高度对映选择性脂肪酶已广泛用于通过动力学或动态动力学拆分制备通用的对映纯手性仲醇。脂肪酶本质上是( R )-选择性的,很难获得( S )-选择性脂肪酶。VIII 族羧酸酯酶的最新晶体结构表明,其催化三联体的空间阵列是脂肪酶的镜像,但催化三联体不同于脂肪酶。因此,我们假设 VIII 族羧酸酯酶可能对类似于 ( S ) 的仲醇表现出( S )-对映选择性。)-选择性丝氨酸蛋白酶,其催化三联体也在空间上排列为它的镜像。在这项研究中,制备了一种已知家族 VIII 羧酸酯酶(pdb 代码:4IVK)的同源酶(来自变形杆菌SG_bin9 的羧酸酯酶,PBE),该酶不仅对3-丁炔等仲醇具有中等的 ( S )-选择性。-2-醇和1-苯乙醇以及( R )-对所探索的底物中特定仲醇的选择性。此外,(S)-PBE 的选择性已通过基于分子模型的合理重新设计显着提高。分子模型确定了一个由 Ser381、Ala383
MUCOUS LAYER-ADHESIVE POLY-r-GLUTAMIC ACID NANOMICELLES AND DRUG DELIVERY SYSTEM USING SAME
申请人:BIOLEADERS CORPORATION
公开号:US20160193348A1
公开(公告)日:2016-07-07
The present invention relates to nanomicelles composed of a complex of a lipophilic compound and a poly-gamma-glutamic acid wherein a portion of carboxyl groups are substituted with an amine group, and more particularly, to nanomicelles composed of a complex of a lipophilic compound and a poly-gamma-glutamic acid wherein a portion of carboxyl groups are substituted with an amine group, a preparation method thereof, and a drug delivery system employing the mucous membrane-adhesive property of the nanomicelles. According to the present invention, the nanomicelle drug delivery system based on poly-gamma-glutamic acid that is a natural biopolymer can be used for the delivery of a drug to mucous membranes to thereby increase the in vivo stability and effectiveness of the drug.
Preparation of Passion Fruit-Typical 2-Alkyl Ester Enantiomers via Lipase-Catalyzed Kinetic Resolution
作者:Hedwig Strohalm、Susanne Dold、Kathrin Pendzialek、Monika Weiher、Karl-Heinz Engel
DOI:10.1021/jf100432s
日期:2010.5.26
fruit-typical 2-alkyl esters by capillary gas chromatography using heptakis(2,3-di-O-methyl-6-O-tert-butyldimethylsilyl)-β-cyclodextrin as chiral stationary phase. An efficient method was developed to prepare the ester enantiomers via lipase-catalyzed esterifications: optically pure (R)-2-alkyl esters (ee > 99.9%) were obtained by esterification of the racemic alcohols with enantioselective Candida antarctica
研究了通过脂肪酶催化动力学拆分制备仲醇2-戊醇,2-庚醇和2-壬醇的酯对映体(乙酸,丁酸酯,己酸酯和辛酸酯)。通过庚烷(2,3-di- O -methyl-6)的毛细管气相色谱法,对这些百香果类典型的2-烷基酯的同源系列进行了追踪,考察了市售酶制剂催化的酯化和水解反应的转化率和立体化学过程。- ø -叔丁基二)-β环糊精作为手性固定相。开发了一种通过脂肪酶催化的酯化反应制备酯对映体的有效方法:光学纯(R通过用对映选择性南极假丝酵母脂肪酶B(固定化)作为催化剂将外消旋醇酯化,可得到)-2-烷基酯(ee> 99.9%)。随后使用来自假丝酵母的脂肪酶将未反应的醇酯化,得到光学富集的(S)-酯(ee> 81.4%)。通过使用硅胶和氧化铝(碱性)的混合物的液体固体色谱法分离产物,得到高化学纯度和产率(> 40mol%)。
ANTIMICROBIAL POLYMYXINS FOR TREATMENT OF BACTERIAL INFECTIONS
申请人:MICURX PHARMACEUTICALS, INC.
公开号:US20160185823A1
公开(公告)日:2016-06-30
The present invention provides antimicrobial polymyxin compounds of the following formula I:
or pharmaceutically acceptable salts, hydrates, or solvates thereof that are antibacterial agents, pharmaceutical compositions containing them, methods for their use, and methods for preparing these compounds.
An erasable image forming material includes a color former, a developer, a binder resin, and a polymer decolorizer having an electron donating group capable of physically or chemically adsorbing the developer. This polymer decolorizer is, e.g., a polymer compound having a sugar skeleton, representatively starch. This image forming material can form sharp images and erase images by heat or a solvent to achieve a good erased state.
Decolorable image forming material and decoloring method of the same
申请人:Kabushiki Kaisha Toshiba
公开号:EP1041447A1
公开(公告)日:2000-10-04
A decolorable image forming material containing a color former, a developer and a binder resin, in which the binder resin has a property that it is compatible with the color former when the material is in contact with a solvent and that it keeps the compatible state when the solvent is removed, or has a property that it shifts an equilibrium between the color former and the developer to a non-developed side when the temperature of the material is raised and that it keeps the state shifted to the non-developed side when the temperature of the material is lowered.