis lactose with an optimal pH of 6.6and optimal temperature of 35℃.But the temperature is also the optimal g rowth temperature for microbe,so temperature of 6℃was selected in producing low lactose milk to avoid the microbial infection.Throug h the experiments and analysis,we determined the optimal condition for industralized manufacture as the following :the proportion of lactase to milk1.0‰,and the temperature6℃for twenty hours.The hydrolytic rate of lactose can be above70%.The low lactose that can spoil milk can reduce the clinic manifestation of lactose intolerance.