生物技术通报 ›› 2015, Vol. 31 ›› Issue (7): 188-192.doi: 10.13560/j.cnki.biotech.bull.1985.2015.07.028

• 研究报告 • 上一篇    下一篇

酸性α-淀粉酶菌株的筛选及其发酵条件研究

屈建航1, 尹伊1, 焦国宝2, 丁长河1, 张倩1, 屈凌波1, 刘仲敏2   

  1. (1. 河南工业大学生物工程学院,郑州 450000;2. 河南仰韶生化工程有限公司,渑池 472400)
  • 收稿日期:2014-11-25 出版日期:2015-07-16 发布日期:2015-07-16
  • 作者简介:屈建航,女,博士,研究方向:微生物学;E-mail:qjh_bata@163.com
  • 基金资助:
    国家科技支撑计划项目(2013AA102101),国家自然科学面上基金项目(31370147),河南省高校青年骨干教师资助计划(2013GGJS-077),河南省高校科技创新团队(15IRTSTHN019)

Screening of a Strain Producing Acid-stable α-Amylase and Optimization of Its Fermentation Condition

Qu Jianhang1, Yin Yi1, Jiao Guobao2, Ding Changhe1, Zhang Qian1, Qu Lingbo1, Liu Zhongmin2   

  1. (1. College of Biological Engineering,Henan University of Technology,Zhengzhou 450000;2. Henan Yangshao Biochemical Engineering Company,Mianchi 472400)
  • Received:2014-11-25 Published:2015-07-16 Online:2015-07-16

摘要: 自淀粉厂周边土壤分离筛选到一株高效耐酸α-淀粉酶菌株SH3,初步鉴定为酵母菌,发酵粗酶pH范围3.8-8.0,最适作用pH5.0,该酶在80℃下仍有酶活,最适作用温度50℃。经单因素发酵条件的研究与优化,最适温度37℃,培养基初始pH5.0,可溶性淀粉作碳源,蛋白胨为氮源,200 mL装液量。正交试验确定最佳产酶条件为可溶性淀粉15 g/L、蛋白胨30 g/L、37℃、pH4.5,该条件下酶活力为96.8 U/mg。

关键词: 耐酸α-淀粉酶, 菌株筛选, 发酵条件, 工艺优化, 酵母菌

Abstract: A strain SH3 producing acid-stable α-amylase was isolated from the soil nearing a starch factory. It was preliminarily identified as yeast. The pH range of crude enzyme reaction was 3. 8-8. 0 with the optimum of 5. 0, and the activity of the enzyme was still available in the temperature of 80℃ with the optimum of 50℃. The optimization of single-factor fermentation revealed that the optimal condition for the enzyme production was 37℃, pH 5. 0, soluble starch as carbon source, peptone as nitrogen source and 200 mL liquid volume. Orthogonal test showed that the optimal fermentation condition was as soluble starch of 15 g/L, peptone of 30 g/L, 37℃ and pH4. 5, under which the enzyme activity was 96.8 U/mg.

Key words: acid-stable α-amylase, strain screening, fermentation condition, process optimization, yeast