化工进展 ›› 2022, Vol. 41 ›› Issue (12): 6522-6530.DOI: 10.16085/j.issn.1000-6613.2022-0385

• 生物与医药化工 • 上一篇    下一篇

ZIF-8-戊二醛固定化细胞生产α-酮戊二酸

代静新1(), 宋伟1, 陈修来2, 刘立明2, 吴静1()   

  1. 1.江南大学生命科学与健康工程学院,江苏 无锡 214122
    2.江南大学食品科学与技术国家重点实验室,江苏 无锡 214122
  • 收稿日期:2022-03-13 修回日期:2022-04-28 出版日期:2022-12-20 发布日期:2022-12-29
  • 通讯作者: 吴静
  • 作者简介:代静新(1996—),男,硕士研究生,研究方向为制药工程。E-mail:1468763530@qq.com
  • 基金资助:
    国家自然科学基金面上项目(22178146)

ZIF-8-glutaraldehyde-immobilized cells to produce α-ketoglutaric acid

DAI Jingxin1(), SONG Wei1, CHEN Xiulai2, LIU Liming2, WU Jing1()   

  1. 1.School of Life Sciences and Health Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China
    2.State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, Jiangsu, China
  • Received:2022-03-13 Revised:2022-04-28 Online:2022-12-20 Published:2022-12-29
  • Contact: WU Jing

摘要:

为了提高表达L-谷氨酸氧化酶(LGOX)重组大肠杆菌的催化稳定性,本研究采用了沸石咪唑框架(ZIF-8)涂层和戊二醛(GA)交联的组合固定技术。确定了ZIF-8和GA的工艺参数以及固定化细胞的催化性能,并对固定化重组大肠杆菌催化L-谷氨酸生产α-酮戊二酸(α-KG)的稳定性展开了研究。当2-甲基咪唑、醋酸锌和戊二醛的添加量分别为240mmol/L、80mmol/L和50mmol/L时,固定化细胞(E.coli@ZIF-8-GA)的比活性和活性回收率分别达到33.4U/g和95.83%。结果表明,在重复使用10个批次后,E.coli@ZIF-8-GA转化生产α-酮戊二酸的产量仍能达到70.03g/L。与游离细胞相比,固定化细胞对温度和pH的耐受性均发生显著提高。

关键词: 固定化, 沸石咪唑框架, L-谷氨酸氧化酶, α-酮戊二酸, 稳定性

Abstract:

In order to improve the catalytic stability of recombinant Escherichia coli (E.coli) containing L-glutamate oxidase (LGOX), a combined immobilization technique of zeolite imidazole framework (ZIF-8) coating and glutaraldehyde (GA) cross-linking was used in this study. The process parameters of immobilized cells were determined and the stability of α-ketoglutarate (α-KG) produced by immobilized cells was studied. The specific activity and activity recovery of immobilized cells (E.coli@ZIF-8-GA) were reached 33.4U/g and 95.83%, respectively, when 2-methylimidazole, zinc acetate and glutaraldehyde were added at 240mmol/L, 80mmol/L, and 50mmol/L, respectively. The results showed that the yield of α-KG could still reached 70.03g/L after reusing immobilized cells for 10 batches, which meant the stability of free cells in the reaction was enhanced. Compared with free cells, the tolerance to temperature and pH of immobilized cells was significantly improved, which laid a solid foundation for the application of immobilized catalyst to producing α-KG.

Key words: immobilization, ZIF-8, L-glutamic acid oxidase, α-ketoglutaric acid, stability

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