2004 Volume 15 Issue 1

N-Alkoxyl Templates for Diastereoselective Pyrrolidine Synthesis
Song Qing WANG , Omar A. ffiRAHIMI , Pan LI , Kang ZHAO
2004, 15(1): 1-4
[Abstract](167) [FullText HTML] [PDF 1537KB](0)
Abstract:
Intramolecular cyclization of N-alkoxyl amines are studied for the stereoselective preparation of 2, 4-disubstituted pyrrolidine derivatives. Reduction of oximes under acidic conditions by NaBH3CN afforded the corresponding nucleophilic hydroxylamine derivatives, which subsequently cyclized via SN2'mechanism to give the desired N-alkoxyl pyrrolidines.
Synthesis of Large-ring Cycloalkanediones from Bis-Grignard Reagent and Dinitriles
Bing Qin YANG , Ju Li JIANG , Yin Juan BAI , Jun LU , Zhen SHI
2004, 15(1): 5-6
[Abstract](161) [FullText HTML] [PDF 747KB](1)
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1, 6-Cyclododecanedione and 1, 8-cyclotetradecanedione were prepared from bis-Grig-nard reagent and dinitriles. This is a convenient synthetic method for large-ring cycloalkanediones.
Novel Analogues of α-Terthienyl, Thienyl 1, 3, 4-Thia(oxa)diazoles as Potential Photoactivated Insecticides: Synthesis and Bioactivity
Li Gang LIU , Yu Fang XU , Xu Hong QIAN , Qing Chun HUANG
2004, 15(1): 7-10
[Abstract](158) [FullText HTML] [PDF 1678KB](0)
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Novel 1, 3, 4-thia(oxa)diazoles containing thienyl groups were synthesized. Analogous to the naturally-occurring compound, α-terthienyl, they can be photosensitized by ultraviolet light and showed phototoxicities against the 2nd instar larvae of southern armyworm (Pseudaletia separata Walker), they also showed photocleavage action to pBR322 DNA.
Synthesis and Characterization of C60-Containing Poly(ethylene oxide)
Zhen LI , Pin SHAO , Xi YANG , Jing Gui QIN
2004, 15(1): 11-13
[Abstract](160) [FullText HTML] [PDF 812KB](0)
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C60-Containing poly(ethylene oxide) (PEO) was synthesized by a new method. Molecular structural characterization for the polymers was presented by 1H-NMR, infrared and UV-Vis spectra.
Synthesis of 2-Alkyl(aryl)-3-methylthio-6-methyl-6-arylpyrano-[4, 3-c] pyrazol-4(2H)-ones
Yu Xin LI , You Ming WANG , Xiao Ping YANG , Su Hua WANG , Zheng Ming LI
2004, 15(1): 14-16
[Abstract](157) [FullText HTML] [PDF 1001KB](0)
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The synthesis of 2-alkyl(aryl)-3-methylthiopyrano[4, 3-c]pyrazol-4(2H)-ones via 5, 6-dihydro-2H-pyran-2, 4-dione-3-dithioacetals with (un)substituted hydrazines is described and the mechanism of the formation of title compounds is discussed. Their structures were confirmed by 1HNMR spectra and elemental analysis.
Synthesis and Characterization of Ion-exchange Copolyimide
Li Rong ZHANG , Chun Qing ZHANG , Yan GAO , Zhi Yuan JIA
2004, 15(1): 17-18
[Abstract](163) [FullText HTML] [PDF 679KB](0)
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A new diamine, disodium 4, 4'-di(4-aminophenoxy)-3, 3'-disulfonate-1, 1'-diphenyl-ketone, was prepared from the nucleophilic substitution of disodium 4, 4'-difluoro-3, 3'-di-sulfonate-1, 1'-diphenylketone and p-aminophenol. Polymerization of this diamine and 4, 4'-diamino-1, 1'-diphenyl ether with 3, 3', 4, 4'-tetracarboxyl dianhydride-1, 1'-diphenyl ketone gave ion-exchange copolyimide. The new diamine and its polyimide were characterized with 1H-NMR and FT-IR.
