水杨醛硫代卡巴腙及其Ni(Ⅱ)、Zn(Ⅱ)配合物的合成与表征

合成了水杨醛硫代卡巴腙配体及其金属镍、锌的配合物,所得化合物分别用元素分析、红外光谱、摩尔电导和电子光谱进行了表征,同时对配体进行了核磁共振氢谱和质谱表征,给出了化合物可能的结构.     

Hep27, a member of the short-chain dehydrogenase/reductase family, is an NADPH-dependent dicarbonyl reductase expressed in vascular endothelial tissue

Human Hep27 was originally isolated from growth-arrested HepG2 cells and identified as a member of the superfamily of short-chain dehydrogenases/reductases (SDR). Its substrate specificity has not been determined, but a cross-species comparison suggests that it occurs in widely divergent species, such as human, Cenorhabditis elegans, Drosophila and Arabidopsis thaliana. In this study, Hep27 was expressed as a His₆ fusion protein, and subjected to a substrate screen, using a compound library of SDR substrates, comprising steroids, retinoids, sugars and carbonyl compounds. Whereas no steroid dehydrogenase or retinoid activity was detected, it was found that Hep27 catalyzed the NADPH-dependent reduction of dicarbonyl compounds, like 3,4-hexanedione and 1-phenyl-1,2-propanedione with similar turnover numbers as DCXR (a mitochondrial dicarbonyl reductase/xylulose reductase). In contrast, Hep27 does not convert sugar substrates like xylulose or threose. Based on its substrate specificity and expression in endothelial tissues, it is suggested that Hep27 functions as a dicarbonyl reductase in enzymatic inactivation of reactive carbonyls, involved in covalent modification of cellular components. Received 16 January 2006; received after revision 28 February 2006; accepted 31 March 2006     

低浓度苯胺类化合物纳滤分离机理的浓差极化S-K模型验证

采用结合浓差极化理论的Spiegler-Kedem(S-K)模型进行苯胺类化合物纳滤过程中的溶质反射系数(σ)和溶质渗透系数(Ps)的计算,研究操作压力、溶质相对分子质量以及正辛醇/水分配系数对苯胺类化合物反射系数的影响;另外通过空间位阻模型计算出3种纳滤膜的孔径,并与实验测定值比较,研究纳滤分离过程中的分离机理.研究结果表明,操作压力和溶质相对分子质量与溶质反射系数具有相关性,纳滤过程中筛分作用为其主要的分离机理.     

Superstructure transformations from hexagonal to tetragonal microplates and nested two-dimensional nanonetworks

Design and synthesis of super-nanostructures have obtained increasing attention in nanotechnology. A series of superstructured-nanonetwork and nested-nano- network bismuth compounds have been developed recently based on lattice-directed topotactic transformation. Here we further develop some specific superstructures by transformation within different crystalline types, such as hexagonal BiI3 micro/nanoplates, tetragonal BiOI micro/ nanoplates and nested two-dimensional （2D） orthogonal Bi2S3 nanonetworks, based on the lattice matching between the product and precursor. The method offers a convenient and common route in synthesizing heterojunctions and bi-material nanostructures similarly.     

强极性化合物DMC及其杂质的HILIC分离方法研究

建立以亲水作用色谱法对强极性化合物甲基丙烯酰氧乙基三甲基氯化铵(DMC)及其杂质进行分离分析的方法.使用Sepax HP-Cyano和X-Bridge HILIC两种不同的亲水作用色谱柱,以乙腈和水为流动相进行梯度洗脱,高效快速地实现了DMC及其所含杂质的分离分析.通过这两种色谱柱,共可以分离出甲基丙烯酸二甲氨基乙酯(...     

杂多化合物在催化反应中的应用研究

本文分别从以下三个方面对杂多化合物的催化作用进行概括：1、主要应用在石油化工方面的烃类的烷基化和异构的酸催化功能;2、应用在配合氧化剂催化烯烃的环氧化反应和燃油脱硫氧化还原催化功能;3、在有机合成中的酯化反应方面的氧化还原催化功能.     

末端炔醇HC≡CC(OH)RR’与有机金属试剂反应研究进展

由于含过渡金属的有机共轭体系独特的分子结构,基本性质以及在合成材料、催化、医药等方面潜在的应用,有关这方面的研究引起了人们广泛的兴趣。本文阐述了以炔醇配体为有机源合成M=C类配合物及金属杂芳香化合物的国内外研究现状。     

酶解奶油香精基料中特征风味组分分析研究

利用固相微萃取-气相色谱-嗅觉辨别法和风味值分析法对酶解奶油香精基料中特征风味组分进行研究.结果表明:嗅觉辨别法检测得到18种可被评价员嗅觉检测且与GC-MS分析结果对应的化合物;同时根据化合物在样品中的含量以及其相应的平均嗅闻阈值,分析了酶解产物中24种主要挥发性风味化合物的风味值.并且两种分析方法得到的特征风味化合物种类相同的有13种,但两种方法分析得到的同种风味组分在样品中的风味强度差别较大.综合气相色谱-嗅觉辨别法和风味值分析结果,酶解奶油香精基料中特征风味组分主要为:丁酸、己酸、辛酸、癸酸、己酸乙酯等.     

电热再生法脱附高沸点有机溶剂的研究

运用电热再生法研究吸附了不同沸点、不同分子量的挥发性有机溶剂（VOCs）异辛烷、甲苯、N,N-二甲基甲酰胺、甲基丙烯酸正丁酯的活性炭纤维的再生效果,考察了再生温度对活性炭纤维再生效率的影响.结果表明：再生温度低于VOCs沸点时,VOCs在活性炭纤维中难被脱附;相同再生条件下,长链状分子结构VOCs气体比较难从活性炭纤维中脱附出来;当再生温度高于200℃时,活性炭纤维吸附性能随再生次数增多而明显下降.     

电热再生法脱附高沸点有机溶剂的研究

运用电热再生法研究吸附了不同沸点、不同分子量的挥发性有机溶剂(VOCs)异辛烷、甲苯、N,N-二甲基甲酰胺、甲基丙烯酸正丁酯的活性炭纤维的再生效果,考察了再生温度对活性炭纤维再生效率的影响.结果表明:再生温度低于VOCs沸点时,VOCs在活性炭纤维中难被脱附;相同再生条件下,长链状分子结构VOCs气体比较难从活性炭纤维中脱附出来;当再生温度高于200℃时,活性炭纤维吸附性能随再生次数增多而明显下降.