Page 97 - 《精细化工》2020年第3期
P. 97

第 37 卷第 3 期                             精   细   化   工                                  Vol.37, No.3
             202 0 年 3 月                             FINE CHEMICALS                                 Mar.    2020


              生物工程
                  吐温/缓冲液体系中酶法合成(R)-对氯环氧苯乙烷



                                                                       3
                                                          2
                                             2
                                1
                                                                                                2*
                                                                                   3
                       王婷婷 ,董文彦 ,胡   蝶 ,李   闯 ,胡博淳 ,邬敏辰
                 (1.  江南大学  药学院,江苏  无锡  214122;2.  江南大学  无锡医学院,江苏  无锡    214122;3.  江南大
                 学  生物工程学院,江苏  无锡    214122)
                 摘要:利用环氧化物水解酶突变体 PvEH1            Z4X4-59 制备了 (R)-对氯环氧苯乙烷〔(R)-pCSO〕。以 E. coli/pveh1 Z4X4-59
                 全细胞作为生物催化剂,在磷酸盐缓冲液体系(Na 2 HPO 4 -NaH 2 PO 4 ,  100  mmol/L,  pH=7.0)  中有效拆分 250  mmol/L
                 对氯环氧苯乙烷(rac-pCSO)制备(R)-pCSO(ee s > 99%)。随后,依据 6 种非离子型表面活性剂对 E. coli/pveh1          Z4X4-59
                 全细胞酶活力和对映选择性的影响,筛选吐温-20 作为最佳添加剂,构建并优化吐温-20/缓冲液反应体系。在最
                 优反应条件下,吐温-20 的添加量为 4%(体积分数),E. coli/pveh1          Z4X4-59 全细胞的添加量为 200 g/L,反应时间为
                 12 h,初始底物浓度显著提高至 800 mmol/L(123.7 g/L),获得(R)-pCSO 的 ee s 和产率分别为 99%和 45.7%(理论产
                 率为 50%),时空产率高达 4.71 g/(L·h)。反应体系放大至 100 mL 后,制备 4.5 g (R)-pCSO 的总收率为 36.3%。
                 关键词:环氧化物水解酶;动力学拆分;(R)-对氯环氧苯乙烷;吐温-20;生物工程
                 中图分类号:Q814.9; O624      文献标识码:A      文章编号:1003-5214 (2020) 03-0515-06



                                   Enzymatic synthesis of (R)-p-chlorostyrene
                                           oxide in Tween/buffer system


                                                             2
                                    1
                                                                                                  2*
                                                                        3
                                                    2
                                                                                    3
                      WANG Tingting , DONG Wenyan , HU Die , LI Chuang , HU Bochun , WU Minchen
                 (1. School of Pharmaceutical Science, Jiangnan University, Wuxi 214122, Jiangsu, China; 2. Wuxi School of Medicine,
                 Jiangnan University, Wuxi  214122,  Jiangsu, China;  3. School of Biotechnology, Jiangnan University, Wuxi  214122,
                 Jiangsu, China)
                 Abstract: Whole  cells  of  E. coli/pveh1 Z4X4-59  expressing a  Phaseolus vulgaris  epoxide  hydrolase  mutant
                 PvEH1 Z4X4-59  was  used  as  biocatalyst  to  catalyze  hydrolytic  kinetic  resolution  of  250  mmol/L  racemic
                 p-chlorostyrene oxide (rac-pCSO) in Na 2HPO 4-NaH 2PO 4 buffer system (100 mmol/L, pH=7.0) to prepare
                 (R)-p-chlorostyrene  oxide  [(R)-pCSO)  with  an  over  99%  enantiomeric  excess  (ee s). The effects  of six
                 nonionic  surfactants  on  the  activity  and  enantioselectivity  of  whole  cells  of  E. coli/pveh1 Z4X4-59  were
                 investigated. It was found that Tween-20 was the best reaction additive. Thus, a Tween-20/buffer system
                 was  constructed  and  optimized.  The  optimized  conditions  were  as  follows:  dosage  of  Tween-20  in
                 Tween-20/buffer system was 4% (volume fraction), dosage of whole cells of E. coli/pveh1 Z4X4-59  was 200 g/L,
                 and reaction time was 12 h. Under these conditions, the initial substrate concentration was significantly
                 increased to 800 mmol/L (123.7 g/L), (R)-pCSO with 99% ee s, 45.7% yield (theoretical yield 50%) and
                 4.71 g/(L·h) space-time yield was obtained. When the reaction system was amplified to 100 mL, the total
                 yield of 4.5 g (R)-pCSO was 36.3%.
                 Key words: epoxide hydrolase; kinetic resolution; (R)-p-chlorostyrene oxide; Tween-20; biological engineering


                                                                           [1]
                 环氧化物水解酶(epoxide hydrolases,  EHs, EC          或生成邻二醇 。手性纯环氧化物和邻二醇是药物、
                                                                                                       [2]
            3.3.2.x)可特异性催化外消旋(rac-)环氧化物动力                      精细化学品、农药和功能材料的重要中间体 。如
            学拆分或对映归一性水解,保留单一构型环氧化物                             (R)-对氯环氧苯乙烷(p-chlorostyrene oxide, pCSO)    [3]

                 收稿日期:2019-07-15;  定用日期:2019-09-09; DOI: 10.13550/j.jxhg.20190685
                 基金项目:中国博士后基金面上项目(2018M630522);江苏省研究生科研与实践创新计划项目(SJCX18_0641);江苏省青年基金项
                 目(BK20180622)
                 作者简介:王婷婷(1993—),女,硕士生。联系人:邬敏辰(1962—),男,教授,E-mail:biowmc@126.com。
   92   93   94   95   96   97   98   99   100   101   102