食品科学 ›› 2006, Vol. 27 ›› Issue (1): 47-50.

• 基础研究 • 上一篇    下一篇

超声波细胞破碎法检测嗜酸乳杆菌β-半乳糖苷酶活力的研究

赵瑞香,王大红,牛生洋,苏娟   

  1. 河南科技学院食品学院; 河南师范大学生命科学学院; 河南科技学院食品学院
  • 出版日期:2006-01-15 发布日期:2011-09-05

Study on Activity of β-galactosidase Produced by Lactobacillus acidophilus with Ultrasionic Cell-break Method

ZHAO Rui-xiang,WANG Da-hong,NIU Sheng-yang,SU Juan   

  1. Food College, Henan Institute of Science and Technology, .College of Life Science, Henan Normal University
  • Online:2006-01-15 Published:2011-09-05

摘要: 采用超声波破碎法对嗜酸乳杆菌A和B产生的β-半乳糖苷酶进行提取,并以邻硝基苯-β-D-半乳糖苷(ONPG)为底物测定了β-半乳糖苷酶的活力。通过单因素试验和正交试验,选出了超声波破碎的最佳工艺条件。实验表明,嗜酸乳杆菌A在工作时间7.6min,工作/间歇为28s/20s,温度36℃时,超声波对细胞的破碎效果较好,此条件下破碎后,A株产生的β-半乳糖苷酶活力为5.963μmolONP/L·min。嗜酸乳杆菌B在工作时间6.8min,工作/间歇为20s/20s,温度37℃时效果较好,产生的β-半乳糖苷酶活力为6.683μmolONP/L·min。因此,嗜酸乳杆菌具有较高产生β-半乳糖苷酶的能力。

关键词: 嗜酸乳杆菌, &beta, -半乳糖苷酶, 超声波细胞破碎

Abstract: The extraction of the β-galactosidase produced by La-A and La-B was studied with the ultrasonic cell-break method. Meanwhile, the activity of β-galactosidase was assayed with reagent ONPG as substrate.Through the single-factor experiment and orthogonal experiment, the optimum technology was chosen. The results showed that the optimum conditions on cell-break of La-A with the ultrasonic method were: work time 7.6s,work/terral time 28s/20s, and temperature 36℃ and B was work time 6.8s, work/intermission time 20s/20s, and temperature 37℃. In these conditions, the activity of β-galactosidase produced by La-A and La-B reached 5.963μmol ONP/L·min and 6.683μmol ONP/L·min respectively. Therefore, Lactobacillus acidophilus had higher activity of producing β-galactosidase.

Key words: Lactobacillus acidophilus; &beta, -galactosidase; the ultrasonic cell-break;