食品科学 ›› 2018, Vol. 39 ›› Issue (16): 147-153.doi: 10.7506/spkx1002-6630-201816022

• 生物工程 • 上一篇    下一篇

发酵鹰嘴豆乳产γ-氨基丁酸乳酸菌的复合诱变选育

李?文1,2,董明盛1,*   

  1. (1.南京农业大学食品科技学院,江苏?南京 210095;2.徐州工程学院 江苏省食品资源开发与质量安全重点建设实验室,江苏?徐州 221111)
  • 出版日期:2018-08-25 发布日期:2018-08-17
  • 基金资助:
    国家自然科学基金面上项目(31371807);徐州工程学院培育项目(XKY2017123)

Improving γ-Aminobutyric Acid Production of Lactic Acid Bacteria in Chickpea Milk by Compound Mutagenesis

LI Wen1,2, DONG Mingsheng1,*   

  1. (1. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China; 2. Jiangsu Key Construction Laboratory of Food Resource Development and Quality Safe, Xuzhou University of Technology, Xuzhou 221111, China)
  • Online:2018-08-25 Published:2018-08-17

摘要: 采用复合诱变的方式提高乳酸菌发酵鹰嘴豆乳产γ-氨基丁酸(γ-aminobutyric acid,GABA)的能力,为开发富含GABA的功能性食品打下基础。以植物乳杆菌M-6作为出发菌株,分别进行紫外、紫外-氯化锂复合诱变,确定紫外照射最佳时间为240 s,氯化锂最佳质量分数为1.25%。采用谷氨酸钠(monosodium glutamate,MSG)平板法、纸层析法、berthelot比色法和高效液相色谱法对突变株的产GABA特性进行检测,筛选到21?株GABA产量高于出发菌株的菌株,其中紫外-氯化锂诱变所得突变株UL-4产量最高,在MRSG培养基(含1%?MSG)和鹰嘴豆乳(含0.2%?MSG)里的产量分别为899.27?mg/L和369.53?mg/L,比出发菌株分别提高64.25%和30.46%,具有良好的遗传稳定性。

关键词: 鹰嘴豆乳, 乳酸菌, γ-氨基丁酸, 复合诱变

Abstract: γ-Aminobutyric acid (GABA) production of lactic acid bacteria in chickpea milk was enhanced by compound mutagenesis, aiming to lay a basis for the development of functional foods rich in GABA. Ultraviolet (UV) irradiation and combined UV-LiCl were used for the mutagenesis of Lactobacillus plantarum M-6. The optimal UV irritation time was 240 s, and the optimal LiCl concentration was 1.25%. A total of 21 mutants with higher GABA production ability were screened out by paper chromatography, MRS plate with 138 g/L monosodium glutamate (MSG), berthelot colorimetry and high performance liquid chromatography (HPLC) determination. Among them, strain UL-4, obtained by combined UV-LiCl mutagenesis, exhibited the highest GABA production (899.27 mg/L in MRS fortified with 1% MSG and 369.53 mg/L in chickpea milk fortified with 0.2% MSG, which were increased by 64.25% and 30.46% as compared to those of the original strain, respectively). The strain had good genetic stability.

Key words: chickpea milk, lactic acid bacteria, γ-aminobutyric acid, compound mutagenesis

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