南京林业大学学报(自然科学版) ›› 2012, Vol. 36 ›› Issue (06): 90-94.doi: 10.3969/j.jssn.1000-2006.2012.06.018

• 研究论文 • 上一篇    下一篇

耐热α-葡萄糖苷酶的诱导条件及重组酶的固定化

裴建军,吕香香, 解静聪, 赵林果*   

  1. 1. 南京林业大学化学工程学院,江苏省生物质绿色燃料与化学品重点实验室,江苏南京210037
  • 出版日期:2012-11-30 发布日期:2012-11-30
  • 基金资助:
    收稿日期:2012-03-16修回日期:2012-09-04
    基金项目:国家自然科学基金项目(31070515);国家自然科学青年基金项目 (30900008);江苏高校优势学科建设工程资助项目(PAPD)
    第一作者:裴建军,讲师,博士。 *通信作者:赵林果,教授,博士。Email:lg.zhao@163.com。
    引文格式:裴建军,吕香香,解静聪,等. 耐热α-葡萄糖苷酶的诱导条件及重组酶的固定化[J]. 南京林业大学学报:自然科学版,2012,36(6):90-94.

Inducement condition and immobilization of thermostable αglucosidase produced by Escherichia coli

PEI Jianjun, L Xiangxiang, XIE Jingcong, ZHAO Linguo*   

  1. Jiangsu Key Lab of Biomass Based Green Fuels and Chemicals, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
  • Online:2012-11-30 Published:2012-11-30

摘要: 以构建重组菌(JM109/pBV-220-GLZ)作为耐热α-葡萄糖苷酶的生产菌株,研究了诱导温度、诱导时间以及重组菌生长的不同阶段对重组菌生产耐热α-葡萄糖苷酶的影响,并对诱导表达的重组酶进行了固定化研究。结果表明,最佳的诱导条件是:诱导温度为40 ℃,诱导时间为14 h,在重组菌D(600)为20时诱导的酶活最高。适宜的固定化条件为:海藻酸钠20 g/L, CaCl2 20 g/L,硬化时间2 h,前交联剂戊二醛的质量分数为10 %,该条件下的酶回收率高达81 %。制备的固定化酶有较好的储存稳定性和操作稳定性,重复操作15次后,酶活为初始酶活的75 %。

Abstract: Several factors influencing αglucosidase production with the recombinant Escherichia coli haroring the JM109/pBV220GLZ were investigated. The results showed that the best inducement conditions were as follows: induction temperature 40 ℃, induction time 14 h, and at OD600 of 2.0. To determine the optimum conditions of immobilization, the concentration of sodium alginate, CaCl2, and glutaraldehyde, and solidifying time were studied. The results showed that the optimum operations were: 20 g/L sodium alginate, 20 g/L CaCl2, 1.0 % glutaraldehyde, solidifying time 2 h. Under the optimum condition, the recovery rate reached 81 %. After 15 times repeated operations, the enzyme activity remained 75 %, showing good operational stability. Thus, the superior stability of the recombinant enzyme laid the base for largescale application.

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