食品科学 ›› 2008, Vol. 29 ›› Issue (2): 271-274.

• 生物工程 • 上一篇    下一篇

乳酸片球菌抑菌物质细菌素的分离纯化

 李亚玲, 周志江, 韩烨, 王培, 丁成为, 白鹤   

  1. 天津大学化工学院; 天津大学农业与生物工程学院; 天津大学化工学院 天津300072; 天津300072;
  • 出版日期:2008-02-15 发布日期:2011-08-24

Extraction and Purification of Bacteriocin from Pediococcus acidilactici Strain

 LI  Ya-Ling, ZHOU  Zhi-Jiang, HAN  Ye, WANG  Pei, DING  Cheng-Wei, BAI  He   

  1. 1.School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;2.School of Agriculture and Bioengineering, Tianjin University, Tianjin 300072, China
  • Online:2008-02-15 Published:2011-08-24

摘要: 将乳酸片球菌接种于MRS培养基,37℃静置培养17h后产生抑菌物质细菌素。用三步法从培养液中分离纯化细菌素:首先根据细菌素在pH6.0时与菌体的吸附力最强,pH2.0时吸附力最弱,通过调节pH和离心来收集细菌素,然后经过SP Sepharose Fast Flow阳离子交换柱层析和Sephadex G-50凝胶层析进行纯化,最后细菌素的得率为0.19%,比活为5.17×104AU/mg,纯化了34.54倍。得到的细菌素样品通过Tricine-SDS-PAGE电泳出现清晰条带,大小约为4600D。

关键词: 细菌素, 分离, 纯化, Tricine-SDS-PAGE

Abstract: Fresh culture of Pediococcus acidilactici strain inoculated in MRS broth and cultivated under 37 ℃ for 17 h, the bacteriocin was extracted from the culture and purified by three steps:the pH mediated cell adsorption-desorption method, SP Sepharose Fast Flow ion-exchange chromatography and Sephadex G-50 gel filtration. The final yield of bacteriocin was 0. 19% and the specific activity was 5.17×104 AU/mg. The specific activity was increased by 34.54 fold. Tricine-SDS-PAGE showed that its molecular weight was about 4600 D.

Key words: bacteriocin, extraction, purification, Tricine-SDS-PAGE