三己精 在
Psychrobacter sp. TA144 lipase, recombinant, containing MPILPV sequence at N-terminal, apparent molecular mass: ca. 48000 Da 作用下,
以
乙腈 为溶剂,
生成 己酸
参考文献:
名称:
The hormone-sensitive lipase from Psychrobacter sp. TA144: New insight in the structural/functional characterization
摘要:
Cold-adapted esterases and lipases have been found to be dominant activities throughout the cold marine environment, indicating their importance in bacterial degradation of the organic matter. lip2 Gene from Psychrobacter sp. TA144, a micro-organism isolated from the Antarctic sea water, was cloned and over-expressed in Escherichia coli. The recombinant protein (PsyHSL) accumulated in the insoluble fraction from which it was recovered in active form, purified to homogeneity and deeply characterised. Temperature dependence of PsyHSL activity was typical of psychrophilic enzymes, with an optimal temperature of 35 degrees C at pH 8.0. The enzyme resulted to be active on pNP-esters of fatty acids with acyl chain length from C-2 to C-12 and the preferred substrate was pNP-pentanoate showing a k(cat) = 26.2 +/- 0.1 s(-1), Km = 0.122 +/- 0.006 mM and a k(cat)/K-M = 215 +/- 11 mM(-1) s(-1). The enzyme was strongly inhibited by Hg2+, Zn2+, Cu2+, Fe3+, Mn2+ ions and it resulted to be activated in presence of methanol and acetonitrile, with calculated C-50 values of 1.98 M and 0.92 M, respectively.The region surrounding PsyHSL catalytic site showed an unexpected homology with the human HSL Further, both enzymes are characterised by the presence of an extra N-terminal domain, which role in the human protein has been related to regulative function. To clarify the function of PsyHSL N-terminal domain, a 97 amino acids deleted version of the enzyme was produced in E. coli in soluble form, purified and characterised. This mutant was inactive towards all tested substrates, indicating the involvement of this region in the catalytic process. (C) 2010 Elsevier Masson SAS. All rights reserved.
[EN] GEL FORMULATIONS FOR ENHANCING THE EFFECT OF RADIOTHERAPY<br/>[FR] FORMULATIONS DE GEL POUR AMÉLIORER L'EFFET DE RADIOTHÉRAPIE
申请人:UNIV DENMARK TECH DTU
公开号:WO2016079331A1
公开(公告)日:2016-05-26
The present invention relates to a composition comprising: a. non-water soluble carbohydrates b. a contrast agent for imaging, wherein at least 60% of the contrast agent remains within 10 cm from the injection site after 24h, for use in local co-administration into a human or animal body, and wherein the composition is a liquid before administration into the human or animal body and increases in viscosity by more than 1,000 centipoise (cP) after administration.