Synthesis and In Vitro Antiviral Activities of Some New 2-Arylthiomethyl-4-tertiaryaminomethylsubstituted Derivatives of 6-Bromo-3-ethoxycarbonyl-5-hydroxyindoles
Dun WANG , De Sheng YU , Fang QIN , Lin FANG , Ping GONG
2004, 15(1): 19-22
[Abstract](161) [FullText HTML] [PDF 1566KB](0)
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Some new derivatives of 3-ethoxycarbonyl-6-bromo-5-hydroxyindoles were designed and prepared, their antiviral activity were determined in cell culture with virus cytopathic effect assay. The results showed compound Ⅶ b, Ⅶ h exhibited potential antiviral activity.
Synthesis and Antibacterial Activity of New Tetracyclic Triazolothiadiazino Fluoroquinolones
Guo Qiang HU , Zhong Quan ZHANG , Wen Long HUANG , Hui Bin ZHANG , Sheng Tang HUANG
2004, 15(1): 23-25
[Abstract](167) [FullText HTML] [PDF 1414KB](0)
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A series of novel 9-fluoro-10-(4-methylpiperazin-1-yl)-3-substituted-8-oxo-8H-[1, 2, 4] triazolo[3, 4-b]thiadiazino[6, 5, 4-ij]quinoline-7-carboxylic acids was prepared by a facile synthetic method and the in vitro antibacterial activity against Gram-postive (G+) and Gram negative (G-) bacteria was primarily evaluated.
Synthesis of Surface-active Substituted 3H-Indole Quaternary Ammonium Molecules
Tong Kuan XU , Xing Hai SHEN , Hong Cheng GAO
2004, 15(1): 26-28
[Abstract](162) [FullText HTML] [PDF 969KB](0)
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Two substituted 3H-indole quaternary ammonium molecules were designed and synthesized using hexamethylphosphoramide (HMPA) as a solvent. The products were purified and characterized by IR, 1H NMR, MS and elemental analysis.
Synthesis of A New Kind of Acetylenic Polysilazane
Ji Dong HU , Zhi Min ZHENG , Li Hua LIU , Zhi Jie ZHANG , Wei GAO , Ze Min XIE
2004, 15(1): 29-31
[Abstract](152) [FullText HTML] [PDF 1035KB](0)
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A new kind of conjugated polymer, acetylenic polysilazane was prepared by ammono-lysis of acetylenic dimethylchlorosilane. The polymer was characterized by 29Si、13C NMR and elemental analysis.
Synthesis and Catalytic Application of Chiral 1, 1'-Binaphthyl Polymers
Xu Dong LIU , Meng Xian DING , Lian Xun GAO
2004, 15(1): 32-34
[Abstract](725) [FullText HTML] [PDF 1107KB](0)
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The synthesis of a new type of polymers with main chain chirality based on BINOL skeleton is described. Titanium-BINOLate catalysts are easily generated from these polymers and applied to the asymmetric reaction of Et2Zn with benzaldehyde. The products are obtained in good yields with moderate enantioselectivities.
Stereospecifical Preparation of (E)-α-Stannyl-1-alkenylphosphonates and their Application in Stille Reaction
Zheng Chang XIONG , Lu Ling WU , Xian HUANG
2004, 15(1): 35-36
[Abstract](166) [FullText HTML] [PDF 748KB](0)
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The palladium catalyzed hydrostannation of 1-alkenylphosphonates gives the (E)-α-stannyl 1-alkenylphosphonates 2 stereospecifically. Compounds 2 can occur Stille coupling reaction to afford α, β-disubstituted vinylphosphonates with the retention of the configuration.
