Table of Content

10 October 2006, Volume 27 Issue 10

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研究论文

Hydrothermal Synthesis of Polycrystal Co₃O₄ with One Dimensional Nanostructures

ZHANG Wei-Min, ZHANG Yu, DONG Guang-Ming, SUN Zhong-Xi

2006, 27(10):  1791-1794.  doi:

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The powders of one dimensional nanostructures of Co₃O₄ were synthesized hydrothermally followed by decomposition of the precursors in the Co(NO₃)₂-CO^2-₃ system. The aspect ratio of products could be controlled by tailoring the concentration of Co(NO₃)₂ aqueous solution. That urine and hexamethylenetetramine taking the place of sodium carbonate as the precipitants could also produce 1D Co₃O₄ showed lights on understanding the mechanism of formation of 1D structures. The existence of CO^2-₃ intercalated between the brucite layers played an important role in the formation of 1D structures.

A Facile Approach for the Fabrication of Monodisperse Hollow Silica Spheres

DENG Zi-Wei, CHEN Min, ZHOU Shu-Xue, YOU Bo, WU Li-Min

2006, 27(10):  1795-1799.  doi:

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This paper presents a facile method for fabrication of monodisperse hollow silica spheres. In the approach, the monodispersed PS microspheres with different sizes prepared by dispersion polymerization or emulsifier-free emulsion polymerization were used as the template microspheres respectively, the silica shells were then coated on the PS microspheres by sol-gel method. During the coating of silica shell, the PS cores were dissolved subsequently even synchronously in the same medium to directly form monodispersed hollow spheres. TEM, SEM and porosity measurements were used to characterize the monodisperse hollow silica spheres. Based on the experimental results and discussion, a possible formation mechanism of the hollow silica spheres was proposed.

Synthesis and Antitumor Activity of Lanthanum(Ⅲ) Complexes to N-Alkyl-1,10-phenanthroline-2-methanamine

LI Feng-Hua^1,2, WU Hong-Xing², LIN Hua-Kuan²

2006, 27(10):  1800-1804.  doi:

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Five lathanum(Ⅲ) complexes containing 1,10-phenanthroline units were synthesized and characterized by elemental analyses, ¹H HMR and IR spectra. All complexes were assayed for antitumor activity in vitro against HL-60(human leukocytoma) cells, PC-3MIE8(human prostate carcinoma) cells, BGC-823(human stomach carcinoma) cells, MDA-MB-435(human galactophore carcinoma) cells, Bel-7402(human liver carcinoma) cells and Hela(human cervix carcinoma) cells. The results show that the complexes exhibit good growth inhibition against different cell lines in general. DNA binding studies indicate that the complexes possibly interact with ctDNA by part intercalative, covalent binding and electrostatic effection.

Formation and Luminescent Properties of New Heterobimetallic Complexes

ZHANG Qian-Ling¹, LIU Jian-Hong¹, REN Xiang-Zhong¹, ZHANG Pei-Xin¹, WANG Fang¹, LI Cui-Hua¹, LIU Jian-Zhong², JI Liang-Nian²

2006, 27(10):  1805-1810.  doi:

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The formation of new heterobimetallic complexes obtained via the coordination reactions of [Ru(bpy)₂TPPHZ]²⁺(TPPHZ=tetrapyrido[3,2-a: 2',3'-c: 3",2"-h: 2'",3'"-j]phenazine) and [Ru(bpy)₂ODHIP]²⁺(ODHIP=3,4-dihydroxyl-imidazo[4,5-f][1,10]phenanthroline) with Ni²⁺ were investigated by spectroscopic methods. The DNA-binding and luminescent properties of the complexes after coordinating with Ni²⁺ were also studied. The experimental results indicate that both [Ru(bpy)₂TPPHZ]²⁺ and [Ru(bpy)₂ODHIP]²⁺ could coordinate with Ni²⁺ to form the heterobimetallic
complexes [Ru(bpy)_2^•(TPPHZ)Ni]⁴⁺ and [Ru(bpy)₂(ODHIP)Ni]⁴⁺. The emission intensity of the complexes decreased with increasing the amounts of Ni²⁺. After binding to DNA, both complexes could coordinate with Ni²⁺ to form the heterobimetallic complexes. [Ru(bpy)₂(TPPHZ)Ni]⁴⁺ kept binding to DNA by intercalation, and the luminescence of complex almost disappeared at n(Ni)/n(Ru)=1. While the binding mode of [Ru(bpy)₂•(ODHIP)Ni]⁴⁺ changed from groove binding to intercalation, and the emission intensity of the complex decreased.

