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Table of Content

    24 June 2006, Volume 22 Issue 3
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    Articles
    Solvothermal Synthesis and Crystal Structure of Zn(en)3 B5 O7 (OH)3
    HE Yi, CHEN Wei, YANG Jin, XI Chun-yu, CHEN Jie-sheng
    2006, 22(3):  271-273. 
    Abstract ( )   PDF (319KB) ( )  
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    A new polyborate containing chiral metal-complex Zn (en)3 B5 O7 (OH)3, where en = ethylenediamine, was synthesizedunder solvothermal conditions and structurally characterized by means of X-ray diffraction analysis. Crystal data: Zn (en)3 B5 O7 (OH)3, monoclinic, space group P21/c, a = 0. 8532 (72) nm, b = 2. 3340 (5) nm, c =0.9526(92) nm, β=107.04(3)°, Z=4, V=1.8140(6) nm3, Dc =1.694 g/cm3,μ=1.416 mm-1, F(000)960, GOF= 1.020, R = 0.0276, Rw = 0. 0828. There is a chira l Zn(en)32+ com plex cation and an iso lated B5O7· =(OH)32- group in a Zn(en)3B5O7 (OH)3 molecule. The enantiomer of the chiral complex cation is separated orderly as Δ and Λ configurations in the compound and the borate group consists of two B3O3 cycles linked through a bridging boron atom.
    Synthesis and Fluorescence Properties of Eu2+-Doped KMgF3 Nanoparticles
    YAN Jing-hui, ZHANG Ming, LIAN Hong-zhou, LIU Jie, LI Zhong-tian, CAO Jie, SHI Chun-shan
    2006, 22(3):  274-277. 
    Abstract ( )   PDF (749KB) ( )  
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    The phase diagram of a cetyltrimethyl ammonium bromide (CTAB)/n-butanol/n-octane/KNO3-Mg (NO3)2 system was drawn. Nanoparticles of Eu2+ -doped KMgF3 were prepared from the quaternary microemulsions of cetyltrimethyl ammonium bromide(CTAB), n-butanol, n-octane and water. The X-ray diffraction(XRD) patterns were indexed to a pure KMgF3 cubic phase. The environmental scanning electron microscopic(ESEM) images show the presence of spherical Eu2+ -doped KMgF3 nanoparticles with a diameter of ca. 20 nm. The emission of KMgF3: Eu2+ nanoparticles peaks at 360 nm. The excitation band was observed at 250 nm with a blue shift of ca. 70 nm compared with that of KMgF3: Eu2+ single crystal. The preparation method of nano-KMgF3: Eu2+/PMMA composite films was inquired into.
    Synthesis, Characterization and Cytotoxicity of Ammine/Methylamine Platinum(Ⅱ) Complexes with Carboxylates
    ZHANG Jin-chao, SHEN Yong, YANG Meng-su
    2006, 22(3):  278-282. 
    Abstract ( )   PDF (258KB) ( )  
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    Seven novel platinum (Ⅱ) complexes [Pt (Ⅱ) (NH3) (CH3NH2) X2] (Ⅰ-Ⅶ) (X: CH3COO- ,CH2 ClCOO- , CHCl2COO-, C6H5-COO- , p-CH3O-C6H4-COO- , p-NH2-C6 H4-COO- , p-NO2-C6H4-COO-) were prepared and characterized by means of elemental analysis, molar conductivity, thermal analysis,IR, UV, and 1 H NMR spectrometries. The cytotoxicity against HCT-8, BGC-823, MCF-7, EJ, and HL-60 cell lines increases in the following sequence: cisplatin ＞Ⅳ＞Ⅴ＞Ⅵ＞Ⅶ＞Ⅰ＞Ⅱ＞Ⅲ. Moreover, the complexes(Ⅰ-Ⅶ) display substantially greater activities against EJ and HL-60 cell lines than those against the cell lines from other carcinomas. They can induce a concentration-dependent accumulation of HL-60 cells in the G2/M phase of the cell cycle as cisplatin. There is no significant correlation between total DNA platination levels and cytotoxicity of the complexes.
