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Electrochemical studies of 1,5-dihydroxynaphthalene as substrate for voltammetric enzyme immunoassay

Science China Chemistry 2004年第3期47卷 184-191页

作者： JIAO Kui yao hong xu Jin ZHANG Shusheng College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao 266042 China College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao 266042 China College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao 266042 China College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao 266042 China

A sensitive voltammetric enzyme immunoanalytical method is described for assay of horseradish peroxidase (HRP), labelled-HRP and antigen:antibody:labelled-HRP conjugate (Ag︰AB︰IgG-HRP) using 1,5-dihydroxynaphthalene (1,5-DHN) as substrate. 1,5-DHN is an electrochemical inactive substance, but it may be oxidized by O2 in air to 5-hydroxy-1,4-naphtho- quinone in basic solution, which produces a well-defined voltammetric reduction peak. After adding H2O2 and HRP, HRP catalyzes H2O2 oxidizing 5-hydroxy-1,4-naphthoquinone to 3-hydroxyphthalic acid, leading to the decrease of the voltammetric reduction peak, with which the activity of HRP and the labelled-HRP, further the antigen and antibody may be determined. The mechanism of this voltammetric enzyme-linked immunoassay system is different from the previous reports, in which there are no voltammetric reduction peaks before the addition of H2O2 and HRP, and the reduction peaks appear after the addition of H2O2 and HRP. The height of the voltammetric peak is directly proportional to the concentration of HRP in the previous systems, while the decrease of the voltammetric peak is linear with the concentration of HRP in this system. This new electrochemical method is combined with an indirect enzyme immunoassay using di-rect antigen-coating format for the detection of the purified tobacco mosaic virus (TMV) with a linear range from 25.0 to 340.0 ng/mL, and a detection limit 25.0 ng/mL.

关键词： 1,5-dihydroxynaphthalene, tobacco mosaic virus, horseradish peroxidase, enzyme immunoassay, voltammetry.

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Preparation and property of a novel soluble oxadiazole-containing functional polyacetylene

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Chinese Chemical Letters 2008年第2期19卷 141-145页

作者： hong yao xu Xin Wang Jin Cui Wu College of Materials and Engineering ＆ State Key Laboratory of Chemical Fibers and Polymeric Materials Modification Donghua University Shanghai 201620 China School of Chemistry and Chemical Engineering Anhui University Hefei 230039 China

A novel high molecular weight functional polyacetylene bearing oxadiazole group as a pendant, poly{4-[2-（4-octoxyphenyl）-1,3,4-oxadiazolyl]-benzenyloxypropynylene}, was synthesized by [Rh（nbd）Cl]2-Et3N catalyst. The polymer was soluble in common organic solvents such as CHCl3 and THE The structures and properties of monomer and polymer were characterized and evaluated with FTIR, NMR, UV, TGA, GPC, and CV, respectively. The results show that the polymer possesses high thermal stability and well electron-injection property.

关键词： CV Oxadiazole Polyacetylene Thermal stability

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A novel poly[acrylonitrile-co-(3-ammoniumcarboxylate-butenoic acid-methylester)]copolymer for carbon fiber precursor

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Chinese Chemical Letters 2012年第11期23卷 1307-1310页

作者： An Qi Ju Shan Yi Guang hong yao xu College of Materials Science and Engineering&State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua UniversityShanghai 201620China College of Chemistry&Chemical Engineering Donghua UniversityShanghai 201620China

A novel bifunctional comonomer 3-ammoniumcarboxylate-butenoic acid-methyl ester （ACBM） was synthesized tor preparing poly[acrylonitrile-co-（3-ammoniumcarboxylate-butenoic acid-methyl ester）] [P（AN-co-ACBM）] copolymer as a carbon fiber precursor. Differential scanning calorimetry results show that the P（AN-co-ACBM） exhibits a significantly improved stabilization performance compared with polyacrylonitrile （PAN）, such as lower cyclization temperature and smaller rate of heat release, which is mainly attributed to the initiation of ACBM through an ionic cyclization mechanism. Simultaneously, the rheological analysis shows that P（AN-co-ACBM） possesses better spinnabilitv than PAN.

