A Mass Spectrometric Study of γ－Amino－group－containing Propyltriethoxysilanes

ＡＭａｓｓＳｐｅｃｔｒｏｍｅｔｒｉｃＳｔｕｄｙｏｆγ－Ａｍｉｎｏ－ｇｒｏｕｐ－ｃｏｎｔａｉｎｉｎｇＰｒｏｐｙｌｔｒｉｅｔｈｏｘｙｓｉｌａｎｅｓＬｉｎＪｉ－Ｍａｏ；ＨｕａｎｇＷｅｎ－Ｔａｏ；ＦａｎｇＬｉ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，Ｓｈ...     

Application of H－point Standard Additions Method in Fluorescence Analysis－Simultaneous Determination of α－Naphthol and β－Naphthol

ＡｐｐｌｉｃａｔｉｏｎｏｆＨ－ｐｏｉｎｔＳｔａｎｄａｒｄＡｄｄｉｔｉｏｎｓＭｅｔｈｏｄｉｎＦｌｕｏｒｅｓｃｅｎｃｅＡｎａｌｙｓｉｓ－ＳｉｍｕｌｔａｎｅｏｕｓＤｅｔｅｒｍｉｎａｔｉｏｎｏｆα－Ｎａｐｈｔｈｏｌａｎｄβ－ＮａｐｈｔｈｏｌＪｉｎｇＴｉａｎＨ...     

Syntheses of 3－Methyl－1－propyl－4－piperidoneand1－Methyl－3，7－dipropyl－3，7－diazabicyclo［3，3，1］nonan－9－one

Ｓｙｎｔｈｅｓｅｓｏｆ３－Ｍｅｔｈｙｌ－１－ｐｒｏｐｙｌ－４－ｐｉｐｅｒｉｄｏｎｅａｎｄ１－Ｍｅｔｈｙｌ－３,７－ｄｉｐｒｏｐｙｌ－３,７－ｄｉａｚａｂｉｃｙｃｌｏ［３,３,１］ｎｏｎａｎ－９－ｏｎｅＷＡＮＧＹｕ－ｈｕａｎ,ＷＡＮＧＧｕｏ－ｊｉａ,Ｚ...     

Off－line Two－Dimensional Gas Chromatography－Mass Spectrometry for Analysis of Essential Oil of Medicinal Herb──Use of Absorption Trap

Ｏｆｆ－ｌｉｎｅＴｗｏ－ＤｉｍｅｎｓｉｏｎａｌＧａｓＣｈｒｏｍａｔｏｇｒａｐｈｙ－ＭａｓｓＳｐｅｃｔｒｏｍｅｔｒｙｆｏｒＡｎａｌｙｓｉｓｏｆＥｓｓｅｎｔｉａｌＯｉｌｏｆＭｅｄｉｃｉｎａｌＨｅｒｂ──ＵｓｅｏｆＡｂｓｏｒｐｔｉｏｎＴｒａｐＭＡＸｕｅ－ｙ...     

STUDIES ON THE SYNTHESIS OF SESAMIN－GROUP LIGNANS V． A CONVENIENT METHOD FOR THE PREPARATION OF 2－ARYL－4－PHENYLOXAZOLES

ＳＴＵＤＩＥＳＯＮＴＨＥＳＹＮＴＨＥＳＩＳＯＦＳＥＳＡＭＩＮ－ＧＲＯＵＰＬＩＧＮＡＮＳＶ．ＡＣＯＮＶＥＮＩＥＮＴＭＥＴＨＯＤＦＯＲＴＨＥＰＲＥＰＡＲＡＴＩＯＮＯＦ２－ＡＲＹＬ－４－ＰＨＥＮＹＬＯＸＡＺＯＬＥＳ￥Ｃｏｒｒｅｓｐｏｎｄｅｎｔａｕｔｈｏｒ．２－ａｒｙｌ－４－ｐｈｅｎｙｌｏｘａｚｏｌｅｓ．Ｔｈｅｏｔｈｅｒｏｌｌｅｂｙｔｈｅｒｅａｃｔｉｏｎｏｆａ－ｍｅｔｈｙｌｐｈｅｎａｃｙｌｂｅｎｚｏａｔｅｗｉｔｈａｍｍｏｎｉｕｍａｃｅｔａｔｅｉｎｂｏｉｌｉｎｇａｃｅｔｉｃａｃｉｄｔｏｆｏｒｍａｆｕｔｕｒｅｏｆ２，４－ｄｉｐｈｅｎｙｌ－５ｍｅｔｈｙｌｏｘａｚｏｌｅａｎｄ２，４－ｄｉｐｈｅｎｙｌ－５－ｒｎｅｔｈｙｌｉｎｄｄａｚｏｌｅｂｏｔｈｉｎａｂｏｕｔ４０％ｙｉｅｌｄ，ｈｉｌｔｔｉｌｌｓｍｅｔｈｏｄｉｓａｐｐｌｉｃａｂｌｅｆｏｒｔｈｅｐｒｅｐａｒａｔｉｏｎｏｆ２－ａｒｙｌ－４－ｐｈｅｎｙｌｏｘａｚｏｌｅｓ．Ｂｙａｎａｌｏｇｙ，ｐｌｉｅｎａｃｙｌｂｅｎｚｏａｔｅｉｓａｌｌｏａｌｌｏｗｅｄｔｏｒｅａｃｔｗｉｔｈａｌｎｍｏｎｉｌｌｍａｃｅｔａｔｅｉｎｂｏｉｌｉｎｇａｃｅｔｉｃａｃｉｄ．Ａｍｉｘｔｕｒｅｏｆ２，４－ｄｉｐｈ     