    Synthesis and Properties of a Heteronuclear Ag(Ⅰ)/Ni(Ⅱ) Complex
    WANG Jiang-yun, GU Wen, WANG Wen-zhen, LIU Xin, LIAO Dai-zheng
    2006, 22(3):  283-286. 
    Abstract ( )   PDF (274KB) ( )  
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    A complex, Ni(en)2Ag3(CN)5 (en = ethylenediamine), was obtained through the reaction of [Ag(CN)2]-units with Ni Ⅱ -diamine cation [Ni(en)2]2+, and the structure was determined by single crystal X-ray diffraction. It is indicated that the complex has a 3D architecture through the silver-silver interactions and the bridging cyano groups. This complex displays interesting luminescent properties caused by argentophilicity at room temperature in solid state.
    Enzymatic Determination of Glucose by Optical-Fiber Sensor Sequential Injection Renewable Surface Spectrophotometry
    WANG Jian-ya, FANG Zhao-lun
    2006, 22(3):  287-291. 
    Abstract ( )   PDF (308KB) ( )  
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    On the basis of oxidative decoloration of bromopyrogallol red(BPR) with H2O2, catalyzed by horseradish peroxidase(HRP), and the sequential injection renewable surface technique(SI-RST), a highly sensitive optical-fiber sensor spectrophotometric method for the enzymatic determination of hydrogen peroxide was proposed. By coupling with a glucose oxidase(GOD)-catalyzed reaction, the method was used to determine glucose in human serum. The considerations in system and flow cell design, and factors that influence the determination performance are discussed. With 100 μL of sample loaded and 0. 6 mg of bead trapped, the linear response range from 5.0 × 10-8 to 5. 2 × 10-6mol/L BPR with a detection limit(3σ) of 2. 5 × 10-8 mol/L BPR, and a precision of 1.1% RSD(n = 11) and a throughput of a 80 samples per hour can be achieved. Under the conditions of a 8. 7 × 10-6 mol/L BPR substrate,0.04 unit/mL HRP, 600 s reaction time and a reaction temperature of 37 ℃, the linear response range for H2O2 was from 5.0 × 10-8 to 7.0 × 10-6 mol/L with a detection limit(3σ) of 1.0 × 10-8 mol/L and a precision of 3.7% RSD(n=11). The linear response range by coupling with a GOD-catalyzed reaction was from 1.0 ×10-7 to 1.0 × 10-5mol/L. The method was directly applied to determine glucose in human serum. Glucose contents obtained by the proposed procedure were compared with those obtained by using the phenol-4-AAP method, the error was found to be less than 3%.
    Spectroscopic Electrochemical Studies of Interaction Between Fuchsin Basic DNA
    YANG Tao, WANG Zeng-Jian, JIAO Kui, LI Qing-Jun
    2006, 22(3):  292-296. 
    Abstract ( )   PDF (271KB) ( )  
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    Visible spectroscopic and electrochemical methods were used to study the interactions between DNA and fuchsin basic(FB). FB has an irreversible electro-oxidation peak in 5 mmol/L Tris-HCl buffer solution at pH = 7.4 on a glassy carbon electrode(GCE). After adding certain concentration of dsDNA, the oxidation peak current of FB decreases, but the peak potential hardly changs. The visible absorption spectroscopic study shows that the binding mode of FB to dsDNA is intercalative binding and electrostatic binding when the ratio of the concentration of dsDNA to FB is smaller than 0. 2, and a new substance, which produces a new absorption peak, is obtained via a covalent binding between dsDNA and FB apart from intercalative binding and electrostatic binding when the ratio of the concentration of dsDNA to FB is larger than 0. 2. The visible absorption spectra varies no longer when the ratio of the concentration of dsDNA to FB is larger than 1.5. A mean binding ratio of dsDNA to FB was determined to be 1.4: 1,suggesting that two complexes FB-dsDNA and FB-2dsDNA be formed. The interaction between FB and ssDNA was only electrostatic binding. The more powerful interaction of FB with dsDNA than with ssDNA may be applied for the recognition of dsDNA and ssDNA, and in DNA biosensor as hybridization indicator.
