JOURNAL OF LIGHT INDUSTRY

CN 41-1437/TS  ISSN 2096-1553

Volume 32 Issue 2
March 2017
Article Contents
LIANG Guo-bin, ZHAI Liang-chuang, WANG Bin, et al. Preparation of immobilized halohydrin dehalogenase and the stability testing of catalytic systhesis ATS-5[J]. Journal of Light Industry, 2017, 32(2): 26-32. doi: 10.3969/j.issn.2096-1553.2017.2.005
Citation: LIANG Guo-bin, ZHAI Liang-chuang, WANG Bin, et al. Preparation of immobilized halohydrin dehalogenase and the stability testing of catalytic systhesis ATS-5[J]. Journal of Light Industry, 2017, 32(2): 26-32. doi: 10.3969/j.issn.2096-1553.2017.2.005 shu

Preparation of immobilized halohydrin dehalogenase and the stability testing of catalytic systhesis ATS-5

  • Received Date: 2016-06-07
    Available Online: 2017-03-15
  • The immobilization conditions of halohydrin dehalogenase (HHDH) by the sodium alginate were studied.The optimum conditions of immobilization process were as follows:sodium alginate concentration 3.5%, HHDH enzymatic amount 2.4×104 U/mL, glutaraldehyde concentration 1.00%, calcium chloride solution concentration 1.5% and immobilization time 2 h.Under the optimum immobilization conditions, the encapsulation efficiency of HHDH was 52.1%, the activity recovery of HHDH was 75.2%.After five batches of intermittent catalytic synthesis of (R)-4-cyano-3-hydroxybutyric acid ethyl (ATS-5), the residual activity of immobilized HHDH was 51.2%. After the continuous catalytic synthesis of ATS-5 for 10 d,the substrate conversion efficiency was 90.6%, the distillation purification yield of ATS-5 was 98.2%, the purity and optical purity of ATS-5 were 99.3% and 99.1%, respectively.No obvious activity loss was obtained for immobilized HHDH after 80 d storage at 4℃.
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