ab Initio Calculation on Tautomerism of Pyrazolin—5—ones

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Crystal structure and luminescence property of ternary terbium p-aminobenzoic acid complexes with different second ligands

Ternary terbium complexes with p-aminobenzoic acid (HL), [TbL₃(DMSO)(H₂O)]₂ (1), [TbL₃(DMF)(H₂O)]₂ (2) and [TbL₃(Bpy)(H₂O)]₂·2H₂O (3) (DMSO=dimethyl sulfoxide, DMF=N, N- dimethylformamide, Bpy=2, 2′- bipyridyl) have been synthesized, and their crystal structures determined. The luminescence properties of these complexes, including both the emission quantum yield and the fluorescence lifetime, have been investigated. The effect of a second ligand on the crystal structure and luminescence property of the ternary terbium p-aminobenzoic acid complexes, and the relationship between luminescence properties and crystal structure, including coordination mode of the L⁻ ligand and the characteristics of a second ligand, are discussed.     

Study on the immobilization of anti-IgG on Au-colloid modified gold electrode via potentiometric immunosensor, cyclic voltammetry, and electrochemical impedance techniques

The immobilization of anti-IgG on Au-colloid modified gold electrodes has been investigated. A cleaned gold electrode was first immersed in a mercaptoethylamine (AET) solution, and then gold nanoparticles were chemisorbed onto the thiol groups of the mercaptoethylamine. Finally, anti-IgG was adsorbed onto the surface of the gold nanoparticles. Potentiometric immunosensor, cyclic voltammetry, and electrochemical impedance techniques were used to investigate the immobilization of anti-IgG on Au colloids. In the impedance spectroscopic study, an obvious difference of the electron transfer resistance between the Au-colloid modified electrode and the bare gold electrode was observed. The cyclic voltammogram tends to be more irreversible with increased anti-IgG concentration. Using the potentiometric immunosensor, the proposed technique is based on that the specific agglutination of antibody-coated gold nanoparticles, averaging 16 nm in diameter, in the presence of the corresponding antigen causes a potential change that is monitored by a potentiometry. It is found that the developed immunoagglutination assay system is sensitive to the concentration of IgG antigen as low as 12 ng mL(-1). Experimental results showed that the developed technique is in satisfactory agreement with the ELISA method, and that gold nanoparticles can be used as a biocompatible matrix for antibody or antigen immobilization.     

Isoelectric focusing nonporous silica reversed-phase high-performance liquid chromatography/electrospray ionization time-of-flight mass spectrometry: a three-dimensional liquid-phase protein separation method as applied to the human erythroleukemia cell-line

A liquid-phase three-dimensional protein separation method has been developed that is used to separate the cytosolic fraction of a HEL cell lysate via isoelectric focusing (IEF), nonporous silica (NPS) reversed-phase high-performance liquid chromatography (RP-HPLC) and electrospray ionization time-of-flight mass spectrometry (ESI-TOFMS), respectively. Several hundred unique protein molecular weights were observed in a pI range from 4.8 to 8.5 and a mass range from 5 to 85 kDa. Proteins were positively identified by analysis of the pI (+/-0.5 pI units), an intact protein molecular weight (+/-150 ppm), and peptide mass mapping results. Using the molecular weight (MW) and peptide mapping results of identified proteins it was possible to characterize their posttranslational (PTMs) and/or sequence modifications. PTMs were detected on both forms of cytosolic actin, heat shock 90 beta, HINT and alpha-enolase. Sequence modifications or conflicts were observed for beta-and gamma-actin, ATP beta-synthase and heat shock 90 beta. IEF-NPS-RP-HPLC/ESI-TOFMS was used to determine experimental pI, MW and relative hydrophobicity values for each protein detected. This data was used to generate a 2-D pI-MS protein map, where proteins are displayed according to their pI and molecular weight. Protein molecular weight peaks are represented as bands in the 2-D pI-MS image where the gray scale of each band is proportional to the intensity of the protein molecular weight peak. In addition, a third hydrophobicity dimension (%B) was added as the % acetonitrile elution to generate a 3-D pI-MS-%B plot where each protein can be tagged according to three parameters.     