    Evaluation of Improved Ultrasonic Nebulizer for Miniature Simultaneous Microwave Plasma Torch Spectrometer
    FENG Guo-dong, JIANG Jie, HUAN Yan-fu, ZHENG Jian, LI Ming, CAO Yan-bo, JIN Qin-han, YU Ai-min
    2006, 22(3):  297-301. 
    Abstract ( )   PDF (253KB) ( )  
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    A new automatic sample solution introduction system for miniature simultaneous microwave plasma torch(MPT)atomic emission spectrometer was developed. The operating parameters were optimized. The detection limits of the spectrometer with an ultrasonic nebulizer for Ag, Al, Ba, Ca, Cr, Cu, Fe, Mg, Mn, Sr, and V are 5-10 times lower than those obtained with a pneumatic nebulizer and are also lower than those obtained by a Model JX-1010 MPT spectrometer. Two practical samples were analyzed to test the reliability and sensitivity of the system.
    RO-heparin Inhibits L-Selectin-mediated Neutrophils Adhesion to Vascular Endothelium Under Flow Conditions
    CHEN Zhi-hong, XU Li, BA Xue-qing, ZENG Xian-lu
    2006, 22(3):  302-307. 
    Abstract ( )   PDF (3467KB) ( )  
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    Selectins are carbohydrate-binding cell adhesion molecules that play a major role in the initiation of inflammatory responses. Accumulaed evidence has suggested that heparin's anti-inflammatory effects are mainly mediated by blocking L- or P-selectin-initiated cell adhesion. Recently, we have reported that periodate-oxidized, borohydridereduced heparin (RO-heparin) can inhibit P-selectin-mediated acute inflammation. Here we further examined the effect of RO-heparin on the adhesion of L-selectin-mediated leukocytes to vascular endothelium under flow conditions in vivo and in vitro. The results show that RO-heparin with a low anticoagulant activity can effectively reduce leucocyte rolling on thioglycollate-induced rat mesenteric venules and L-selectin-metadiated neutrophil rolling on TNF-α-induced human umbilical vein endothelial cells(HUVECs) under flow conditions. Our findings suggest that the effect of RO-heparin on inflammatory responses is mainly a result of its inhibiting the interaction between P- or L-selectin and its ligands. The findings also suggest that RO-heparin may be useful in preventing inflammation diseases.
    Preparation of Polyclonal Antibodies Against Testis-specific Protease 50 and Characterization of Antibody Specificity
    ZHANG Jing, YANG Ming, XU Ze-Li, BAO Yong-li, WU Yin, WANG Yue-zeng, MENG Xiang-ying, JU Xing-da, GU Yang, LI Yu-xin
    2006, 22(3):  308-311. 
    Abstract ( )   PDF (422KB) ( )  
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    Testis-specific protease 50 (TSP50) is a testis-specific oncogene, which is abnormally activated in most tested patients with breast cancer. This property makes it an attractive molecular marker and a promising target for the diagnosis and therapy of breast cancer. In order to obtain the protective and specific polyclonal antibodies for further research, TSP50 cDNA was amplified by RT-PCR from normal human testicular tissue, and inserted into eukaryotic expression vector pcDNA3.1. Rabbit anti-TSP50 polyclonal antibodies were prepared by means of intramuscular injection of pcDNA3.1-TSP50 into the rabbits. Titers of the anti-sera were measured by ELISA and Western blotting with the E. coli cell lysate containing the induced GST-TSP50 fusion protein as an antigen. In addition, we examined the expression of TSP50 in both breast cancer cell line MCF-7 and breast cancer tissue by immunofluorescent and immunohistochemistry analysis.
