深海微生物酯酶BSE00077能够有效地水解拆分消旋乙酸苏合香酯,制备(R)-1-苯乙醇。优化的反应条件为50mmol×L^(-1)底物,10%体积分数的正庚烷作为溶剂,在p H 7.0和30℃条件下反应2h。经过优化后,目标产物(R)-1-苯乙醇的对映体过量值...深海微生物酯酶BSE00077能够有效地水解拆分消旋乙酸苏合香酯,制备(R)-1-苯乙醇。优化的反应条件为50mmol×L^(-1)底物,10%体积分数的正庚烷作为溶剂,在p H 7.0和30℃条件下反应2h。经过优化后,目标产物(R)-1-苯乙醇的对映体过量值超过99%,转化率超过30%。我们发现酯酶BSE00077也能够拆分不同酰基链长的1-苯乙醇酯,酰基链长会影响1-苯乙醇的对映体过量值。深海来源的酯酶BSE00077作为生物催化剂在工业上制备(R)-1-苯乙醇和其他手性化工产品具有很好的应用潜力。展开更多
Bacillus sp. DL-2 was isolated from the deep sea of the Western Pacific and further utilized as novel biocatalysts to efficiently asymmetrically hydrolyze (±)-1-phenylethyl acetate. After the optimization of hydr...Bacillus sp. DL-2 was isolated from the deep sea of the Western Pacific and further utilized as novel biocatalysts to efficiently asymmetrically hydrolyze (±)-1-phenylethyl acetate. After the optimization of hydrolytic reactions, chiral chemicals (R)1-phenylethanol and (S)-l-phenylethyl acetate were obtained with high optical purities (96% and 99.8%, respectively). Our research is about the asymmeric hydrolysis of (±)-1-phenylethyl acetate using whole-cell biocatalysts. In addition, the optical purity of (S)-l-phenylethyl acetate generated through the kinetic resolution of (±)-1-phenylethyl acetate using the whole-cells of Bacillus sp. DL-2 was the highest report so far. Using the whole cells of deep sea bacterium Bacillus sp. DL-2 as the biocatalysts is an enviromnentally friendly method and will play critical roles in industrial asymmetric synthesis.展开更多
文摘深海微生物酯酶BSE00077能够有效地水解拆分消旋乙酸苏合香酯,制备(R)-1-苯乙醇。优化的反应条件为50mmol×L^(-1)底物,10%体积分数的正庚烷作为溶剂,在p H 7.0和30℃条件下反应2h。经过优化后,目标产物(R)-1-苯乙醇的对映体过量值超过99%,转化率超过30%。我们发现酯酶BSE00077也能够拆分不同酰基链长的1-苯乙醇酯,酰基链长会影响1-苯乙醇的对映体过量值。深海来源的酯酶BSE00077作为生物催化剂在工业上制备(R)-1-苯乙醇和其他手性化工产品具有很好的应用潜力。
文摘环氧基是一个非常活跃的基团,它能与酶、蛋白质和核酸等生物分子发生反应形成共价键,有利于生物分子的固定化。经共价结合法固定化的酶其稳定性及重复使用性可得到显著提高。用环氧树脂ES-103B为载体采用共价结合法对海洋细菌Bacillus sp.DL-2的胞外蛋白酶进行固定化,经过单因素实验优化条件得出最优固定化条件为:p H 8.0的胞外蛋白酶溶液,25 g/L的ES-103B,45℃下反应8h。采用此最优条件下的固定化酶拆分(±)-乙酸苏合香酯制备出了e.e.p=97.5%的(R)-1-苯乙醇(产率为45.0%)和e.e.s=99.2%的(S)-乙酸苏合香酯(产率为83.9%)。该固定化酶拆分(±)-乙酸苏合香酯在重复使用8次后制备出的(R)-1-苯乙醇的e.e.p仍大于90%,且固定化胞外蛋白酶在4℃下具有较好的储存稳定性。
基金Supported by the Natural Science Foundation of Guangdong Province,China(No.2018A030313151)the Senior User Project of the Research Vessel KEXUE(No.KEXUE2018G05)+1 种基金the Priority Research Program of the Chinese Academy of Sciences(No.XDAl 1030404)the Scientific and Technological Project of the Ocean and Fishery from Guangdong Province,China(No.A201701C12).
文摘Bacillus sp. DL-2 was isolated from the deep sea of the Western Pacific and further utilized as novel biocatalysts to efficiently asymmetrically hydrolyze (±)-1-phenylethyl acetate. After the optimization of hydrolytic reactions, chiral chemicals (R)1-phenylethanol and (S)-l-phenylethyl acetate were obtained with high optical purities (96% and 99.8%, respectively). Our research is about the asymmeric hydrolysis of (±)-1-phenylethyl acetate using whole-cell biocatalysts. In addition, the optical purity of (S)-l-phenylethyl acetate generated through the kinetic resolution of (±)-1-phenylethyl acetate using the whole-cells of Bacillus sp. DL-2 was the highest report so far. Using the whole cells of deep sea bacterium Bacillus sp. DL-2 as the biocatalysts is an enviromnentally friendly method and will play critical roles in industrial asymmetric synthesis.
