河北大学学报(自然科学版) ›› 2016, Vol. 36 ›› Issue (4): 417-423.DOI: 10.3969/j.issn.1000-1565.2016.04.014

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玉米酒糟为主要氮源的Nisin生产菌株的诱变选育

张拴力1,扈士海2,崔云3,赵地顺3   

  • 收稿日期:2015-10-15 出版日期:2016-07-25 发布日期:2016-07-25
  • 作者简介:张拴力(1968—),男,河北栾城人,石家庄新宇三阳实业有限公司高级工程师,主要从事生物化工研究. E-mail:zslyx96@126.com
  • 基金资助:
    河北省科技计划项目(13272802D)

Mutating Lactococcus lactis for high-yield strain of Nisin using corn thick mash as main nitrogen source

ZHANG Shuanli1,HU Shihai2,CUI Yun3,ZHAO Dishun3   

  1. 1.General Labor Office, Shijiazhuang Xinyu Sanyang Industrial Co., Ltd, Shijiazhuang 051430, China; 2.Research and Development Office, Shijiazhuang Xinyu Sanyang Industrial Co., Ltd, Shijiazhuang 051430, China; 3.College of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China
  • Received:2015-10-15 Online:2016-07-25 Published:2016-07-25

摘要: 为使乳酸乳球菌适应玉米酒糟作为发酵生产乳酸链球菌素(Nisin)的主要氮源,首先对培养基进行了初步优化,发现在酒糟清液中加入蔗糖、酵母膏和磷酸氢二钾明显促进了乳酸乳球菌的生长.在此基础上,使用等离子体对乳酸乳球菌进行诱变处理,利用24方孔深孔板技术可实现对高产Nisin突变菌株的选择性筛选.结果表明,诱变菌株在只有5.0%存活率时,得到的正突变菌株可达26.2%.借助摇瓶发酵实验对其生产Nisin的发酵水平进行研究,发现有1株诱变选育菌株发酵Nisin的活性高达6 520 U/mL,并且其发酵能力比诱变起始菌株能力更强.

关键词: 乳酸链球菌素, 乳酸乳球菌, 常压室温等离子体诱变, 玉米酒糟

Abstract: Corn thick mash was used as main nitrogen source to produce Nisin.Firsty,the fermentation media were optimized by single factor experiment.The results indicated that the growth of Lactococcus lactis was obviously enhanced by adding sucrose,yeast extract and K2HPO4 to thick mash.As the starting strain,the strain was further treated by atmospheric and room temperature plasmas and quickly selected using 24 well culture plate.At a survival rate of 5%,the positive mutation rate of the Lactococcus lactis was found to be 26.2% evaluated by the comparison with the starting strain.The results from shake flask culture further confirmed that a positive mutant strains could produce 6 520 IU/mL Nisin.

Key words: Nisin, Lactococcus lactis, atmospheric and room temperature plasma(ARTP)mutation, corn thick mash

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