Growth of ZnO(Wurtzite) Whiskers Using the Floating Zone Method at High Oxygen Pressure

GUO Xing-Yuan¹, YU Ying-Ning², XU Da-Peng¹, DING Zhan-Hui¹, SU Wen-Hui^1,3,4

2006, 27(10):  1811-1814.  doi:

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ZnO(wurtzite) whiskers were grown by the floating zone method by using ZnO powder as the starting materials at various oxygen pressures. The as-grown samples were characterized by X-ray diffraction and Raman scattering, and their characteristic peaks show that the as-grown ZnO whiskers have an excellent hexagonal wurtzite phase and (001) orientation. The photoluminescence properties of the as-grown ZnO whiskers were measured by using Nd∶YAG laser(266 nm), and the influence of oxygen pressure on the crystal structure and defects was investigated. It is found that the presence of excessive oxygen reduced the defects in the as-grown ZnO whiskers, and the optimum oxygen pressure may be 0.3 MPa, which is favorable to the growth of ZnO whiskers.

Hydrothermal Synthesis and Spectroscopic Studies of Li_1.06Mn_0.8Cr_0.14O₂

ZHAO Li-Zhu^1,2, CHEN Gang¹, ZHANG Li-Juan¹

2006, 27(10):  1815-1818.  doi:

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The Cr-doped lithium manganese oxide was prepared by the hydrothermal technique. Structural characterization based on X-ray diffraction and Raman spectroscopy reveals that Li_1.06Mn_0.8Cr_0.14O₂ possesses a hexagonal crystal structure which is much favorable for improving electrochemical properties of the material. X-ray photoelectron spectroscopy(XPS) shows that the average oxidation state of Mn of the layered Li_1.06Mn_0.8Cr_0.14O₂ is more than Mn³⁺. This result should restrain Jahn-Teller effect and trend a stable structure for the material.

Studies on Thermal Conductive Properties and Mechanism of a New ACNT/C Nanocomposite Material

LI Zhi¹, GONG Qian-Ming¹, WANG Ye¹, LIANG Ji¹, HUANG Qi-Zhong², HUANG Bai-Yun²

2006, 27(10):  1819-1822.  doi:

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Aligned carbon nanotubes reinforced carbon matrix(ACNT/C) nanocomposites were fabricated by chemical vapor infiltration(CVI) technology. With carbon fiber reinforced carbon(C/C) composites in the same process as contrast, thermal conductivities of the composites were tested by laser flash method. The results show that the thermal diffusivity and conductivity of ACNT/C(about 1.47 g/cm³) is all 4—6 times than that of C/C composites(about 1.50 g/cm³). After heat treatment at 2 500 ℃, the thermal conductivity of ACNT/C can reach 140 W/(m·K), and the thermal conductivity of C/C composites is only about 40 W/(m·K). It was ascribed to that pyrocabon growing surround CNT shows a good crystallization and graphitizability, on the other hand, the quasi-one-dimensional long tubular graphitic structure can reduce phonon-phonon Umklapp scattering, and increase thermal conduction in ACNT/C nanocomposites at the same time.

Modification of Mesoporous Material and Stability of Immobilization of Penicillin G Acylase

GAO Bo^1,2, ZHU Guang-Shan¹, FU Xue-Qi², TENG Li-Rong², CHEN Jing¹, WANG Chun-Yan¹, QIU Shi-Lun¹

2006, 27(10):  1823-1826.  doi:

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Mesoporous materials of large pore size(12 nm)were synthesized by the usage of swelling agent. After modification, the mesoporous materials were used as the carriers in the immobilization of penicillin G acylase. Specifically, a study was carried out on the stability of the immobilized enzyme. Penicillin G acylase can catalyze the cleavage of the amide bond in the benzyl penicillin(penicillin G) side-chain to yield phenylacetic acid and 6-aminopenicillanic acid(6-APA). The enzyme is of great pharmaceutical importance, as the product 6-APA is the starting point for the synthesis of many semi-synthetic penicillin antibiotics. The activity of nature PGA is low, which limits the application of PGA. By immobilizing PGA on a solid support, it can be reused and its useful lifetime can be extended because the immobilized PGA is less susceptible to degradation, aggregation, or denaturation.The research results indicate that the functionalization of the internal surfaces of mesoporous solids permitted the enzyme immobilization. The reuse of the catalysts is also possible. The retention activity up to 90% of the PGA is observed in the most favorable case after using for 10 times.

