CNKI《中国期刊全文数据库》收录期刊
《中国核心期刊(遴选)数据库》收录期刊
《中文科技期刊数据库》收录期刊
研究报告

IPTG添加时机对大肠杆菌产α- 酮基丁酸的影响

展开
  • 1.天津科技大学生物工程学院,天津300457;2.代谢控制发酵技术国家地方联合工程实验室,天津300457
李 娟(1992—),女,湖北襄阳人,硕士研究生,研究方向为谷氨酸棒杆菌色氨酸生产菌株的构建,E-mail:2546922910@qq.com.

Effects of IPTG addition time on fermentation of α-ketobutyric acid in Escherichia coli

Expand
  • 1.College of Biotechnology,Tianjin University of Science and Technology,Tianjin 300457,China;
    2.National and Local United Engineering Lab of Metabolic Control Fermentation Technology,Tianjin 300457,China

摘要

探究IPTG不同添加时间对大肠杆菌Escherichia coli THRD/pWSK29-ilvA 发酵生产α-酮基丁酸菌体生长、产酸、代谢副产物和耗糖的影响.摇瓶发酵结果表明:在菌体处于对数生长中后期,菌体OD600值为10~15时,添加IPTG进行诱导,菌体生物量相对较高为6.5g/L,α-酮基丁酸积累量最高达到16g/L,同时糖酸转化率较其他诱导时间高,且副产物乙酸含量明显降低.利用7.5L发酵罐对此诱导条件进行发酵验证,α-酮基丁酸质量浓度为22g/L,高于已有报道中8g/L的生产水平.

本文引用格式

李 娟,齐俊生,王 婷,毛 倩,韩 超,李燕军 . IPTG添加时机对大肠杆菌产α- 酮基丁酸的影响[J]. 发酵科技通讯, 2017 , 46(2) : 77 -82 . DOI: 10.16774/j.cnki.issn.1674-2214.2017.02.003

Abstract

The study investigated the effect of IPTG addition time on theα-ketobutyric acid   producing strain Escherichia coli THRD/pWSK29-ilvA in the aspects of cell growth,   productivity,byproducts formation and sugar consumption.The results indicated that when   IPTG was supplemented after the OD600reached 10to 15,the biomass reached as high as 6.5g/L with the titer ofα-ketobutyric acid 16g/L.The glucose/acid conversion ratio was the highest   compared to other groups with different IPTG addition time,and the acetic acid concentration   decreased significantly.The optimized IPTG induction time was applied in a 7.5Lfermentor,
and the results showed that the titer ofα-ketobutyric acid reached 22g/L,higher than previously
reported results.
文章导航

/