    Activation Effect of Cathartic Natural Compound Rhein to CFTR Chloride Channel
    SHI Lin-lin, XU Li-na, HOU Shu-guang, LIN Sen, YANG Hong, MA Tong-hui
    2006, 22(3):  312-314. 
    Abstract ( )   PDF (208KB) ( )  
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    The cystic fibrosis transmembrane conductance regulator (CFTR) is a cAMP-activated chloride channel expressed in intestinal exocrine glands, which plays a key role in intestinal fluid secretion. A natural anthraquinone activator of CFTR Cl- channel, rhein, was identified by screening 217 single compounds from Chinese herbs via a cellbased halide-sensitive fluorescent assay. Rhein activates CFTR Cl- transportation in a dose-dependent manner in the presence of cAMP with a physiological concentration. This study provides a novel molecular pharmacological mechanism for the laxative drugs in Traditional Chinese Medicine such as aloe, cascara and senna.
    Analysis of Organic Acids Accumulated in Kochia Scoparia Shoots and Roots by Reverse-phase High Performance Liquid Chromatography Under Salt and Alkali Stress
    YAN Hong, ZHAO Wei, JIAO Xin-qian, YAN Bing-jun, ZHOU Dao-wei
    2006, 22(3):  315-318. 
    Abstract ( )   PDF (587KB) ( )  
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    Several organic acids accumulated in Kochia Scoparia shoots and roots were studied by means of reverse-phase high performance liquid chromatography with a C18 column. Five types of binary organic acids were separated. The organic acid concentrations were determined in K. Scoparia seedlings stressed by saline (NaCl) and alkaline(NaHCO3) at the same Na+ concentration. Concentrations of organic acids are stimulated by alkaline because the cells will adjust their pH values through the accumulation of organic acids, when the environment is basic. The concentrations of oxalic acid and succinic acid are higher than those of other organic acids, including tartaric acid and malic acid, and the concentration of citric acid is the lowest. The concentrations of the organic acids in the roots are higher than those in the shoots under salt(NaCl) stress, but the results are opposite while the roots are under alkali (NaHCO3) stress. This indicates that there are different adaptive strategies for K. Scoparia seedlings in organic acid metabolism under salt and alkali stress.
    Differential Proteomic Analysis of Neonatal Cardiomyocytes in Response to β-Adrenergic Receptor Stimulation
    LI Zi-jian, LIU Ning, LIU Zhi-qiang, LIU Shu-ying, HAN Qi-de, ZHANG You-yi
    2006, 22(3):  319-323. 
    Abstract ( )   PDF (1121KB) ( )  
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    β-Adrenoceptors(β-ARs) play a critical role in regulating cardiac functions under both physiological and pathological conditions. To further explore the mechanisms through whichβ-ARs perform its actions, proteomic approaches were adopted to study the global protein patterns in cultured neonatal rat cardiomyocytes exposed to isoproterenol(ISO). A modified method, "Mirror Images in One Gel", was used to improve the reproducibility and resolution power of two-dimensional electrophoresis. A 2-DE map with a good reproducibility was obtained in which 1281 ± 70spots were detected and about 1191 e 54 spots were matched, with an average matching rate of 92. 9%. Nine proteins with significant changes were identified by using peptide mass fingerprinting(PMF) data obtained via MALDI-MS.
    Studies on Interactions of Antibiotics with Serum Albumin by Surface Plasmon Resonance Biosensor
    SUN Ying, LIU Shi-chun, LIU Xia, SONG Da-qian, BI Shu-yun, ZHANG Han-qi
    2006, 22(3):  324-327. 
    Abstract ( )   PDF (219KB) ( )  
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    Characterizing how chemical compounds binding to serum albumin is essential in evaluating drug candidates and is the focus of this study. A surface plasmon resonance biosensor developed in this laboratory was used to determine the binding constants of antibiotics with serum albumin. The binding constants of five antibiotics(azithromycin, spectinomycin, gentamycin, metacycline and kanamycin) with serum albumins were obtained.