研究快报

Luminescent Properties of Ce³⁺-Doped Sr₂MgSiO₅ Blue-emitting Phosphor

YANG Zhi-Ping, LIU Yu-Feng, XIONG Zhi-Jun

2006, 27(10):  1827-1829.  doi:

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The intense blue emitting phosphors Sr₂MgSiO₅∶Ce³⁺ were synthesized by high temperature solid state reaction method, and their luminescence properties were studied. The intense blue-emission band present a peak fixed at 420 nm, which consists of two peaks located at 408 and 445 nm, respectively. The two peaks are originated from the transition 5d→²F_5/2(4f) and 5d→²F_7/2(4f) of Ce³⁺ ions. The energy level difference value of the two emission bands is 2 038 cm^-1, which is consistent with the theoretic value(2 000 cm^-1) between the ground state: ²F_5/2 and ²F_7/2 of Ce³⁺ ions. The excitation spectra extend from 250 to 400 nm and the peak positions around 365 nm. In addition, the effect of the concentration of Ce³⁺ ions and the role of charge compensation of different ions to the emission intense were investigated, the experiment results suggest that when the proportion of Ce³⁺ ions to Sr₂MgSiO₅ were 0.03(molar ratio), the strongest emission was obtained. Li⁺, Na⁺, K⁺ and Cl^- ions can all enhance the intensity of the emissions; especially Cl^- ions gave the best improvement.

研究论文

Combination of Liquid Isoelectric Focusing and 2-DE Applied to the Analysis of Alkaline Proteins

ZHONG Hua, ZHANG Yang, FAN Hui-Zhi, YANG Peng-Yuan


2006, 27(10):  1830-1834.  doi:

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Alkaline proteins which represent a large part of proteome, remain a great challenge for conventional 2-DE. Fractionation methods can offset the weakness of 2-DE for the analysis of these proteins. In this work, liquid isoelectric focusing(LIEF) and two-dimensional electrophoresis(2-DE) were conbined for the analysis of alkaline proteins from rat liver. Under this strategy, the resolution of alkaline proteins on 2-D gel and reliability of proteins identification by MS were greatly improved, and more low-abundance and highly alkaline proteins were successfully identified compared to 2-DE without LIEF.

Preparation and Properties of Cy3 Doped Core-shell Silica Fluorescent Nanoparticals

HE Xiao-Xiao^1,2,3,4, CHEN Ji-Yun^1,2,4, WANG Ke-Min^1,2,4, TAN Wei-Hong^1,2,4, QIN Di-Lan^1,2,4

2006, 27(10):  1835-1839.  doi:

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Cy3 dye doped core-shell silica fluorescent nanoparticles was synthesized by using of water-in-oil microemulsion technique, with biomolecules modified Cy3 as the core and the silica produced from the hydrolysis TEOS(tetraethyl orthosilicate) as the shell. In this paper, five kinds of bimolecules with different pI values for preparation of Cy3 doped core-shell silica fluorescent nanoparticles were investigated. The results show that very bright and photostable Cy3 doped core-shell silica fluorescent nanoparticles can be both prepared by using Cy3-IgG or Cy3-polysine modified as the core material. And then Cy3-IgG was selected as a demonstration to prepare Cy3 doped core-shell silica fluorescent nanoparticles. A novel fluorescence marker was based by using the Cy3 doped core-shell silica fluorescent nanoparticles. The flu virus DNA was detected by using the Cy3 doped core-shell silica fluorescent nanoparticles, and the detection limit of the target DNA is 3.51×10^-10 mol/L.

Capillary Electrophoresis as a Tool for Screening Aptamer with High Affinity and High Specificity to Ricin

TANG Ji-Jun¹, XIE Jian-Wei¹, SHAO Ning-Sheng², GUO Lei¹, YAN Yan¹

2006, 27(10):  1840-1843.  doi:

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SELEX(Systematic Evolution of Ligands by Exponential Enrichment) process allows a rapid isolation of oligonucleotide sequences, known as aptamers binding target molecules with high affinity and specificity, which are equal or superior to those of antibodies, from a very large nucleic acid library. In this paper, capillary electrophoresis(CE) as a separation approach was introduced to SELEX procedure. The great high efficiency of CE gives rise to greatly shorten the selection procedure. The results from enzyme-linked assay and dot blot experiment show that an enrichment pool was obtained after four rounds selection, which can specifically be used to recognize ricin.