Crystal Structure of 1 －Acetyl －2－［O－methylphenyl） phenyl－ thiophosphonyl］ Hydrazine

ＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅＯｆ１－Ａｃｅｔｙｌ－２－［Ｏ－ｍｅｔｈｙｌｐｈｅｎｙｌ）ｐｈｅｎｙｌ－ｔｈｉｏｐｈｏｓｐｈｏｎｙｌ］Ｈｙｄｒａｚｉｎｅ￥ＺｈａｎｇＬｉ－Ｊｕａｎ；ＬｉｕＸｉａｏ－Ｌａｎ；ＭｉａｏＦａｎｇ－Ｍｉｎｇ（Ｉｎｓｔｉｔｕｔｅ...     

Crystal Structure of 3－Methyl－9－（O，O－Diethylphosphoryl） Methyl－1，6，12－Trioxa－9－Aza－5－Germaspiro［4，7］Dodecan－2－One

ＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅｏｆ３－Ｍｅｔｈｙｌ－９－（Ｏ，Ｏ－Ｄｉｅｔｈｙｌｐｈｏｓｐｈｏｒｙｌ）Ｍｅｔｈｙｌ－１，６，１２－Ｔｒｉｏｘａ－９－Ａｚａ－５－Ｇｅｒｍａｓｐｉｒｏ［４，７］Ｄｏｄｅｃａｎ－２－Ｏｎｅ￥ＣｈｅｎＲｕ－ｙｕ；ＬｉｕＬｕ...     

Synthesis，Crystal Structure of N－Salicylidene－o－aminobenzoic Acid Dipyridine Copper（Ⅱ） Monohydrate

Ｓｙｎｔｈｅｓｉｓ，ＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅｏｆＮ－Ｓａｌｉｃｙｌｉｄｅｎｅ－ｏ－ａｍｉｎｏｂｅｎｚｏｉｃＡｃｉｄＤｉｐｙｒｉｄｉｎｅＣｏｐｐｅｒ（Ⅱ）ＭｏｎｏｈｙｄｒａｔｅＬｉＳｈｕ－Ｌａｎ；ＬｉｕＤｅ－Ｘｉｎ；ＭｅｎｇＦａｎ－Ｑｉｎ；Ｚｈ...     

Non－isothermalKineticsofThermalDecompositionReactionsofSchiffBaseComplexesofAminoAcidswithTranistionMetals（I）

Ｎｏｎ－ｉｓｏｔｈｅｒｍａｌＫｉｎｅｔｉｃｓｏｆＴｈｅｒｍａｌＤｅｃｏｍｐｏｓｉｔｉｏｎＲｅａｃｔｉｏｎｓｏｆＳｃｈｉｆｆＢａｓｅＣｏｍｐｌｅｘｅｓｏｆＡｍｉｎｏＡｃｉｄｓｗｉｔｈＴｒａｎｉｓｔｉｏｎＭｅｔａｌｓ（Ｉ）ＬＩＳｈｕ－ｌａｎ,ＬＩＵＤｅ－...     

Crystal Structure of O，O－Diethyl－α－（β－triphenylgermanyl）－propionoyloxy Methylphosphonate

ＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅｏｆＯ，Ｏ－Ｄｉｅｔｈｙｌ－α－（β－ｔｒｉｐｈｅｎｙｌｇｅｒｍａｎｙｌ）－ｐｒｏｐｉｏｎｏｙｌｏｘｙＭｅｔｈｙｌｐｈｏｓｐｈｏｎａｔｅＣｈｅｎＲｕ－Ｙｕ；ＭａｏＬｉ－Ｊｕａｎ；ＬｉｕＡｉ－Ｌｉｎ（Ｉｎｓｔｉｔｕｔｅｏ...     