Poly(ethylenimine)-grafted-poly[(aspartic acid)-co-lysine]: A Non-viral Polymer with Potential for DNA Delivery
Zhi YANG , Gu Ping TANG
2004, 15(1): 37-40
[Abstract](161) [FullText HTML] [PDF 1363KB](0)
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A biodegradable gene transfer vector, poly(ethylenimine)-grafted-poly[(aspartic acid)-co-lysine] has been developed by thermal polycondensation of aspartic acid and lysine, and branch poly(ethylenimine) (Mw less than 600) was grafted to the backbone. The polymer was characterized by 1H NMR. It appeared lower cytotoxity compared to poly(ethylenimine) (25KDa), which was quantified by MTT assay. Electrophoresis indicated that the polymer could retardate DNA at N/P ratio 1.2-1.8 (w/w). Transfection efficiency of the complexes was studied in NT2 cell lines. It was 1.5 fold higher than molecular weight PEI (Mw=25KDa).
A New Sesquiterpene Polyol Ester from Celastrus Angulatus
Ming Jian WU , Tian Zeng ZHAO , Yu Jun SHANG , Jing Guo FU , Hai Yan ZHANG
2004, 15(1): 41-42
[Abstract](164) [FullText HTML] [PDF 818KB](0)
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A new sesquiterpene polyol ester, angulatin D, has been isolated from the root bark of Celastrus angulatus. The chemical structure is elucidated on the basis of spectral analysis.
A New Lignan from Boschniakia himalaica
Li Hui LIU , Jian Xin PU , Jing Feng ZHAO , Shuang Xi MEI , Xiao Dong YANG , Yu Bo WANG , Hong Bin ZHANG , Liang LI
2004, 15(1): 43-45
[Abstract](173) [FullText HTML] [PDF 836KB](0)
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From the ethanol extract of the whole plant of Boschniakia himalaica Hook. f. et. Thoms, a new and two known lignans have been isolated and identified as 7-methoxypinoresino 1, pinoresinol 2, and pinoresinol-O-β-D-glucopyranoside 3 respectively. Their structures have been established by spectroscopic methods.
Three New Dammarane Glycosides from Gynostemma pentaphyllum
Xin LIU , Rong Min YU , Wen Luan HSIAO , Shou Xun ZHAO , Wen Cai YE
2004, 15(1): 46-48
[Abstract](161) [FullText HTML] [PDF 1127KB](0)
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Three new dammarane-type glycosides (1-3) had been isolated from the aerial part of Gynostemma pentaphyllum (Thunb) Makino. The structures of compounds 1-3 had been elucidated as 3β, 12β, 25-trihydroxy-20(S), 24(S)-epoxydammarane 3-O-β-D-glucopyranosyl (1→2)-β-D-xylo-pyranoside, 3β, 12β, 25-trihydroxy-20(S), 24(R)-epoxydammarane 3-O-β-D-glucopyranosyl (1→2)-β-D-xylopyranoside and 3β, 12β, 23β, 25-tetrahydroxy-20(S), 24(S)-epoxydammarane 3-O-β-D-glucopyranosyl (1→2)-β-D-xylopyranoside, respectively, on the basis of chemical and spectro-scopic methods.
Two New Iridoid Glucosides from Lagotis yunnanensis
Xiao Dong YANG , Jing Feng ZHAO , Shuang Xi MEI , Jian Xin PU , Hong Bin ZHANG , Liang LI
2004, 15(1): 49-51
[Abstract](173) [FullText HTML] [PDF 1051KB](0)
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Two new iridoid glucosides 1 and 2, 10-O-(3, 4-dimethoxy-(E)-cinnamoyl)catalpol and 10-O-(3, 4-dimethoxy-(Z)-cinnamoyl)catalpol, were isolated from Lagotis yunnanensis. Their structures were elucidated by spectroscopic methods.