Element Transference Characteristics and Element Speciation Analysis in Panax quinquefolium. L by RP-HPLC-ICP-MS


CHEN Jun-Hui^1,2, XIE Ming-Yong¹, WANG Feng-Mei³, WANG Xiao-Ru^3,4, Frank S. C. LEE⁴

2006, 27(10):  1844-1848.  doi:

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Inductively coupled plasma mass spectrometry (ICP-MS) and high performance liquid chromatography coupled with ICP-MS (HPLC-ICP-MS) were applied to the study of the chemical speciation of inorganic elements in Panax quinquefolium. L. Chloroform, water and ethyl alcohol were employed to extract Panax quinquefolium. L, and the extracts were then determined by ICP-MS in order to analyze the transference characteristics of the elements. The RP-HPLC-ICP-MS technique was applied for the analysis of element speciation. The results showed that the polarity of the extraction solvent affects significantly the elemental transference ratio. The transference characteristics of kinds of elements including Mg, Ca, P, Mn, Sr, Mo and Pb were in linearity proportion with the polarity of extraction solvent. The inorganic and organic species of the elements were well separated by HPLC-ICP-MS under the following conditions: C₁₈ bonded silica gel column, 0.10 mol/L nitric acid and super pure water as the mobile phase, flow rate of 0.4 mL/min and injection volume of 20 μL.

Qualitative and Quantitative Determination of Inorganic Phosphate from Human Urine and Serum by Yb(Ⅲ) Ion and Pyrocatechol Violet

YIN Cai-Xia, HUO Fang-Jun, YANG Pin

2006, 27(10):  1849-1852.  doi:

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Phosphate is involved in a number of important biomineralization processes such as bone formation as well as pathological processes such as the genesis of renal stones. Consequently, its determination in biological fluids is important. The determination of free phosphate ion in human urine and serum is very important, since they have diagnostic value in some clinical cases. Here we report a simple and sensitive method to determine phosphate in urine and serum. This new ensemble was prepared by adding ytterbium chloride and pyrocatechol violet in a 2∶1 molar ratio in aqueous solution of 10 mmol/L HEPES buffer at pH=7.0. With the addition of urine or serum sample, in UV-Vis absorption spectra the maximum absorption peak gradually shifts from 623 nm to 444 nm and the ensemble results in a change of color from blue to yellow. The ensemble exhibits an excellent selectivity for phosphate over other constituents of urine and serum. Mean urine and serum phosphate concentrations found in healthy individual are 23.25 and 1.14 mmol/L respectively. The detection results are basically consistent with those of normal excretion of phosphate.

研究简报

Preparation and Characterization of Cu(Ⅱ)\|Molecularly Imprinted Polymer

ZHU JianHua, LI Xin, QIANG Liang-Sheng

2006, 27(10):  1853-1855.  doi:

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Cu(Ⅱ)-Molecularly imprinted polymer was prepared by the emulsion polymerization approach by using oleic acid and divinylbenzene as the functional monomer and the cross-linker separately. The results show that the imprinted polymer adsorbed Cu(Ⅱ) in water with a high velocity and favorable selectivity through copper ion entering into its cavity and replacing hydrogen of hydroxyl group. Autosorb instrument was used to examine the properties and structure of the imprinted polymer. Many holes in surface of the Cu(Ⅱ)-molecule imprinted polymer which possess high availability are filled because of adsorption.

Simultaneous Detection of Multiplex SNPs by Adapter-ligation Mediated Allele-specific Amplification(ALM\|ASA) on CE-chip Electrophoresis Device

WANG Wei-Peng^1,2, NI Kun-Yi², ZHOU Guo-Hua^1,2

2006, 27(10):  1856-1858.  doi:

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To detect multiplex single nucleotide polymorphisms(SNPs) simultaneously, a new method was established by combining ALM-ASA with microfabricated CE-chip. Taking the CYP2D6 gene as an example, six SNPs, 100C>T(P34S), 1707T>del(frameshift), 1758G>T(stop codon), 2470T>C, 2549A>del(frameshift) and 2613AGA>del(K281del), were typed by four steps consisting of preamplification, digestion and ligation, allele-specific amplification, and amplicon separation by chip-CE. The genotyping results of 20 different genome samples by 6-plexed ALM-ASA were completely consistent with those obtained by polymerase chain reaction-restriction fragment length polymorphism analysis(PCR-RFLP), indicating that the multiplex approach established in this study was accurate and inexpensive. As the small reagent consumption by CE-chip device, a low cost for SNP typing was achieved together with the multiplex PCR technology proposed in this report. Neither modification of microchip channels nor clean-up process of PCR products was required; this greatly shortens the whole time for SNP typing.