    Components Essential Oils in Different Parts of Daucus carota L. var. sativa Hoffm
    WU Yin, XU Ze-Li, LI Hong-jun, MENG Xiang-ying, BAO Yong-li, LI Yu-xin
    2006, 22(3):  328-334. 
    Abstract ( )   PDF (351KB) ( )  
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    The components of the essential oils obtained from different parts of Daucus carota L. var. sativa Hoffm were analyzed. The percentages of the essential oils extracted are 0. 27% (mL/100 g material) for the flowers, 0. 07% for the stems and leaves and 0. 01% for the roots. Fifty-four, Sixty-six and Thirty-three compounds were, respectively,separated and identified from the flowers, the stems and leaves and the roots, among which unsaturated alkene compounds are thirty-nine, thirty-nine and twenty-one, respectively, accounting in turn for up to 90. 21%, 90. 49% and 72. 65% of the total essential oils. Because alkene compounds have double bonds that are easily oxidized, it can be inferred that the components of the essential oils in the different parts of Daucus carota L. var. sativa Hoffm should show an activity of the anti-formation of free radicals to some extent.
    Determination of Magnolol and Honokiol by Non-aqueous Capillary Electrophoresis
    TIAN Yi-ling, CHEN Guan-hua
    2006, 22(3):  335-338. 
    Abstract ( )   PDF (224KB) ( )  
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    Two active principles in traditional Chinese medicine Magnolia officinalis, magnolol and honokiol, were successfully separated by means of nonaqueous capillary electrophoresis. The effect of the composition of a nonaqueous buffer on column efficiency and resolution, and the effect of acid additives on peak shapes were researched. The separation was conducted with a running buffer in a mixture of methanol/acetonitrile/formamide (volume ratio: 1: 2: 2), in which the concentrations of Tris, acetic acid, and water were 60 mmol/L, 0. 04 mmol/L and 5% (volume fration),respectively, and the pH* (apperent pH) of the running buffer was 8. 96. Magnolol and honokiol were separated on baseline within 20 min. The relative standard deviation of the analytes' concentrations in the sample is 1.32% for magnolol and 1.60% for honokiol, and the recoveries of the spiked sample are 98.4% for magnolol and 98.0% for honokiol, respectively.
    Highly Selective Preparation of 3-and 6-Modified Mannose/Altrose Derivatives
    LIU Xiao-hong, XIE Dang, CHENG Chang-mei, WANG Xia-yu, GUO Xiao-qiang, ZHAO Yu-fen
    2006, 22(3):  339-342. 
    Abstract ( )   PDF (213KB) ( )  
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    A highly efficient method to get 3-and 6-modified mannose/altrose derivatives for oligosaccharide synthesis is described. All the compounds were obtained exclusively with the combinations of 3-and/or 6-hydroxyl protection and/or activation(including the configuration conversion of 3-carbon atom).
    Analysis of Norditerpenoid Alkaloids Extracted from Aconitum sinomantanum Nakai by Electrospray Ionization Tandem Mass Spectrometry
    XU Qing-xuan, YUE Hao, LIU Zhi-qiang, WANG Yong, YAN Cun-yu, LIU Shu-ying
    2006, 22(3):  343-346. 
    Abstract ( )   PDF (631KB) ( )  
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    Electrospray ionization mass spectrometry(ESI-MS) was applied simultaneously in determining norditerpenoid alkaloids from the roots of Aconitum sinomantanum Nakai (RAS) based on molecular mass information. The tandem mass spectra(ESI-MSn) provided the alkaloidal structural information, through which the existence of these alkaloids was further confirmed. Accordingly, six known norditerpenoid alkaloids were simultaneously determined on the basis of their ESI-MSn spectra. Furthermore, based on the diagnostic fragmentation pathways of alkaloidal MSn, a rapid method for direct detection and characterization of alkaloids from an ethanolic extract of RAS was described.