In situ wiring of single molecules into an electrical circuit via electrochemical distance tunneling spectroscopy

The electrical conductance of single n-alkanethiol and alpha,omega-alkanedithiol molecules was measured via in situ distance tunneling spectroscopy in aqueous 0.1 M KOH solution. The statistical analysis of the conductance values show that the alpha,omega-alkanedithiol molecule trapped in the STM break junction can adopt two distinct geometries that result in "lower" and "higher" conductivity values. In contrast, n-alkanethiol molecules trapped in the junction show only a single conductivity value characteristic for a particular molecule. Furthermore, the "lower" conductivity value determined for alpha,omega-alkanedithiol is virtually identical to the electrical conductivity of the n-alkanethiol containing the same number of atoms in the backbone. Moreover when the STM tip is polarized to electrochemical potential preventing a chemical reaction between the terminal -SH group and Au, only "lower" conductivity values are observed for alpha,omega-alkaneditiols.     

In situ STM study of potential-dependent height change of a tetrathiafulvalene derivative embedded in alkanethiol self-assembled monolayers on Au(111)

Electroactive tetrathiafulvalene thiol islands embedded in an n-alkanethiol SAM matrix were studied under potential control using in situ scanning tunneling microscopy. Unlike previously studied stochastic switching, the apparent height of the island could be intentionally controlled in the present system by choosing the appropriate potential and the island size. The dependence of the height change on the potential and the size is explained as structural change of the island induced by the charging effect of the electroactive moiety.     

含脂肪链聚苯并咪唑的合成及其气体透过性能

对含脂肪链聚苯并咪唑的聚合反应进行了比较系统的研究，在此基础上，合成了一系列含脂肪链聚苯并咪唑．以甲酸为溶剂，在减压下，制备了聚合物的均质膜．对聚合物的气体选择透过性能进行了研究，并从化学结构与气体透过性能关系的角度进行了讨论，发现同一聚合物对不同气体的透过系数符合一般玻璃态聚合物的规津；增加柔性链段中亚甲基数目，可提高聚合物的气体透过系数，降低分离系数；刚性链段中引入柔性基因，可增大气体透过系数；温度升高，聚合物的气体透过系数提高，分离系数一般下降．     

基于电化学方法研究以铜和银为电极的对苯二甲酸单分子结电导

利用基于电化学跳跃接触的扫描隧道显微镜裂结法(ECSTM-BJ), 通过现场形成金属电极, 对以Cu和Ag为电极的对苯二甲酸单分子结电导进行了测量. 研究结果表明: 利用该方法对所有数据直接线性统计即可得到很好结果; 两种电极下都存在两套高和低电导值, 其中以Cu为电极的单分子结电导高低值分别为11.5和4.0 nS, 而以Ag为电极的单分子结电导分别为10.3和3.8 nS, 高值都约为低值的3倍, 且以Cu为电极的单分子结电导要略大于以Ag为电极的电导, 可归结于电极和分子的耦合不同造成的. 与同样条件下测量得到的烷基链羧酸单分子结电导只存在一套值相比,对苯二甲酸表现出两套电导值, 反应了分子内主链对分子结电导的影响.     

Biotinylated alginate immobilization matrix in the construction of an amperometric biosensor: application for the determination of glucose

The use of biotinylated alginate as an immobilization matrix of enzymes on the surface of the amperometric transducer is described herein. The model used is that of the well-established glucose detection. Several types of immobilization protocols were tested. In the exception of one protocol, biotin labeled glucose oxidase was shown to first require conjugation with avidin, before its immobilization onto a biotin-alginate gel matrix. The response of the biosensors to incremental additions of glucose, was measured by potentiostating the modified electrodes at 0.6 V/SCE. The permeability of the modified electrodes was thereafter measured by using rotating disk electrode (RDE) voltammetry with ferrocenemonocarboxylic acid as the electroactive probe.     

新的酰胺型开链冠醚的合成与性质

Simon在70年代开发了一类酰胺型开链冠醚,能选择性配位碱土金属离子并可作为中性载体制备离子选择性电极.由于酰胺型开链冠醚易于制备,因此受到人们广泛地重视.Vgtle等提出的“末端基”概念为开链冠醚的合成、设计起了重要的指导作用.前文报道2-甲氧基-1-氨甲基萘与三甘醇二碘化物在无水碳酸钠存在下于乙腈中反应得到双手臂的套索冠醚与碘化钠的配合物.X射线衍射晶体结构分析表明萘环上的甲氧基中的氧原子参加了与钠离子的配位,生成了扭曲的六边形双锥结构配合物.因此2-甲氧基-1-氨基萘可以作为开链冠醚的“末端基”.开链冠醚的合成路线是:     