Mercaptoacetic Acid Self-assembled DNA Electrochemical Biosensor for Detection of NOS Gene Sequence

SUN Wei, SHANG Zhi-Mei, YANG Mao-Xia, JIAO Kui

2006, 27(10):  1859-1861.  doi:

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A NOS gene electrochemical biosensor was prepared by covalently mmobilizing of NOS ssDNA sequence on the mercaptoacetic acid monolayer self-assembled gold electrode with the help of N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride(EDC) and N-hydroxysuccinimide(NHS). By using methylene blue as the electrochemical indicator, the increase of cathodic peak current was in linear with the concentration of complementary ssDNA in the concentration range of 5.0×10^-8—1.0×10^-4 mol/L with the linear regression equation as ΔI_pc=1.10lgc+8.25(n=8, γ=0.998 5) and the detection limit as 3.60×10^-8 mol/L(3σ).


High-pressure Microwave-assisted Extraction of Baicalin from Niuhuang Shangqing Pills

WANG Yu-Tang, YU Yong, WANG Zi-Ming, ZHOU Xin, BAI Li-Fei, DING Lan, ZHANG Han-Qi

2006, 27(10):  1862-1864.  doi:

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High-pressure microwave extraction was used to extract the baicalin in Niuhuang Shangqing Pills. According to viscidity of honey pills, the sample was painted on the surface of unshaped glass slide, and then the glass slide was placed in extraction vessel and baicalin in the sample was extracted by microwave radiation. High performance liquid chromatograph(HPLC) was used to determine the content of baicalin. The effects of the microwave extraction pressure and time on the extraction yield of baicalin were also examined. The baicalin in Niuhuang Shangqing Pills obtained from five different factories was determined. The results indicate that the microwave extraction of method B(smearing) is obviously superior to the microwave extraction of method A(slicing), ultrasonic extraction and sexhlet extraction. This method proposed in the paper has advantages such as quickness, convenience and high extraction yield.

研究论文

Electrochemical Synthesis and Characterization of Transition Metal Cu(Ⅱ)， Zn(Ⅱ), Ni(Ⅱ) Complexes with a Schiff Base Ligand from Salicylidene and L-isoleucine

CHU Dao-Bao, ZHANG Xiu-Mei, ZHANG Li-Yan, YING Xiao-Juan

2006, 27(10):  1865-1868.  doi:

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The direct electrosynthesis of Cu(Ⅱ), Zn(Ⅱ) and Ni(Ⅱ) complexes of salicylideneamino acid was accomplished by electrochemical dissolution of sacrificial metallic anodes in an acetonitrile solution of the ligand salicylideneamino acid in notmembrane electrolytic cell. The complexes were characterized by FTIR, elemental analysis, UV-Vis spectra and thermal analysis. And the electrochemical property of Cu(Ⅱ) complex was examined. The complex formula is ML·nH₂O, where L=L-isoleucine Schiff base, M=Cu(Ⅱ), Zn(Ⅱ), Ni(Ⅱ), n=1,1,2. The complexes have a similar spatial structure and the ligand was tricoordinate. The electrochemical efficiency E_f is near 0.5 mol/F[for Zn(Ⅱ), Ni(Ⅱ) complexes] and 1.0 mol/F[for Cu(Ⅱ) complex]. In the Cu(Ⅱ) complex, E^r_1/2 of Cu(Ⅱ)L/Cu(Ⅰ)L couple was -0.79 V(vs. SCE).