    Comparative Studies on Mass Spectrometric Fragmentation of Linear Chiral Secondary Alcohols (R)-1-(4-Alkylphenyl) and (R)-1-(4-Alkoxyphenyl/Alkylthiophenyl) Alcohols
    ZHANG Qi-han, SU Xian-bin, XU Jia-xi
    2006, 22(3):  347-350. 
    Abstract ( )   PDF (201KB) ( )  
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    Mass spectrometric behaviour of (R)-1-(4-alkylphenyl) alcohols, 1-(4-alkoxylphenyl) alcohols, and 1-(4-alkylthiophenyl) alcohols were studied with the aid of mass-analyzed ion kinetic energy spectrometry under electron impact ionization. All the title compounds show a tendency to eliminate a water molecule to form alkene ions and undergo an a-cleavage to produce protonated aldehyde ions by the loss of alkyl radicals. Except these two common fragment ions, they also show some different fragmentations due to with or without oxy/thioether-linkage.
    A New Synthesis Method and GABA Transporters Inhibitory Activities of Tiagabine and Its Analogues
    ZHANG Jian-ge, JIANG Chang-sheng, ZHENG Jian-bin, WEN Ren, LIN Guo-qiang
    2006, 22(3):  351-355. 
    Abstract ( )   PDF (732KB) ( )  
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    A new synthetic method and GABA transporter inhibitory activities of Tiagabine and its analogues are described.The key intermediates 4-tosyl-1,1-diaryl/heteroaryl-1-butene 10a-10e were synthesized by Wittig reaction, and followed by N-alkylation with (R)-3-piperidinecarboxylate. The resulting N-diheterocyclylalkenylpiperidine-3-carboxylic acid ester 11a-11e were saponified and then acidified toget the target compounds 1a-1e. The preliminary bioassays show that compound 1a-1e exhibited excellent inhibition of [3H]-GABA uptake in vitro of culture cells.
    Design, Synthesis, and Activities of Novel Derivatives of Isophthalamide and Benzene-1,3-disulfonamide
    LIU Xiu-jie, WANG Song-qing, ZHANG Jing, ZHANG Feng-xia, LI Gui-zhu, WANG Bao-jie, SHAO Ying-lu, ZHANG Li-guang, FANG Lin, CHENG Mao-sheng
    2006, 22(3):  356-359. 
    Abstract ( )   PDF (207KB) ( )  
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    Based on the antiplatelet aggregation mechanism and the bioisosterism principle of the reference drug picotamide, thirteen novel derivatives of arylamide and arylsulfonamide were designed and prepared. The biological activities of these derivatives were investigated. The chemical structures of the target compounds were confirmed by 1H NMR and IR. The in vitro activities of antiplatelet aggregation of the thirteen target compounds were assessed by Born's method. Compounds 2b and 8h have significant antiplatelet aggregation activities, which are superior to the corresponding activity of Picotamide.
    Indirect Electrochemical Oxidation of 4-Amino-dimethyl-aniline Hydrochloride
    ZHANG Qiang, KANG Bo, XU Hong, LIN Hai-bo
    2006, 22(3):  360-363. 
    Abstract ( )   PDF (213KB) ( )  
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    The indirect electrochemical oxidation of 4-amino-dimethyl-aniline hydrochloride containing wastewater generated from vanillin production is presented. Experiments were conducted at a constant current density of 30 mA/cm2 via a Ti/Ru-Ti-Sn ternary oxide coated anode and an undivided reactor. During the various stages of the electrolysis, parameters such as the values of chemical oxygen demand (COD) and total organic carbon (TOC) were determined in order to evaluate the feasibility of the electrochemical treatment. The energy consumption and the current efficiency during the electrolysis were calculated. The present study proves the effectiveness of the electrochemical treatment for wastewater resulted from vanillin production.
    Hydrothermal Synthesis, Characterization and Catalytic Properties of Nanoporous MoO3/ZrO2 Mixed Oxide
    SHI Wei, LIU Hai-yan, REN Dong-mei, MA Zhuo, SUN Wen-dong
    2006, 22(3):  364-367. 
