Determination of Dopamine in the Presence of Ascorbic Acid on the IrO2-Ta2O5 Type DSA Electrode

IrO2Ta2O5 (70%: 30%, molar ratio) electrodes (ITEs) were prepared by the thermal decomposition method. Typical “mud-cracked” surface and surface enrichment of Ta were observed. The determination of dopamine (DA) was carried out in the presence of ascorbic acid (AA). The detection limit of DA was 5~10 5 mol/L without the interference of AA.     

New Type High Efficient Quasi-Solid-State Ionic Liquid Electrolyte for Dye-Sensitized Solar Cells

For the fist time the preparation of a mostly solid-state high efficiem electro-conductive material comprising 1-methyl-3-propylimidazolium iodide （MPII）, benzimidazole （BI）, iodine and lithium iodide was reported. In this electrolyte, BI acts as not only additives but also gelators. With its significant electrochemical properties, an overall efficiency of 3.07% was achieved under AM 1.5 （100 mW/cm^2）.     

Synthesis of porphyrin nitrogen mustards with potential anti-tumor activities in chemotheraphy and photodynamic therapy

2,7,12,18-Tetramethyl-13,17-di[3'-N,N'-di(2"-chloroethyl)aminopropyl]porphin and it's 3,8-di(1'-alkyloxyethyl)-analogous or porphyrin-nitrogen mustards were synthesized for the first time Their structures were determined by spectroscopics and elemental analyses.Most of the compounds possess both the chemotherapeutic and photodynamic effects on tumor and deserve further investigation.     

Study of Tea Digitized Chromatographic Fingerprint Spectra Using Micellar Electrokinetic Chromatography

IntroductionTeaisthemostwidelyconsumedbeverageinpeople’slife .Theheightenedpopularityofthisbeveragethroughouttheworldinrecentyearsmaybedueinparttotheevidenceofarelationshipbetweenteaconsumptionandpreventionofcertainformsofhumandisease .Themaincomponentsofteaarepolyphenoliccompounds ,commonlyknownascatechins ,whichrepresentagroupofcom poundsbelongingtotheflavonoidfamily .Thesecom poundsarewidelydistributedinthetealeavesandconsti tuteupto 30 %ofthedryleafweight.1Muchinteresthasbeenfocusedoncat…     

A Novel Total Synthesis of (±)Shikonin

Shikonin 1 was a key component isolated from the traditional Chinese herbal medicine, Zicao(Lithospermum erythrorhizon Sieb.et Zucc), which possesses multiple biological activities1. There have been many synthetic routes to shikonin, however, all these ro…     

大孔吸附树脂处理含磺胺废水的研究

利用大孔吸附树脂处理含磺胺废水。实验表明，DRHⅢ树脂对磺胺具有良好的吸附－解吸效果。原废水中磺胺浓度约为17.2g/L,COD约为13750mg/L，经树脂吸附处理后，废水中COD去除率约86％，磺胺的吸附率88．2％，树脂的解吸率为97．5％，磺胺的回收率约86．0％，其纯度达99．8％。在废水有效处理的同时实现了废物资源化，具有良好的环境效益和较高的经济效益。     

Preparation of Co3O4 Nanofibers via an Electrospinning Technique

Thin PVA/cobalt acetate composite fibers were prepared by using sol-gel processing and electrospinning technique.After calcination of the above precursor fibers,Co3O4 nanofibers with a diameter of 50-150 nm could be successfully obtained.The fibers were characterized by SEM,FT-IR,WAXD,respectively.     

The electrooxidation behavior of bilirubin in DMF and DMF + H_2O mixed solvent

The electrooxidation of Bilirubin (BR) in N,N'-dimethylformamide (DMF) and DMF + H_2O mixed solvent is investigated by voltammetry techniques, in situ rapid scan thin layer spectroelectrochemistry and in situ ESR spectroscopy. The data reveal that the oxidation process of BR undergoes many stages, which are all sped up by the introduction of water. The species of bilirubin taking part in the reaction is found to be changed from BR in DMF into BR' in the mixed solvents and the anodic peak potential is shifted correspondingly from +0.58 V to +0.026-+0.35 V (vs. Ag/AgCl, 1.0 M KCl). Free radicals and the dimerization of them are observed during the oxidation.     

Synthesis,Structure and Adsorption of AlPO-21 Prepared by Co-template Method

IntroductionAlPO 2 1isatypeofmicroporousaluminophosphatepreparedbyFlanigenandco workersin 1982 ,andthestructurewasresolvedbySmithetal.1in 1984 .AlmostatthesametimePariseetal.2 preparedAlPO 2 1phasebyanotherrouteandresolvedthestructureindependently .Inthenextyear ,GaPO 2 1phasewasobtainedaswell.3Al thoughAl(Ga)PO 2 1phasespreparedindifferentwayspossesssimilarchannelsystem ,amongthemtherearestillsomedifferencesinlatticeconstants ,indicatingthatdiffer enttemplatemoleculescanaffectlocallythe…     

利用分子对称性简化天然有机产物合成设计的策略

本文综述了利用分子对称性简化天然有机产物合成设计的策略,讨论了具有下述四种对称性的分子的合成:一、对称中心和旋转对称轴;二、对称平面;三、潜在的对称性;四、局部的对称性。