Synthesis of Novel 1,6-Disubstituted-5,6-dihydropyrrolo[1,2-f]pteridines

ZHENG Lian-You, DANG Qun, GUO Si-Gen, XIANG Jin-Bao, BAI Xu


2006, 27(10):  1869-1872.  doi:

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A methodology to prepare novel 1,6-disubstituted-5,6-dihydropyrrolo-[1,2-f]pteridine derivatives has been developed. The key in this synthesis is a Pictet-Spengler type reaction. The Clauson-Kass reaction of 4,6-dichloro-5-amino-pyrimidine with 2,5-dimethoxyltetrahydrofuran, followed by amination of one of the chloro groups, resulted in 4-amino-6-chloro-5-(1H-pyrrol-1-yl)pyrimidine. Subsequently, 4-amino-6-chloro-5-(1H-pyrrol-1-yl)pyrimidine reacted with an aldehyde or aliphatic ketone in the presence of toluenesulfonic acid in refluxing toluene to yield an imine intermediate, which underwent an intramolecular electrophilic substitution to lead to the corresponding dihydropyrrolo[1,2-f]pteridines in moderate to good yields. The chloro group on the newly formed heterocycle could be readily replaced by a nucleophile, such as an amine. This strategy provides a convenient way to access to a class of heterocyclic compounds with possible interesting biological activities.

Synthesis of Cyclometalated Platinum Complexes Containing Triarylamino Group and Their Photophysical and Electrochemical Properties

LIU Jian, LIU Yu, LUO Cui-Ping, LIU En-Hui, YANG Yu-Ping, GAN Quan, ZHU Mei-Xiang, ZHU Wei-Guo

2006, 27(10):  1873-1876.  doi:

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Two cyclomatetaled platinum (Pt) complexes containing triarylamine moiety were synthesized by Ullmann and cyclometalated reactions, which are [N,N-(4-tert-butylphenyl)-4-(2'-pyridyl)aniline-C3, N1] (diphenoxylmethane) Pt(Ⅱ) [(BuPhNPPy)Pt(DBM)] and [N,N-diphenyl-4-(2'-pyridyl)aniline-C3, N1] (diphenoxylmethane) Pt(Ⅱ) [(PhNPPy)Pt(DBM)]. The influence of reaction condition and molecular structures on the synthesis was investigated. The cyclometalated yield was 87.0%. The spectral and electrochemical properties of these Pt complexes were also studied. The results showed that both complexes had intense UV-Vis absorption and photoluminescence properties. The oxidation and reduction potentials of (PhNPPy)Pt(DBM) and (BuPhNPPy)Pt(DBM) are 0.80, -1.63 V and 0.93, -1.45 V respectively. The maximum UV-Vis absorption and photoluminescence wavelengths of (PhNPPy)Pt(DBM) are 346 and 537 nm respectively and these of (BuPhNPPy)Pt(DBM) have a red-shifted wavelength of 7—13 nm.


Synthesis and Bioactivity of Salicylic Acid Saccharide Carboxylate

ZANG Hong-Jun¹, LI Zheng-Ming², NI Chang-Chun³, SHEN Zhou³, FAN Zhi-Jin², LIU Xiu-Feng²

2006, 27(10):  1877-1880.  doi:

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The plant activators such as salicylic acid and acetosalicylic act as a regulary molecue in plants which can stimulate the biosynthesis of phytoalexin to inhibit the growth of micobial patogens. In order to investigate the synergic effect of the glucose and salicylic acid, ten new glycosyl esters of salicylic acid were synthesized by the reaction of salicylic acid and acetosalicylic acid with acetylated glycosyl bromide. The structures were confirmed by elemental analysis and ¹H NMR. The ¹H NMR spectra showed that they were β-isomer. Bioassay results indicate that several compounds show a better induced activity against pathogen infection than salicylic acid.

Comparative Proteomics Analysis of Rat Mesenchymal Stem Cells During Induced Differentiation

YE Neng-Sheng, ZHANG Rong-Li, LUO Guo-An, ZHANG Hui-Liang, ZHAO Yan-Feng, ZHANG Min, WANG Yi-Ming

2006, 27(10):  1881-1886.  doi:

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Bone marrow mesenchymal stem cells(MSCs) can be differentiated into cardiomyocytes with the induction of 5-azacytidine in vitro, and the induced cardiomyocytes can be used for cell transplantation for cardiac diseases. In the present study, the protein profiling of rat MSCs was investigated by two-dimensional gel electrophoresis(2DE). According to the data analysis by PDQuest, 24 protein spots showed up-regulation, and 14 protein spots showed down-regulation during MSCs differentiation. However, there were 9 protein spots expressed only in undifferentiated MSCs, and 19 protein spots were detected in differentiated cells but not MSCs. Altered proteins were digested by trypsin and subjected to MALDI-TOF-MS analysis for peptide mass fingerprinting(PMF). Fifty-four proteins were identified successfully from NCBInr and/or SWISS-PROT databases. Among the identified proteins, there were 20 proteins showed up-regulation, and 4 proteins down-regulated during the induced differentiation of MSCs. According to the previous reports of their function, these regulated proteins may be involved in the differentiation of rat MSCs. Our data suggested that proteomics can be used to highlight the study of molecular mechanism of cell differentiation.