两次双波长分光光度法同时测定钴、镍、铜

本文用两次双波长分光光度法实现了三组分混合体系的同时测定。结果表明,两次双波长测量信号△A_1和△A_2的线性组合与混合体系中各组分浓度呈线性关系。该法用于钻、镍、铜三组分同时测定,定量结果令人满意。     

硅胶负载钯催化剂对丙烯酸甲酯的催化加氢性能研究

本文报导一种新法制备的硅胶负载钯催化剂,其活性组份大部分负载于载体的表面。该催化剂在常温常压下对丙烯酸甲酯的液相加氢反应,即有很高的活性和良好的重复使用性能。 催化剂按下法制备:在圆底烧瓶中加入1.00g硅胶和20mL甲醇,抽真空置换出硅胶孔内的空气,在搅拌下加入一定浓度的吸附质(聚乙烯亚胺、正丙胺、正丁胺等),在25℃反应3—4小时,过滤,固体经甲醇充分洗涤后和一定浓度的氯化钯甲醇溶液反应6小时。过     

毛细管电泳在拮抗药物对氨基苯甲酸、对羟基苯甲酸和磺胺分析测定中的应用

本文报道了一种用毛细管区带电泳法(CZE)分离与测定对氨基苯甲酸、对羟基苯甲酸及磺胺类药物的新方法.电泳条件为:用 20mmol/L硼砂-20mmol/L H_3PO_4-20 mmol/Lβ-环糊精-4％乙醇(pH 7.0)作电泳液,L-抗坏血酸为内标,280nm为检测波长,样品由电进样方式(10kV/10s)引入毛细管(51.2 cm×50μm i.d.,有效分离长度为 38.5 cm).在24.5°C下,6 min内三者可达基线分离(电泳电压 25kV),且在一定范围内可进行定量分析,保留时间(Tr)及A_(样品)/A_(内标)的RSD值分别小于1.0％和5.0％.本法的建立为研究这三者共存于高等动物及微生物体内时的生理作用提供了一种可共选择的新方法.     

水滑石焙烧产物Mg（Al）O为载体的Pt催化剂的正己烷临氢反应性能

制备了以水滑石焙烧产物－Ｍｇ－Ａｌ复合氧化物为载体的Ｐｔ催化剂，并考察了它在氢存在下的烃类转化反应性能，表明此类催化剂具有比一般的Ｐｔ／Ａｌ２Ｏ３更好的正己烷脱氢环化和异构化反应活性和选择性，更低的氢解反应活性。分别制备了以Ｈ２ＰｔＣｌ６、Ｐｔ（ＮＨ３）４（ＯＨ）２和Ｐｔ（ＮＨ３）４Ｃｌ２为浸渍剂的催化剂，其中以用Ｐｔ（ＮＨ３）４Ｃｌ２和Ｐｔ（ＮＨ３）４（ＯＨ）２制备的催化剂的脱氢环化反应和异构化     

金属有机化合物的分析（Ⅷ）：氢硼酸金属有机络合物的反相色谱机理

本文研究了具有特殊结构的氢硼酸金属有机络合物的反相色谱及机理。在MicropakC_(18)柱上,加入含离子试剂的甲醇-水作为流动相,通过用电导法测定流动相电性能,Break-through法测定离子试剂在固定相上的吸附量及制备色谱法研究各流分组成,认为此类化合物的保留机理为动态离子交换过程。     

Relationship between the molybdenum phases and the conversion of n-butane over Mo/HZSM-5

The conversion of n-C₄H₁₀ was undertaken on MoO₃/HZSM-5 catalyst at 773–973 K and the phases of molybdenum species were detected by XRD. The XRD results show that bulk MoO₃ on HZSM-5 can be readily reduced by n-C₄H₁₀ to MoO₂ at 773 K and MoO₂ can be gradually carburized to molybdenum carbide above 813 K. The molybdenum carbide formed from the carburization of MoO₂ with n-C₄H₁₀ below 893 K is -MoC_1−x with fcc-structure, while hcp-molybdenum carbide formed above 933 K. During the evolution of MoO₃ to MoO₂ (>773 K) or the carburization of MoO₂ to molybdenum carbide (>813 K), deep oxidation, cracking and coke deposition are serious, in particular at higher reaction temperatures, these lead to the poor selectivity to aromatics. Aromatization of n-C₄H₁₀ can proceed catalytically on both Mo₂C/HZSM-5 and MoO₂/HZSM-5, the distribution of the products for the two catalysts is similar below 813 K, but the activity for Mo₂C/HZSM-5 is much higher than that for MoO₂/HZSM-5.