Extraction of Au nanoparticles having narrow size distributions from within dendrimer templates

Here, we show that Au nanoparticles having diameters of less than 2.2 nm can be extracted from within the interior of PAMAM dendrimers using n-alkanethiol extractants. Extraction proceeds quickly, regardless of the size of the nanoparticle, the dendrimer generation, or the peripheral functionalization of the dendrimer. The extraction rate is fastest for the lowest generation dendrimers, the smallest nanoparticles, and the shortest chain-length n-alkanethiols. Other important results of this study include the following. First, within the accuracy of absorbance spectroscopy, the extraction yield is quantitative. Second, NMR and FT-IR spectroscopy indicate that after extraction the dendrimer remains in the aqueous phase and can be used to template additional metal particles. Third, the size and optical characteristics of the extracted nanoparticles are the same as the precursor dendrimer-encapsulated nanoparticles (DENs). Fourth, a 100-fold excess of n-alkanethiol molecules is required to prevent aggregation of DENs during extraction.     

The selectivity of electrosynthesised polymer membranes depends on the electrode dimensions: implications for biosensor applications

A biosensor selectivity coefficient defined for poly(o-phenylenediamine) electrosynthesised onto Pt microdisks and cylinders was unexpectedly found to change as the scale of the electrodes decreased, mainly due to enhanced permeability of a ubiquitous interference species in biological systems, ascorbic acid.     

Electrochemical characterization of pore formation by bacterial protein toxins on hybrid supported membranes

The interaction of pore-forming streptolysin O (SLO) with biomimetic lipid membranes has been studied by electrochemical methods. Phosphatidylcholine lipid vesicles were deposited onto gold electrodes modified with supporting layers of hexyl thioctate (HT) or thioctic acid tri(ethylene glycol) ester (TA-TEGE), and integrity and permeability of the resulting membranes were characterized by cyclic voltammetry and impedance spectroscopy. Both positively and negatively charged electrochemical probes, potassium ferrocyanide, hexaammineruthenium(III) chloride, and ferrocene carboxylic acid (FCA), were employed to evaluate their suitability to probe the membrane permeability properties, with FCA exhibiting ideal behavior and thus employed throughout the work. Fusion of vesicles incubated with SLO on the electrodes yielded membranes that showed a distinctive response pattern for FCA as a function of SLO concentration. A direct dependence of both the currents and peak separation of FCA in the cyclic voltammograms was observed over a concentration range of 0-10 hemolytic units (HU)/microL of the toxin. The interaction of SLO with preformed supported lipid membranes was also investigated, and much lower response was observed, suggesting a different extent of membrane-toxin interactions on such an interface. Nonionic surfactant Triton was found to disrupt the vesicle structure but could not completely remove a preformed membrane to fully restore the electrode response. The information reported here offers some unique insight into toxin-surface interactions on a hybrid membrane, facilitating the development of electrochemically based sensing platforms for detecting trace amounts of bacterial toxins via the perforation process.     

Electrochemical impedance spectroscopic measurements of FCCP-induced change in membrane permeability of MDCK cells

This study demonstrates a new electrochemical impedance spectroscopic (EIS) method for measurements of the changes in membrane permeability during the process of cell anoxia. Madin-Darby canine kidney (MDCK) cells were employed as the model cells and were cultured onto gelatin-modified glassy carbon (GC) electrodes. EIS measurements were conducted at the MDCK/gelatin-modified GC electrodes with Fe(CN)(6)(3-/4-) as the redox probe. The anoxia of the cells grown onto electrode surface was induced by the addition of carbonycyanide p-(trifluoromethoxy) phenylhydrazone (FCCP) into the cell culture, in which the MDCK/gelatin-modified GC electrodes were immersed for different times. The EIS results show that the presence of FCCP in the cell culture clearly decreases the charge-transfer resistance of the Fe(CN)(6)(3-/4-) redox probe at the MDCK/gelatin-modified GC electrodes, and the charge-transfer resistance decreases with increasing time employed for immersing the MDCK/gelatin-modified GC electrodes into the cell culture containing FCCP. These results demonstrate that the EIS method could be used to monitor the changes in the cell membrane permeability during the FCCP-induced cell anoxia. To simulate the EIS system, a rational equivalent circuit was proposed and the values of ohmic resistance of the electrolyte, charge-transfer resistance and constant phase elements for both the gelatin and the cell layers are given with the fitting error in an acceptable value. This study actually offers a new and simple approach to measuring the dynamic process of cell death induced by anoxia through monitoring the changes in the cell membrane permeability.