Oldhamioside, A New Phenolic Glucoside from Daphniphyllum oldhamii
Zhi Yu SHAO , Da Yuan ZHU , Yue Wei GUO
2004, 15(1): 52-54
[Abstract](165) [FullText HTML] [PDF 1129KB](0)
Abstract:
Further phytochemical investigation of the ethyl acetate extract of the stem of Daphniphyllum oldhamii afforded a new phenolic glucoside, named oldhamioside 1, together with eleven known compounds, koaburaside 2, betulin, 28-hydroxyl-3-lupenone, pineresinol, syringaresinol, 4-O-methyl-cedrusin, narigenin, eriodictyol, apigenin, loureirin C, and asperuloside. The structures of new and known compounds were characterized by detailed spectroscopic analysis and comparison of their spectral data with reported values.
Segetoside L, A New Triterpenoid Saponin from Vaccaria segetalis
Zeng Hua XIA , Min Liang ZOU , Sheng Min SANG , Ai Na LAO
2004, 15(1): 55-57
[Abstract](161) [FullText HTML] [PDF 1066KB](0)
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A new triterpenoid saponin, named segetoside L, was isolated from the seeds of Vaccaria segetalis. On the basis of spectral data and chemical reaction, its structure was established as 28-O-β-D-glucopyranosyl-(1→6)-β-D-glucopyranosyl oleanolic acid 3-O-β-D-glucopyranosyl-(1→3)-[β-D-galactopyranosyl-(1→2)]-β-D-galactopyranoside.
Two New 9, 10-seco-Cycloartanes from the Seeds of Sphaerophysa salsula
Zhong Jun MA , Isao Fimi , Yutaka EBIZUKA , Xian LI
2004, 15(1): 58-60
[Abstract](156) [FullText HTML] [PDF 1111KB](0)
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Two novel compounds, named sphaerophyside SC and SD were isolated from the ethanolic extract of the seeds of Sphaerophysa salsula. The structures of the compounds were elucidated on the basis of the NMR data, especially the 2D NMR technique.
A New Biflavonoid from Stellera chamaejasme L.
Bao Min FENG , Yue Hu PEI , Hui Ming HUA
2004, 15(1): 61-62
[Abstract](182) [FullText HTML] [PDF 678KB](0)
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A new biflavonoid, stelleranol, was isolated from the roots of Stellera chamaejasme L.. Its structure was determined by the analysis of MS and NMR data, especially 2D NMR spectra.
A New Picrotoxane Type Sesquiterpene from Dendrobium densiflorum
Jian TANG , Qun Fang LIU , Jing Qiu DAI , Wei Min ZHAO
2004, 15(1): 63-64
[Abstract](160) [FullText HTML] [PDF 654KB](0)
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A new picrotoxane type sesquiterpene named dendrodensiflorol has been isolated from the stems of Dendrobium densiflorum. Its structure was identified on the basis of spectroscopic method.
A Novel Protoilludane Sesquiterpene from the Wood of Xanthoceras sorbifolia
Chao Mei MA , Norio NAKAMURA , As'ari NAWAWI , Masao HATTORI , Shao Qing CAI
2004, 15(1): 65-67
[Abstract](163) [FullText HTML] [PDF 1187KB](0)
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A protoilludane sesquiterpene (named xanthocerapene) was isolated from the wood of Xanthoceras sorbifolia Bunge. Its structure, including the relative configuration was established by spectroscopic and chemical methods.
Two New Pyrrolizidines from Ligularia lankongensis
Ai Min TAN , Yun Sen LI , Hong YANG , Zheng Tao WANG , Hong Ping HE , Mian ZHANG , Xiao Jiang HAO
2004, 15(1): 68-70
[Abstract](168) [FullText HTML] [PDF 1198KB](1)
Abstract:
Two new pyrrolizidines named lankongensisine A (1), B (2) were isolated from the roots of Ligularia lankongensis collected in Lijiang, Yunnan, and their structures were established by spectroscopic analysis.