关键词： Polyacrylonitrile Carbon fiber Thermal analysis DSC Polymerization

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Synthesis and characterization of poly(methyl methacrylate-co-polyhedral oligomeric silsesquioxane)hybrid nanocomposites

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Chinese Chemical Letters 2007年第8期18卷 960-962页

作者： Ben hong Yang hong yao xu Cun Li Shan Yi Guang School of Chemistry and Chemical Engineering Anhui University Hefei 230039 China College of Material Science and Engineering ＆ State Key Laboratory of Chemical Fibers and Polymeric Materials Donghua University Shanghai 200051 China Department of Chemical and Material Engineering Hefei University Hefei 230022 China

A novel poly（methyl methacrylate-co-polyhedral oligomeric silsesquioxane） hybrid nanocomposite was synthesized by free radical polymerization and characterized by 1H NMR, 29Si NMR, and TGA technologies. Compared wit... 详细信息

关键词： Poly(methyl methacrylate) Polyhedral silsesquioxane Nanoeomposite

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A versatile nanobuilding precursor for the effective architecture of well-defined organic/inorganic hybrid via click chemistry

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Chinese Chemical Letters 2012年第9期23卷 1095-1098页

作者： Ya Kun Zhu Shan Yi Guang hong yao xu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials&College of Material Science and Engineering Donghua UniversityChina Shanghai 201620 College of Chemistry Chemical Engineering and BiotechnologyDonghua UniversityChina Shanghai 201620

A novel octazido substituted nanobuilding precursor, octakis[dimethy（p-azidomethylene）siloxyl]octasilsesquioxane （ODA）, was prepared by the conventional diazo-transfer reaction of octalds[dimethy（p-chloromethylene）silyl]octasilsesquioxane （ODC） with NAN3, and its structure was characterized by FT-IR, 1H, a3C, 29Si NMR and MALDI-TOF MS, respectively. The structural rearrangement of POSS core in the synthesis strategy of ODA developed in this work was effectively prohibited in comparison with traditionary azidization process. The resultant ODA was not only soluble in common solvents such as CHC13, THF, toluene, DMF and DMSO, but also could effectively serve as a versatile nanobuilding precursor for the architecture of well-defined organic- inorganic hybrids via click chemistry.

关键词： Azides POSS Nanoparticles Structural Click chemistry

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Preparation and properties of a POSS-containing organic-inorganic hybrid crosslinked polymer

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Chinese Chemical Letters 2009年第6期20卷 738-742页

作者： Wang Yan Nie Gang Li Yang Li hong yao xu School of Chemistry and Chemical Engineering & the Key Laboratory of Environment-friendly Polymer Materials of Anhui Province Anhui University Hefei 230039 China College of Material Science and Engineering & State Key Laboratory of Chemical Fibers and Polymeric Materials Modification Donghua University Shanghai 201620 China

A novel POSS-containing organic-inorganic hybrid crosslinked polymer was prepared by hydrosilylation reaction of octahydridosilsesquioxane （TsHs） with 4,4＇-bis（4-altyloxybenzoyloxy）phenyl （diene A）. Its structure and property was characterized by FFIR, 29Si NMR, TGA and ellipsometer, respectively. The results show that the hybrid polymer possesses high thermal stability and low dielectric constant of 1.97 at optical frequencies.

关键词： POSS Hydrosilylation Organic-inorganic hybrid polymer Thermal stability Dielectric property

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Preparation and near-infrared optical limiting property of fluorene-containing functional polyacetylene

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Chinese Chemical Letters 2011年第10期22卷 1257-1260页

作者： Nai Bo Lin Yan Feng Shan Yi Guang hong yao xu College of Material Science and Engineering ＆ College of Chemistry and Chemical Engineering Donghua University Shanghai 201620 China College of Chemistry and Chemical Engineering Anhui University Hefei 230039 China

A novel functional polyacetylene containing fluorene group as a pendant,poly（2-（p-methylstyrene）-7-acetylene-9,9-dioctyl-fluorene）, was synthesized in moderate yield by[Rh（nbd）Cl]_2-Et_3N *** structures and properties of monomer and polymer were characterized and evaluated with FTIR,NMR,UV-vis,GPC and Z-scan,*** results show that the incorporation of fluorene into polyacetylene has endowed the resultant polymer with well optical limiting properties for laser at wavelength 780 nm based on two-photon absorption mechanism.