Uptake and Translocation Behavior of New Fungicide Flumorph in Cucumber Plant

ZHU Shu-Sheng¹, LIU Xi-Li¹, LI Jian-Qiang¹, SI Nai-Guo²

2006, 27(10):  1887-1890.  doi:

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Uptake, translocation, and distribution behavior of flumorph in cucumber seedling were determined by biological test and the high performance liquid chromatography(HPLC) method. The results showed that flumorph was a systemic fungicide and translocated upwards readily in trachea of the xylem with transpiration but not in the phloem, so it was easily accumulated in leaves. Flumorph also showed a translaminar activity and redistribution activity in intact plants, but can not translocate from one leaf to another in either acropetal or basipetal direction. For these reasones, flumorph can protect whole plant after being applied in soil, but be failed to protect new leaves after foliar application. CCCP, temperature, the properties of amino acid and sucrose, as well as the pH values of solvents had no significant affect on the intake of flumorph by cucumber, indicating that it tended to uptake and transport flumorph passively.

研究简报

Cleavage of λDNA by Seryl-histidine Planted Peptide Dendrimer

HE Jun, MA Yuan, ZHAO Yu-Fen

2006, 27(10):  1891-1893.  doi:

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Artificial nucleic acid cleavage agents have received considerable attention due to their very important applications in biochemistry and molecular biology. Seryl-histidine is a dipeptide possessing DNA, protein and ester cleavage activity. Since peptide dendrimers have a lot of unique physical and chemical properties compared to normal peptide chain and have a great varieties of applications in biological areas, two and four branched seryl-histidine planted peptide dendrimers were synthesized by Fmoc solid phase peptide synthesis approach. The products were purified by HPLC and characterized by ESI-MS. Their DNA cleavage activities were tested by means of Agarose Gel Electrophoresis. In the cleavage reaction, peptide dendrimer showed a strong combining inclination to DNA, highly concentrated dendrimer solution can quench the fluorescence of EB. Even though, the DNA cleavage activity of the dendrimers was lower than that of seryl-histidine dipeptide monomer.

Application of Chiral Spiro Monophosphorus Ligands in Rhodium-catalyzed Asymmetric Hydroformylation

FAN Bao-Min¹, XIE Jian-Hua², ZHOU Zhang-Tao², ZHANG Qi², TU Yong-Qiang¹, ZHOU Qi-Lin²

2006, 27(10):  1894-1896.  doi:

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The application of three types of chiral spiro monophosphorus ligands in rhodium-catalyzed asymmetric hydroformylation was investigated. The chiral spiro phosphoramidite ligands(SIPHOS) were found to be efficient in this reaction, and the alkyl groups on the amino moiety of SIPHOS ligands played a critical role in the control of regio-selectivity and enantioselectivity of the reaction, with i-Pr being the best choice. Under the optimized reaction conditions, styrene and its derivatives could successfully react as substrates in excellent yields and regio-selectivities, and modest level of enantioselctivities.

Synthesis and Crystal Structure Characterization of 2,2'-Diphenyl-1,4-benzoxazin-3(4H)-one under Microwave Irradiation

WEI Wen-Ping¹, ZHANG Dan-Feng¹, ZHAO Ping¹, YUAN Qiao-Long¹, HUANG Bao-Tong^1,2


2006, 27(10):  1897-1899.  doi:

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Benzoxazinone usually exists in many kinds of plants. It is applied in prepharmacy synthesis, and bioactivity studies, and has been prepared from O-aminophenol and chrol- with alkine and solvent by refluxing for a long time. In this work, 2,2'-diphenyl-1,4-benzoxazin-3(4H)one was solvent-free synthesized under microwave irradiation. The configuration and conformation of the product were determined by ¹H NMR, IR, MS, elementary analysis and X-ray crystal analysis. The results of X-ray crystal analysis show that the compound crystallizes in a triclinic system, space group P1, cell parameter a=0.840 7(1) nm, b=0.845 1(1) nm, c=2.254 1(3) nm, α=96.111(3)°, β=97.196(3)°, γ=90.229(3)°, V= 1.579 6(4) nm³, Z=4, D_c=1.267 Mg/m³, F(000)=632.0, μ=0.08 mm^-1. In the compound, oxazinone ring is shown chair conformation, two benzene rings is placed in two sides of oxazinone ring distortedly. In crystal state, a centrosymmetric dimmer is formed via hydrogen bonds generated from amides of two near molecules. The benzene rings in a same chemical environment are paralleled by a distance of 0.260 9 nm. It displays aromatic π-π stacking interactions.

