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利用改性载体固定化大肠杆菌产琥珀酸

梅佳军,张常青,刘嵘明,马江锋,陈可泉,姜 岷   

  1. 南京工业大学生物与制药工程学院,材料化学工程国家重点实验室,江苏 南京 211816
  • 出版日期:2013-01-05 发布日期:2013-01-05

Succinic acid production with immobilized cells of Escherichia coli on modified carrier

MEI Jiajun, ZHANG Changqing, LIU Rongming, MA Jiangfeng, CHEN Kequan, JIANG Min   

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, School of Biotechnology and Pharmaceutical Engineering, Nanjing University of Technology, Nanjing 211816, Jiangsu, China
  • Online:2013-01-05 Published:2013-01-05

摘要: 采用聚乙烯亚胺(PEI)和戊二醛(GA)对棉纤维进行化学修饰,考察了载体改性后的性能和对固定化大肠杆菌产丁二酸的影响。改性后的载体菌体负载量提高了63.3%。培养基中葡萄糖浓度为43 g/L,添加改性棉纤维120g/L,以MgCO3为缓冲盐,进行批式发酵,丁二酸浓度达到29.6 g/L,比未改性棉纤维提高了11.3%;丁二酸收率达到70.5%,比改性前提高了7.5%;丁二酸生产速率达到0.66 g/(L?h), 比改性前提高了37.5% 。对该材料固载的细胞进行7次重复批式发酵,丁二酸产量、转化率和产率没有下降趋势,具有一定的重复稳定性。

关键词: 琥珀酸, 固定化发酵, 载体改性, 吸附, 聚乙烯亚胺

Abstract: Immobilization of Escherichia coli on cotton fiber modified by polyethylenimine coating and glutaraldehyde crossing-linking for succinic acid production was investigated. Compared with unmodified cotton fiber, static cell adhesion increased by 63.3% after the carrier was modified by PEI and GA. When 43 g/L glucose was put in fermentation medium, 120 g/L PEI-GA cotton fiber was added, and MgCO3 was used as neutralizer in batch fermentation, concentration of scuccinic acid was 29.6 g/L, productivity was 0.66 g/(L?h)and yield was 70.5%, increased by 11.3%, 37.5% and 7.5%, respectively. The batch fermentation of immobilized cells on PEI-GA cotton fiber was repeated seven times. The concentration of scuccinic acid, yield and productivity did not decrease. It suggested that PEI-GA cotton fiber as immobilization carrier was suitable for scuccinic acid production by Escherichia coli AFP111.

Key words: succinic acid, immobilized fermentation, modified carrier, adhesion, polyethylenimine

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