食品科学 ›› 2010, Vol. 31 ›› Issue (15): 198-202.doi: 10.7506/spkx1002-6630-201015043

• 生物工程 • 上一篇    下一篇

鲜奶中产γ-氨基丁酸的乳酸菌株的筛选与鉴定

李远宏1,吕凤霞1,邹晓葵1,李 颖1 ,2,陆兆新1 ,*   

  1. 1. 南京农业大学食品科技学院
    2.无锡市宜兴食品药品监督管理局
  • 收稿日期:2009-10-28 修回日期:2010-06-03 出版日期:2010-08-15 发布日期:2010-12-29
  • 通讯作者: 陆兆新 E-mail:fmb@njau.edu.cn
  • 基金资助:

    国家“863”计划项目(2007AA10Z357)

Isolation and Screening of a Gamma-Aminobutyric Acid-producing Lactic Acid Bacterial (LCB) Strain from Fresh Milk

LI Yuan-hong1,LU Feng-xia1,ZOU Xiao-kui1,LI Ying1,2,LU Zhao-xin1,*   

  1. 1. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China;
    2. Yixing Food and Drug Administration, Yixing 214206, China
  • Received:2009-10-28 Revised:2010-06-03 Online:2010-08-15 Published:2010-12-29
  • Contact: LU Zhao-xin1,* E-mail:fmb@njau.edu.cn

摘要:

从新鲜牛奶中筛选高产γ- 氨基丁酸(GABA)的乳酸菌株fmbl12-4,通过形态特征、生理生化特征和16S rDNA 序列分析,鉴定菌株为乳酸乳球菌乳酸亚种(Lactococcus lactis subsp. lactis)。当fmbl12-4 的湿菌体与100mmol/L L- 谷氨酸钠溶液(L-MSG)按1:20(m/V)混合,于30℃、100r/min 振荡反应24h,转化液中GABA 浓度达到82.36mmol/L。在质量浓度为2.5g/100mL L-MSG 的MRS 培养基中培养6d,GABA 质量浓度达到4.68g/L。

关键词: γ-氨基丁酸, 乳酸菌, 筛选, 鉴定

Abstract:

A lactic acid bacterial strain with high γ-aminobutyric acid (γ-GABA)-producing ability, named fmbl12-4, was isolated from fresh milk. Based on the studies of morphological, physiological and biochemical characteristics and 16S rDNA sequence and phylogenic analyses, fmbl12-4 was identified as Lactococcus lactis subsp. lactis. After 24 h shake (100 r/min) incubation of the wet mycelia of fmbl12-4 in a 20-fold volume of 100 mmol/L L-monosodium glutamate solution at 30 ℃, aγ- GABA content of 82.36 mmol/L was obtained. Incubation in a MRS medium containing 25 g/L L-MSG for 6 days gave 4.68 g/L γ -GABA content.

Key words: γ-aminobutyric acid, lactic acid bacteria, isolation and screening, identification

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