食品科学 ›› 2012, Vol. 33 ›› Issue (3): 105-109.doi: 10.7506/spkx1002-6630-201203023

• 生物工程 • 上一篇    下一篇

发酵豆制品中高产转氨酶菌株筛选及固态菌剂制备

伍 玲,秦礼康   

  1. 贵州大学生命科学学院
  • 出版日期:2012-02-15 发布日期:2012-02-14
  • 基金资助:
    贵州省科学技术基金项目(黔科合J 字[2007]2033 号);贵州省科技重大专项

Screening and Identification of Aminotransferase-producing Strain from Fermented Soybean Products and Preparation of Its Solid Starter Culture

WU Ling,QIN Li-kang   

  1. College of Life Sciences, Guizhou University, Guiyang 550025, China
  • Online:2012-02-15 Published:2012-02-14

摘要: 为缩短传统大豆发酵制品后熟期,基于转氨反应这一主要风味形成途径,现从贵州各地采集风味良好的豆豉、腐乳等发酵样品,经稀释涂布平板法分离得到150株细菌。通过支链氨基酸转氨酶活力测定,从中筛选出WDH-8菌株具有最高酶活力,菌种鉴定后确定其为地衣芽孢杆菌,属安全益酵菌株,其支链氨基酸转氨酶活力达36.53U/mL。为便于生产应用,对该菌株进行固态菌剂培养基配方实验,以转氨酶活力为指标,培养基最佳配方为:黄豆粉25g、水料比1:1(V/m)、氯化钠添加量5%、葡萄糖添加量3%,其酶活力达到37.965U/mL。

关键词: 大豆发酵, 转氨酶, 菌剂, 地衣芽孢杆菌

Abstract: In order to shorten the fermentation period of fermented soybean products, a total of 150 strains were isolated from top-quality fermented foods in Guizhou. Among these strains, strain WDH-8 was found to have the highest branched-chain aminotransferase activity. The strain was identified as Bacillus licheniformis that was a safe prebiotic yeast strain with a branched-chain aminotransferase activity of 36.53 U/mL. In order to facilitate practical applications, the preparation of its solid starter culture was investigated, and the optimal culture medium for achieving the highest branched-chain aminotransferase activity, 37.965 U/mL, was determined to be composed of soybean power 25 g, material-to-water ratio 1:1, sodium chloride 5% and glucose 3%.

Key words: soybean fermenting, aminotransferase, starter cultures, Bacillus licheniformis

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