    Abstract ( )   PDF (232KB) ( )  
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    A nanoporous MoO3/ZrO2 mixed oxide was hydrothermally synthesized by hydrolyzing zirconium isopropoxide in the presence of a cationic surfactant, cetyltrimethylammonium bromide(CTAB). The crystal structure and the acidity of the obtained nanoporous MoO3/ZrO2 mixed oxide were determined by means of XRD, N2 adsorption-desorption and NH3-TPD, respectively. The isobutane/butene alkylation over the MoO3/ZrO2 catalyst was carried out in a fixed bed reactor. The results reveal that ZrO2 in MoO3/ZrO2 exists mainly in the tetragonal phase, and the catalyst samples possess large specific surface areas as well as moderate acidity for isobutane/butene alkylation. Compared with samples prepared by impregnation and sol-gel processes, MoO3/ZrO2 mixed oxide samples prepared in this work have a better catalytic activity.
    Oligo-lysine Induced Formation of Silica Particles in Neutral Silicate Solution
    ZHANG Xiao-dong, SUN Ying-ying, ZHUANG Jia-qi, YANG Wen-sheng
    2006, 22(3):  368-370. 
    Abstract ( )   PDF (472KB) ( )  
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    Oligo-(lysine)n (n = 1-4) containing different numbers of lysine residues was used to induce the condensation of silicic acid to form silica particles in neutral silicate solution. It was found that the condensation rate and the formation of silica particles are dependent on the number of lysine residues in an oligo-lysine. Oligo-lysine with more lysine residues can link more silicic acid together to form a matrix that promotes the effective aggregation of the condensed silica pieces to form large silica particles.
    Catalytic Synthesis of Isopropyl Benzene over SO42-/ZrO2-MCM-41
    WEI Chang-ping, LI Shu-zeng, ZHOU Bin, PENG Chun-jia, ZHEN Kai-ji
    2006, 22(3):  371-374. 
    Abstract ( )   PDF (218KB) ( )  
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    Super acid catalyst SO42-/ZrO2 was introduced into pure silicone MCM-41 via the impregnation method and the catalyst samples obtained at different temperatures were characterized by means of XRD, IR, and Py-IR techniques.The selectively catalytic gas-phase flow reactions of benzene with propene over the catalyst samples were carried out in a made-to-measure high-pressure flow reactor equipped with a thermostat and a condenser. Effect of the preparative condition on the catalytic synthesis of isopropyl benzene over the catalyst samples was tested. The results show that SO42-/ZrO2-MCM-41 (SZM-41) can be used as a catalyst for the title reaction, in which there are a higher conversion (97%) for the propene and a higher selectivity(93%) for the isopropyl benzene.
    UV Photoionization Study of the Ethyl Radical
    WANG Jing, WEI Li-xia, YANG Bin, YANG Rui, HUANG Chao-qun, SHAN Xiao-bin, SHENG Liu-si, ZHANG Yun-wu, QI Fei, YAO Chun-de, LI Qi, JI Qing
    2006, 22(3):  375-378. 
    Abstract ( )   PDF (234KB) ( )  
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    The ethyl radical was observed in a low-preasure premixed gasoline/oxygen/argon flame by using tunable vacuum ultraviolet photoionization mass spectrometry. The ionization energy(IE) of the ethyl radical was derived to be(8. 24± 0. 02) eV from the photoionization efficiency curve. In addition, a high-level ab initio Gaussian-3 (G3) method was used to calculate the energies of the radical and its cation. The calculated adiabatic ionization potential is 8. 17eV, which is in good agreement with the experimental value.
    Synthesis and Characterization of Microcapsules with Chlorpyrifos Cores and Polyurea Walls
    ZHANG Qiang, ZHANG Pei-pei, JIAO Qing-ze
    2006, 22(3):  379-382. 
