添加干酪乳杆菌的益生菌酸乳生产工艺条件的优化.doc

添加干酪乳杆菌的益生菌酸乳生产工艺条件的优化
药璐通讯作者: 陈历俊,chlj@
基金资助:国家科技部“863”计划(2011AA100903)
作者简介: 药璐(1987-),女,硕士,研究方向为食品生物化学工程与功能性食品
,2,闵伟红1,姜铁民2,陈历俊2,*
(,吉林长春 130118;
,北京 100076)
摘要:以添加干酪乳杆菌的益生菌酸乳代替传统的保加利亚乳杆菌和嗜热链球菌发酵的酸乳,采用单因素和正交试验设计,对影响酸乳生产工艺的的菌种配比、接种量、发酵温度及发酵时间等主要因素进行了优化组合试验,以发酵过程中及后熟24h后的pH、酸度变化,并结合后熟酸乳的质构测定、感官评分和活菌数为综合指标,通过极差分析和方差分析,确定最佳生产工艺条件。本试验最终确定的最佳生产工艺条件为:乳酸菌(嗜热链球菌:保加利亚乳杆菌=1:1):干酪乳杆菌=2:1,接种量3%,发酵温度40℃,发酵时间为9h,,硬度、稠度、、·s、·s,后熟24h后的酸度和活菌数也分别达到122°×1011cfu/mL。该试验方法所得到的最佳生产工艺参数真实可靠,具有实际意义。
关键词:干酪乳杆菌;酸乳;正交试验;优化
Optimizing the process conditions for the probiotic yogurt added with lactobacillus casei
Yao ,Min wei-hong1, JIANG tie-min2, CHEN li-jun2,*
(1. Jilin Agriculture University, Jilin Changchun 130118, China;
2. Beijing Sanyuan Foods Co., Ltd, Beijing 100076, China)
Abstract:Using the probiotic yogurt added with Lactobacillus casei in place of the traditional yogurt only including Lactobacillus bulgaricus and us thermophilus, and determine the optimum process conditions of main factors such as strains inoculating proportion, inoculation amount, fermentation temperature and fermentation time by using single factor
and orthogonal experiment. According to the changes of the pH and the acidity in the fermentation process and after ripening, and take the texture, the sensory score and the viable count of the probiotic yogurt into consideration, determined the optimum process conditions by the range analysis and variance analysis. The optimum process conditions were as follows : lactobacillus(us thermophilus : Lactobacillus bulgaricus=1:1): Lactobacillus casei =2:1, inoculation amount 3%, fermentation temperature 40℃, fermentation time 9h. In the optimum process conditions the sensory score of yogurt reached points, and firmness, consistency, cohesiveness and viscosity were 、·s、 and ·s respectively, the acidity and viable count als