食品科学 ›› 2011, Vol. 32 ›› Issue (1 ): 162-167.doi: 10.7506/spkx1002-6630-201101039

• 生物工程 • 上一篇    下一篇

唾液链球菌嗜热亚种Y-2细胞转化法制备γ–氨基丁酸

杨胜远1,陆兆新2,吕凤霞2,别小妹2   

  1. 1.韩山师范学院生物系食品与发酵工程研究所 2.南京农业大学食品科学技术学院
  • 收稿日期:2010-03-31 修回日期:2010-12-14 出版日期:2011-01-15 发布日期:2010-12-28
  • 通讯作者: 杨胜远 E-mail:yshengyuan2004@yahoo.com.cn
  • 基金资助:

    广东省自然科学基金项目(8452104101001546);国家星火计划项目(2008GA780032);韩山师范学院科研基金项目;国家“863”计划项目(2007AA10Z357)

Preparation of Gamma-Aminobutyric Acid Using Streptococcus salivarius subsp. thermophilus Y-2 Cells

YANG Sheng-yuan1,LU Zhao-xin2,LU Feng-xia2,BIE Xiao-mei2   

  1. 1. Food and Fermentation Engineering Institute, Department of Biology, Hanshan Normal University, Chaozhou 521041, China;
    2. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
  • Received:2010-03-31 Revised:2010-12-14 Online:2011-01-15 Published:2010-12-28
  • Contact: YANG Sheng-yuan1 E-mail:yshengyuan2004@yahoo.com.cn

摘要:

研究反应pH 值、反应温度、重金属盐、表面活性剂、底物浓度、菌体质量浓度和磷酸吡哆醛添加量对Streptococcus salivarius subsp. thermophilus Y-2 细胞转化法生产γ- 氨基丁酸的影响。获得反应体系的最佳组成为:湿菌体25g/L、BaCl2 40mmol/L、Triton X-100 体积分数0.02%、L- 谷氨酸单钠盐(L-monosodium glutamate,MSG)47.5g/L 和L- 谷氨酸(L-glutamic acid,L-Glu) 90.0g/L。该体系在40℃、pH 4.5 和搅拌速度100r/min 的最适转化条件下进行反应72h,转化液GABA 产量达到了(87.16 ± 4.33)g/L,细胞平均生产力为(48.42 ± 2.41)mg/(h·g),摩尔转化率为(97.60 ± 4.71)%。

关键词: 唾液链球菌嗜热亚种, 谷氨酸脱羧酶, γ–氨基丁酸, 生物转化

Abstract:

Theγ-aminobutyric acid (GABA) synthesis was conducted through biotransformation of Streptococcus salivarius subsp. thermophilus Y-2 cells to explore the effects of pH, reaction temperature, salts, surfactant, substrate concentration, strain concentration and addition of pyridoxal phosphate (PLP) on the production of GABA. Results indicated that the optimal reaction system included 25 g/L wet cells, 40 mmol/L BaCl2, 0.02% Triton X-100, 47.5 g/L L-monosodium glutanate, and 90.0 g/L L-glutamic acid. The optimal reaction conditions of this reaction system were reaction temperature of 40 ℃, reaction pH of 4.5, stirring speed of 100 r/min and reaction time of 72 h. Under these optimal conditions, the yield of GABA was up to (87.16 ± 4.33) g/L and biotransformation rate of GABA in moles was (97.60 ± 4.71)%. The total productivity of the cells was (48.42 ± 2.41) mg/(h·g).

Key words: Streptococcus salivarius subsp. thermophilus, glutamate decarboxylase, γ–aminobutyric acid, biotransformation

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