    Abstract ( )   PDF (333KB) ( )  
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    Microcapsules with chlorpyrifos cores and polyurea walls were synthesized with 2,4-tolylene diisocyanate as an oil-soluble monomer and ethylenediamine as a water-soluble monomer via an interfacial polycondensation reaction.The products were characterized by means of Fourier transform infrared spectrometry, 13C NMR spectrometry and 31P NMR spectrometry.The morphology, the particle size and the particle size distribution, and the thermal properties were also evaluated.The prepared microcapsules exhibit clear and smooth surfaces and have a mean diameter of 28.13 μm.These microcapsules also have a good thermal stability for long-term use, and have potential applications in minimizing the toxicity of chlorpyrifos through controlled release.
    Preparation of Exfoliated Low-density Polyethylene/Montmorillonite Nanocomposites Through Melt Extrusion
    YANG Hong-mei, SONG Yi-hu, XU Bo, ZHENG Qiang
    2006, 22(3):  383-387. 
    Abstract ( )   PDF (412KB) ( )  
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    The effects of ethylene vinyl acetate copolymer (EVA) as a compatibilizer on the dispersion of organically modified montmorillonite(org-MMT) into low-density polyethylene(LDPE) during melt extrusion compounding were studied. The X-ray diffraction patterns reveal that as compared with LDPE, EVA can intercalate more easily into the interlay gallery of org-MMT when the composites contain a low org-MMT content. Exfoliated LDPE/org-MMT nanocomposites in the presence of an EVA compatibilizer could be prepared by using a two-step melt compounding technique with a twin-screw extruder.
    Letters
    Surface Enhanced Raman Spectroscopy of 4-Mercaptopyridine Molecules on Pb3O4 Nanoparticles
    WANG Yun-xin, WANG Yan-fei, GAO Ye, SUN Zhi-hua, ZHAO Chun, HU Hai-long, XU Wei-qing, WANG Zi-chen, ZHAO Bing
    2006, 22(3):  388-389. 
    Abstract ( )   PDF (138KB) ( )  
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    Molecular Imprinting Fibrous Membranes of Poly(acrylonitrile-co-acrylic acid) Prepared by Electrospinning
    CHE Ai-fu, YANG Yun-feng, WAN Ling-shu, WU Jian, XU Zhi-kang
    2006, 22(3):  390-393. 
    Abstract ( )   PDF (566KB) ( )  
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    Research Notes
    Analysis of Single Nucleotide Polymorphism in Human Paraoxonase 1 Gene(Q192R) with Matrix-assisted Laser Desorption/Ionization Time-of-flight Mass Spectrometry
    SUN Ya-dong, SUN Shu-chen, WANG Zhi, YANG Yang, ZHANG Jin
    2006, 22(3):  394-396. 
    Abstract ( )   PDF (204KB) ( )  
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    Electron Transfer Reaction Between Desoxyadenosine and Triplet 2-Methyl-1,4-naphthaquinone: A Laser Photolysis Study
    MA Jian-hua, LIN Wei-zhen, HAN Zhen-hui, YAO Si-de, LIN Nian-yun
    2006, 22(3):  397-399. 
    Abstract ( )   PDF (163KB) ( )  
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    New Xanthones from Polygala crotalarioides
    DENG Shi-ming, YANG Xian-hui, ZHAO You-xing, ZHOU Jun
    2006, 22(3):  400-402. 
    Abstract ( )   PDF (170KB) ( )  
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    Thermodynamics of Ion Pair of Magnesium Sulfate in Mixed Solvent
    YANG Jia-zhen, CHANG Xiao-hong, LU Xing-mei
    2006, 22(3):  403-405. 
    Abstract ( )   PDF (177KB) ( )  
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    Voltammetric Determination of Heparin Based on Its Interaction with Brilliant Cresyl Blue
    SUN Wei, DING Ya-Qin, JIAO Kui
    2006, 22(3):  406-409. 
    Abstract ( )   PDF (306KB) ( )  
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