关键词： Substituted polyacetylene Fluorene Nonlinear optics Two-photon absorption

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Preparation and property of a novel soluble electron transport POSS-based hybrid material

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Chinese Chemical Letters 2008年第6期19卷 634-638页

作者： Xin Wang Juan Shen Jin Cui Wu Min Fang hong yao xu School of Chemistry and Chemical Engineering Anhui University Hefei 230039 China College of Material Science and Engineering ＆ State Key Laboratory of Chemical Fibers and Polymeric Materials Donghua University Shanghai 201620 China School of Chemistry Chizhou University Chizhou 247000 China

A novel POSS-based organic/inorganic hybrid covalently attached at molecular level, 2-（4-（allyloxy）phenyl）-5-（4-（octyloxy）phenyl）-1,3,4-oxadiazole-POSS （6）（abbreviated as oxadiazole-POSS） was synthesized by Pt（dcp） catalyst. The hybrid was soluble in common organic solvents such as CHCl3, toluene, C2H4Cl2, and THF. Its structures and properties were characterized and evaluated with FTIR, 1^H NMR, 13^C NMR,29^Si NMR, EA, TGA, DSC, GPC, and CV, respectively. The results show that the novel hybrid possesses high thermal stability and good electron injection ability.

关键词： CV Electron transport Oxadiazole POSS Thermal stability

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Preparation and Nonlinear Optical Property of Azobenzene Substituted Polyacetylene

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Chinese Chemical Letters 2005年第12期16卷 1603-1606页

作者： Shou Chun YIN Gang LI hong yao xu Ya Chen GAO Yin Lin SONG Faculty of Chemistry and Chemical Engineering Anhui University Hefei 230039 Department of Physics Harbin Institute of Technology Harbin 150001

Two new functional polyacetylenes bearing different azobenzene group, -{ HC=C[azo-N （CH3）CH2CH2OH] } n-, [poly（EHAB）; azo = 4,4＇-azobenzene] and - { HC=C[azo-N（CH3）CH2CH2O COC3H7]},-, [poly（EEAB）]} were prepared by [Rh（nbd）Cl]2-Et3N catalysts. Poly（EHAB） has poor solubility while poly（EEAB） can be dissolved in common solvent. The polymers were characterized by FHR, ^1H NMR, UV and GPC. The nonlinear optical property of the soluble poly（EEAB） was investigated with 8 ns width pulse at 532 nm by Z-scan technique. The results show that poly（EEAB） is endowed with the larger third-order nonlinear optical property.

关键词： Substituted polyacetylene nonlinear optics azobenzene

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Synthesis and optical limiting in copolymers of C_(60) and 1-phenyl-1-butyne

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Chinese Chemical Letters 2000年第1期11卷 21-22页

作者： hong yao xu Shan Yi GUANG Ben Zhong TANG (Department of Chemistry, Anhui University, Hefei 230039 Department of Chemistry, hong Kong University of Science & Technology, Clear Water Bay, Kowloon, hong Kong) Department of Chemistry Anhui University Hefei 230039 China Department of Chemistry Hong Kong Univ. of Sci. and Technol. Clear Water Bay Kowloon Hong Kong

While WC_16-Ph_4Sn is a poor catalyst for the polymerization of l-phenyl-butyne (PB) at room temperature, it effectively polymerizes PB in the presence of C_(60), giving high molecular weight polymers in high yields. The polymer is soluble in THF and chloroform and spectroscopic analysis reveals that Coo has copolymerized with PB. Thus, C_(60) plays dual roles of comonomer and cocatalyst in the acetylene polymerization. The copolymers strongly attenuate 532-nm laser pulses, whose limiting performance is superior to that of parent C_(60)

关键词： C_(60) polyacetylene fullerene polymer.

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