Preliminary Study on the Dynamic Properties of PMVS Filled with Surface-treated Silica
Qiang ZHENG , Hong Guo HU , Xiao Le TAO
2004, 15(1): 71-73
[Abstract](164) [FullText HTML] [PDF 1076KB](0)
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Dynamic properties of polymethylvinylsiloxane (PMVS) filled with surface-treated silica (SiO2) were studied using an advanced rheometric expansion system (ARES). The results revealed that the coupling agent, bis (3-triethoxysilylpropyl) tetrasulfane (TESPT) exerted a pronounced effect on the storage modulus (G'), and the effect of TESPT involved a frequency-dependent relation.
The Dynamic Viscoelasticity of Polyethylene Based Montmorillonite Intercalated Nanocomposites
Hong Mei YANG , Qiang ZHENG
2004, 15(1): 74-76
[Abstract](175) [FullText HTML] [PDF 1125KB](0)
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The viscoelastic behavior of melts for two systems composed of intercalated nanocomposites based on low density polyethylene and 3 wt% loading of cetyltrimethyl-ammonium bromide modified montmorillonite was studied. The results obtained through examining the dynamic storage module G'and dynamic loss module G" values of the composite revealed that the dynamic viscoelastic properties of composite strongly depended on intercalation of polymer, and exhibited dramatically change with altering intercalation conditions. Only when modified montmorillonite content was about 3 wt%, the composite showed a trend of pseudo-solidlike at lower frequencies.
Effect of Different Organic Modifiers on the Tensile Properties of PVC/EVA/Montmorillonite Composites
Chao Ying WAN , Yong ZHANG , Yin Xi ZHANG
2004, 15(1): 77-79
[Abstract](160) [FullText HTML] [PDF 729KB](1)
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Poly (vinyl chloride)/ethylene-vinyl acetate/montmorillonite (PVC/EVA/OMMT) composites were prepared by melt blending method. Two kinds of montmorillonites were organically modified by trimethyloctadecyl ammonium and dimethyl bis (hydrogenated tallow) ammonium, respectively. The morphology and tensile properties of the resultant composites were discussed in terms of the modifier type and OMMT content. The PVC/EVA/OMMT composites have intercalated structure, which is independent of the polarity of the modifiers, while the tensile properties show strong dependence on the modifier type. The OMMT modified by polar modifier gives higher tensile ductile and strength of PVC/EVA/OMMT composites.
Synthesis of Nickel Sulfide Particles by Solvothermal Process
Dun Qing WANG , Dai Rong CHEN , Xiu Ling JIAO
2004, 15(1): 79-82
[Abstract](155) [FullText HTML] [PDF 1609KB](0)
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Pyrite nickel disulfide and millerite nickel monosulfide have been successfully prepared by solvothermal method based on the reaction of Ni(NO3)2·6H2O and H2NC(S)NH2 in benzene and ethylenediamine (EDA). The final products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM). The effects of the solvent, reaction temperature and time on the morphology and phase of the products have been discussed.
Removal of Heavy Metals in Effluent by Adsorption and Coagulation
Feng Ting LI , Xia LI , Bing Ru ZHANG , Qing Hua OUYANG
2004, 15(1): 83-86
[Abstract](161) [FullText HTML] [PDF 1267KB](0)
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The silicate colloids with an average diameter 100 nm, were prepared by the hydrolysis of tetraethoxysilane (TES), NH4OH (30%) and then modified by (3-mercaptopropyl) trimethoxysilane ( APS). The colloids can adsorb heavy metals such as Pb and Cr in effluent and after adsorption the colloids can be separated by coagulation of aluminum sulfate. The removal of heavy metals is up to 99%.
Synthesis and Ionic Conductivity of Network Polymer Electrolytes with Internal Plasticizers
Jun Jie KANG , Shi Bi FANG
2004, 15(1): 87-89
[Abstract](164) [FullText HTML] [PDF 1188KB](0)
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Network polymer electrolytes with free oligo(oxyethylene) chains as internal plasticizers were prepared by cross-linking poly(ethylene glycol) acrylates. The effects of salt concentration and properties of internal plasticizers on ionic conductivity were studied.
