化工进展

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磁性多孔微粒对脂肪酶的固定化

陶维红,杨立荣,徐 刚,邰玉蕾,王 立,吴坚平   

  1. 浙江大学化学工程与生物工程学系,浙江 杭州 310027
  • 出版日期:2011-07-05 发布日期:2011-07-05

Immobilization of lipase on magnetic porous microspheres

TAO Weihong,YANG Lirong,XU Gang,TAI Yulei,WANG Li,WU Jianping   

  1. Department of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China
  • Online:2011-07-05 Published:2011-07-05

摘要:

开发了以磁性多孔微粒作为载体固定化脂肪酶的方法,进行了载体的FTIRXRDSEMTEMBETTGAVSM等测定与分析,考察了固定化时间、酶载量和缓冲液pH值等因素对固定化酶在有机相中催化烯丙醇酮转酯化反应性能的影响。结果表明,制备的磁性微粒是以Fe3O4为磁核,呈现多孔,比表面积12.16 m2/g,平均孔径为171.7 nm,磁铁含量38%并为超顺磁性;在酶与载体质量比为11pH8.0及固定化时间6 h制得固定化酶的效果最佳,固定化酶的活力回收率可达240%以其作为载体制备获得固定化酶操作稳定性得到显著提高,重复利用30批次后残余活力为74.5%,而游离酶7批次后仅为37.1%

Abstract:

The immobilization of Arthrobacter sp. lipase on magnetic porous microspheres was investigated. The magnetic porous microspheres was characterized with FTIRXRDSEMTEMBETTGA and VSMand the effect of immobilization timepHand lipase amount on the catalytic performance of the immobilized lipase in an organic system was studied. The results showed that the core of microsphere was Fe3O4the surface was porousthe surface area of microsphere was 12.16 m2/gaverage pore diameter was 171.7 nmits magnetic content was 38% and it was super-paramagnetic. The optimal immobilization conditions were determined to be pH 8.0 with the lipase/carrier ratio of 1 to 1m/mand immobilization time of 6 h. The activity recovery was as high as 2.4 fold of the free lipase in the resolution of 4-hydroxy-3-methyl-2-2-propenyl-2-cyclopenten-1-one. Furthermorethe operational stability of the immobilized enzyme was greatly enhanced compared to the free enzyme. The residual activity was kept at 74.5% after 30 batch reactionswhile that of the free enzyme was just 37.1% after 7 batch reactions.

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