【摘 要】
：
Enantioselective transesterification of glycidol with vinyl butyrate as an acyl donor was investigated in the presence of Bacillus subtilis lipase(BSL2) as cata
【机 构】
：
Key Laboratory for Molecular Enzymology and Engineering,Department of Endocrinology,College of Life
【基金项目】
：
the Scientific Research Fund of Jilin University,China;国家自然科学基金;the Graduate Innovation Fund of Jilin University,China
论文部分内容阅读
Enantioselective transesterification of glycidol with vinyl butyrate as an acyl donor was investigated in the presence of Bacillus subtilis lipase(BSL2) as catalyst.Comparison studies demonstrate the advantage of ultrasound over the conventional shaking for the enzymatic reaction in non-aqueous media.The effects of reaction conditions(ultrasound power,temperature,water activity and pH) on the activity and enantioselectivity were also investigated.Under the optimum conditions,the synthetic activity of BSL2 was 2.95 μmol·min-1·mg-1 and the enantioselectivity(E value) was 52.2.Compared with conventional shaking,ultrasound made the synthetic activity and the enantioselectivity increase 9.5-fold and 1.4-fold,respectively.Furthermore,the repeated use of BSL2 for five cycles resulted in no obvious loss of enzyme activity,suggesting that the enzyme is stable under low power ultrasound conditions.
其他文献
The authors study the inverse problem of recovering damping coefficients for two coupled hyperbolic PDEs with Neumann boundary conditions by means of an additio
采用分子动力学方法研究了298.2 K、0.1 MPa下摩尔分数为0.1~0.6的苯对酸性1-乙基-3-甲基咪唑三氯化铝([Emim]Cl/Al Cl3)离子液体中离子的存在形式、相互作用、迁移扩散以及
为满足电能量计量计费系统领域日益增长的安全可靠性需求,提出了一种电能量计量计费容灾系统的结构模型,阐述了该方案下容灾平台的软件结构模型及各功能模块的实现。介绍了基
针对球磨机系统控制过程中存在的多变量、强耦合、模型时变性的特点,提出基于情感智能的内模控制方案,采用大脑情感学习模型(BEL模型)对球磨机模型进行在线辨识,根据辨识结果
ZnO nanofibers with an average diameter of about 90 nm were prepared by an electrospinning method combined with a calcination process.The as-electrospun nanofib
以MgCl_2-H_2O-C_4H_8O_2三元体系在不同温度下的溶解度相图为对象,采用Origin 9.1和MATLAB软件对该三元体系进行了相图可视化研究。Origin 9.1和MATLAB均可实现对该体系的三元立体渐变曲面相图和三元投影相图的绘制。其中,Origin 9.1版内嵌了绘制三元立体渐变曲面相图和三元投影相图的模块,简单的人机交互界面方便了科学工作者对三元相图的可视化呈现。采用MA
Docetaxel is a commonly-used anti-cancer chemotherapeutic agent given its efficacy in a large varlety of solid tumors. It is associated with various adverse eff
为了找出氯乙烯精馏过程中某个操作参数发生扰动时对其它操作参数的影响,利用Aspen Dynamics软件针对某工厂PVC生产装置实例,建立了氯乙烯精馏过程的动态模拟流程,以该流程为
为实现石油化工过程的全流程动态建模与仿真,需要面对多样、多变的管道网络拓扑结构,解决管道网络的实时计算问题,其中包括种类多样、数量巨大的各类管件的计算;需要处理管道
以制剂主要性能为考察指标,对润湿剂、分散剂、崩解剂、粘结剂及填料进行筛选,确定了60％百菌清水分散粒剂优惠配方.结果表明:优惠配方组成(以质量分数计):有效成分60％、润湿剂4