Urea Decomposition Method to Synthesize Hydrotalcites
Piao Ping YANG , Jian Feng YU , Tong Hao WU , Guo Zong LIU , Tae Sun CHANG , Dong Koo LEE , Deug Hee CHO
2004, 15(1): 90-92
[Abstract](165) [FullText HTML] [PDF 1104KB](0)
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The urea decomposition property at high temperature has been used to control the pH value in the synthesis of layer compounds. The hydrotalcites of Mg-Al and Ni-Al with high crystallinity were synthesized by using this property.
Influence of Addition of ZnO on Property of Fe2O3-K2O System Catalyst for Ethylbenzene Dehydrogenation to Styrene
Chang Xi MIAO , Ming SHAN
2004, 15(1): 93-96
[Abstract](145) [FullText HTML] [PDF 1573KB](0)
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The incorporation of ZnO into Fe2O3-K2O system increases its activity, enhances its moisture stability and mechanical strength. The origin of the enhancement in activity and moisture stability is discussed in the light of experimental results obtained by BET, XRD, XPS. It was found that the addition of ZnO to Fe2O3-K2O system strengthens the interaction between Fe2O3 and K2O, reduces the formation temperature of KFe11O17 at least by 50℃, and promotes the transformation of Fe3+ to Fe2+ further.
In Situ Fabrication of ZnS Semiconductor Nanoparticles in Layered Organic-inorganic Solid Template
Bao Lin ZHU , Xiao CHEN , Zhen Ming SUI , Li Mei XU , Chun Jie YANG , Ji Kuan ZHAO , Jie LIU
2004, 15(1): 97-100
[Abstract](171) [FullText HTML] [PDF 1304KB](0)
Abstract:
Ordered ZnS semiconductor nanoparticles were in situ synthesized in metal halide perovskite organic/inorganic layered hybrids (CnH2n+1NH3)2ZnCl4 (n=10 and 12) by reaction of their spin-casting films with H2S gas. Transmission electron microscopy, UV-vis spectroscopy and small-angle X-ray diffraction were used to characterize the morphology and the structure of formed nanoparticles. Obtained results indicate an effective way to incorporate functional inorganic nanoparticles into structured organic matrices.
A Kind of Electrode Enhanced the Electrochemiluminescence
Gui Hong YAN , Da XING , Shi Ci TAN
2004, 15(1): 101-104
[Abstract](182) [FullText HTML] [PDF 1535KB](0)
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Three kinds of platinum electrodes with different geometry were designed. The relation of the electrochemiluminescence (ECL) intensity with the geometry of these electrodes has been investigated. The optical character of these electrodes was directly studied by observation of ECL image and measurement of the ECL intensity. The results showed that the ECL not only concentrated on the edge of the electrode but also concentrated on the edge of holes, which contain in the electrode. The ECL intensity from Ru(bpy)3Cl2·6H2O on round electrode was about half of that on four-hole round disk electrode for a same concentration of Ru(bpy)3Cl2·6H2O, so the detection limit was improved to 10-18 mol/L Ru(bpy)3Cl2·6H2O on four-hole round disk electrode, three times higher than that on round disk electrode.
Ammonia Decomposition over Bimetallic Nitrides Supported on γ-Al2O3
Chun Shan LU , Xiao Nian LI , Yi Feng ZHU , Hua Zhang LIU , Chun Hui ZHOU
2004, 15(1): 105-108
[Abstract](170) [FullText HTML] [PDF 1782KB](0)
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A series of monometallic nitrides and bimetallic nitrides were prepared by temperature-programmed reaction with NH3. The effects of Co, Ni and Fe additives and the synergic action between Fe, Co, Ni and Mo on the ammonia decomposition activity were investigated. TPR-MS, XRD were also carried out to obtain better insight into the structure of the bimetallic nitride. The results of ammonia decomposition activity show that bimetallic nitrides are more active than monometallic nitrides or bimetallic oxides.