本发明涉及一种包含以下成分的组成物:a. 非水溶性碳水化合物 b. 成像的对比剂,其中至少60%的对比剂在24小时后保持在注射部位10厘米范围内,用于在人体或动物体内局部共同给药,并且该组成物在给药前为液态,在给药后在粘度上增加超过1,000厘泊(cP)。
Selective Transformations of Triglycerides into Fatty Amines, Amides, and Nitriles by using Heterogeneous Catalysis
作者:Md. A. R. Jamil、S. M. A. Hakim Siddiki、Abeda Sultana Touchy、Md. Nurnobi Rashed、Sharmin Sultana Poly、Yuan Jing、Kah Wei Ting、Takashi Toyao、Zen Maeno、Ken‐ichi Shimizu
DOI:10.1002/cssc.201900365
日期:2019.7.5
The use of triglycerides as an important class of biomass is an effective strategy to realize a more sustainable society. Herein, three heterogeneous catalytic methods are reported for the selective one‐pot transformation of triglycerides into value‐added chemicals: i) the reductive amination of triglycerides into fatty amines with aqueous NH3 under H2 promoted by ZrO2‐supported Pt clusters; ii) the
使用甘油三酸酯作为生物质的重要类别是实现更可持续社会的有效策略。本文报道了三种将甘油三酸酯选择性单锅转化为增值化学品的非均相催化方法:i)在Z 2 O 2支撑的Pt团簇的促进下,在H 2下,NH 3水溶液将甘油三酸酯还原胺化为脂肪胺。ii)高二氧化硅H-β(Hβ)沸石在180°C催化的气态NH 3下甘油三酸酯的酰胺化;iii)在220°C下,由Hβ促进的甘油三酸酯和气态NH 3合成腈。这些方法广泛适用于各种甘油三酸酯(C 4 –C18个骨架)成相应的胺,酰胺和腈。
Preparation of Glycerol Carbonate Esters by using Hybrid Nafion-Silica Catalyst
作者:María J. Climent、Avelino Corma、Sara Iborra、Sergio Martínez-Silvestre、Alexandra Velty
DOI:10.1002/cssc.201300146
日期:2013.7
selectivity towards GCEs, were obtained using a Nafion–silica composite. A full reaction scheme has been established, and it has been demonstrated that an undesired competing reaction results in the generation of glycerol and esters derived from a secondary hydrolysis of the endocyclic ester group, which is attributed to water formed during the esterification reaction. The influence of temperature, substrate
Mechanistic study of the selective hydrogenation of carboxylic acid derivatives over supported rhenium catalysts
作者:Takashi Toyao、Kah Wei Ting、S. M. A. Hakim Siddiki、Abeda S. Touchy、Wataru Onodera、Zen Maeno、Hiroko Ariga-Miwa、Yasuharu Kanda、Kiyotaka Asakura、Ken-ichi Shimizu
DOI:10.1039/c9cy01404g
日期:——
(Re/TiO2) catalysts for selective hydrogenation of carboxylic acid derivatives have been investigated. Re/TiO2 promotes selective hydrogenation reactions of carboxylic acids and esters that form the corresponding alcohols, and of amides that generate the corresponding amines. These processes are not accompanied by reduction of aromatic moieties. A Re loading amount of 5 wt% and a catalyst pretreatment
研究了用于羧酸衍生物选择性加氢的TiO 2负载Re(Re / TiO 2)催化剂的结构和性能。Re / TiO 2促进形成相应醇的羧酸和酯以及产生相应胺的酰胺的选择性加氢反应。这些过程不伴随芳族部分的减少。5重量%的Re负载量和H 2进行的催化剂预处理在500°C的高温下,最佳的氢化工艺是获得最高催化活性的最佳选择。使用各种表征方法(包括X射线衍射(XRD),X射线吸收精细结构(XAFS),X射线光电子能谱(XPS)和扫描透射电子显微镜(STEM))的研究结果表明,负责催化加氢过程的物质具有亚纳米级至几纳米大小,平均氧化态高于0且低于+4。羧酸和/或其相应的醇的存在对于防止Re / TiO 2催化剂促进脱芳香化副产物的产生是至关重要的。虽然Re / TiO 2具有固有的氢化能力,可以将芳香环,羧酸,醇,酰胺和胺牢固地吸附在Re物种上,从而抑制了该过程。此外,已开发的催化体系被用于选择性氢化形成相应醇的甘油三酸酯。
Lipase-Catalyzed Synthesis of Fatty Acid Diethanolamides
作者:Kuan Ju Liu、Ahindra Nag、Jei-Fu Shaw
DOI:10.1021/jf0107858
日期:2001.12.1
Diethanolamides are nonionic emulsifiers widely used in industries such as cosmetics and as corrosion inhibitors. Candida antarctica lipase (Novozym 435) was used to catalyze the amidation of various fattyacids with diethanolamine. Contents of fattyacids, metal ions, and water affected the yields of diethanolamides. Hexanoic acid was the best substrate among all acyl donors. Yields of hexanoyl diethanolamide