Adsorption Behavior of a Water-soluble Porphyrin at the Glass-water Interface as Studied by Synchronous Total Internal Reflection Fluorescence Spectroscopy
Min Na YAO , Yao Qun LI
2004, 15(1): 109-111
[Abstract](170) [FullText HTML] [PDF 1315KB](0)
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otal internal reflection fluorescence spectroscopy (TIRF) and synchronous scanning technique were combined to study the adsorption behavior of the meso-tetrakis (4-sulfonatophenyl) porphyrin (TPPS) at the glass-water interface without any surfactant. The pH dependence of synchronous fluorescence signal at the interface was analyzed. Both unprotonated (TPPS4-) and diprotonated (H2TPPS2-) forms of TPPS were observed at the interface. But the interface favored the adsorption of. The apparent estimated pKa2 value shifted from 5.00 in the bulk solution to 2.7 at the interface. STIRF provides a good technique to study multi-component systems at the interface.
Carboxymethyl-β-cyclodextrin for Chiral Separation of Amino Acids Derivatized with Fluorescene-5-isothiocyanate by Capillary Electrophoresis and Laser-induced Fluorescence Detection
Yu Yun CHEN , Wei WANG , Wei Ping YANG , Zhu Jun ZHANG
2004, 15(1): 112-114
[Abstract](150) [FullText HTML] [PDF 1057KB](0)
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A method using carboxymethyl-β-cyclodextrin(CM-β-CD) as selector for chiral separation of amino acids by capillary electrophoresis and laser-induced fluorescence detection was studied. Resolution was better than that obtained byβ-CD or HP-β-CD.
Effect of Rotation Rate on the Formation of Platinum-modified Polyaniline Film and Electrocatalytic Oxidation of Methanol
Qiu Hong LI , Lin NIU , Chang Qiao ZHANG , Feng Hua WEI , Hu ZHANG
2004, 15(1): 115-117
[Abstract](168) [FullText HTML] [PDF 1041KB](0)
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The oxidation of methanol was investigated on platinum-modified polyaniline electrode. Changes in the electrode rotation rates (Ω) during platinum electrodeposition remarkably affect the formation and distribution of platinum in the polymer matrix and consequently lead to different currents of methanol oxidation. The results show that platinum loading is proportional to rotation rates Ω1/2.
Anthracylmethyl Benzoazacrown Ether as Selective Fluorescence Sensors for Zn2+
Li Hua JIA , Xiang Feng GUO , Yuan Yuan LIU , Xu Hong QIAN
2004, 15(1): 118-120
[Abstract](168) [FullText HTML] [PDF 1153KB](1)
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A new benzoazacrown ether fluorescence sensor was synthesized with 9-anthrylmethyl chloride and benzoaza-15-crown-5 in CH3CN, which particularly shows a strong affinity for Zn2+. Its fluorescence quantum yield increase more than one order of magnitude and a red shift could be noticed when passing from the apolar to the polar solvent.
Capillary Electrophoretic Immunoassay with Laser-induced Fluorescence Detection for Interferon-gamma
Hua ZHANG , Hai Ming WEI , Wen Rui JIN
2004, 15(1): 121-122
[Abstract](168) [FullText HTML] [PDF 729KB](0)
Abstract:
Capillary electrophoretic immunoassay with laser-induced fluorescence detection for recombinant human interferon-gamma (IFN-γ) was established. The limits of detection for three forms of IFN-γare 6.9 ng/L, 5.7 ng/L and 5.0 ng/L, respectively.
The Study of One Carbon Unit Transfer from Imidazolidine to dUMP Analogue with ONIOM Theory
Chuan Song QI , Da Cheng FENG , Zheng Ting CAI
2004, 15(1): 123-126
[Abstract](171) [FullText HTML] [PDF 1519KB](0)
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ONIOM quantum mechanics method is used in this paper to study one-carbon unit transfer from imidazolidine to 6-aminouracil derivates. The computation results show that this reaction can be completed via three paths owing to the three different proton transfer modes. By calculation and analysis, we can find the direct proton transfer is the preferable pathway.
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