Using SZOTT Descriptors for the Development of QSAMs of Peptides

LIANG Gui-Zhao^1,2,3, MEI Hu^1,3, ZHOU Yuan^1,2,3, YANG Shan-Bin^1,3, WU Shi-Rong^1,2, LI Zhi-Liang^1,2

2006, 27(10):  1900-1902.  doi:

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A new descriptor, namely scores vector of zero dimension，one dimension，two dimension and three dimension (SZOTT), was derived from principle components analysis of a matrix of 1 369 structural variables including 0D, 1D, 2D and 3D information for 20 coded amino acids. SZOTT scales were then employed to express structures of 20 thromboplastin inhibitors and 34 bactericidal peptides. The correlation coefficients of both whole calibration (R²=R²_cu) and of cross validation (Q²=R²_cv) for the multiple-variable models by classical partial least squares (PLS) and orthogonal signal correction-partial least squares (OSC-PLS) of 20 thromboplastin inhibitors were 0.989 and 0.748, 0.994 and 0.936, respectively. R² and Q² for the models by PLS and OSC-PLS of 34 bactericidal peptides were 0.619 and 0.406, 0.910 and 0.503, respectively. Satisfactory results obtained showed that structural information related to biological activity in both data sets could be described by SZOTT which included plentiful information related to biological activity, and which was conveniently operated and easy interpreted, also predictive capability of models were relative robust. There is a high prospect for SZOTT wide applications on quantitative sequence-activity modeling (QSAM) of peptides.

研究论文

Theoretical Studies on the Low-lying Excited States of Ethyl Bromide and Its Cation

WEI Zi-Zhang¹, LI Bu-Tong¹, PAN Qing-Jiang², ZHANG Hong-Xing¹

2006, 27(10):  1903-1906.  doi:

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Although for carbon and hydrogen the basis set of atomic natural orbitals(ANO-S) has been used in the all calculations, the basis set of ANO and effective core potential(ECP) have been used for the bromine, respectively. Using complete active space selfconsistent field(CASSCF) method with these two species correlation consistent basis set, the ground state and low-lying excited states of ethyl bromide molecule and cation were studied. Meanwhile, taking into account the dynamic correlation effects, the second-order perturbation(CASPT2) method was used to obtain more reliable energies. For the ethyl bromide molecule, the optimized geometry of the ground state with ANO basis set agrees better with the experimental values than those with ECP basis set. The adiabatic ionization energies were obtained from the corresponding molecule and cation states optimized, the first and second ionization energies and the energetic gap of the first two electronic states were of somewhat difference with the experimental values at the CASSCF level. The results were improved with the CASPT2 method, in which the first two ionization energies differ from the experimental data by just 0.359 3 and 0.449 6 eV using the ANO basis set. Furthermore, the harmonic frequencies of the title molecule were calculated at the CASSCF/ANO level, the frequencies agree well with the experimental values.

Selective Catalytic Reduction of NO with Ammonia over Fe Promoted Mo/ZSM-5 Catalysts

LI Zhe, CHEN Bing, HUANG Wei, XIE Ke-Chang


2006, 27(10):  1907-1911.  doi:

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The Fe-Mo/ZSM-5 catalysts with different Fe/Mo molar ratios were prepared by using impregnation method. The activity of Fe-Mo/ZSM-5 catalysts for selective catalytic reduction of NO with ammonia and the effects of reaction conditions were also studied. It was found that Fe-Mo/ZSM-5 is more active than both of Mo/ZSM-5 and Fe/ZSM-5 separately, and it exhibits the best performance for SCR reaction when n(Fe)/n(Mo) ratio is 1.5, for which the highest NO_x conversion reached 96% at the temperature of 430 ℃. The experiment results also show that Fe-Mo/ZSM-5 catalyst has a good stability of SCR reaction, for higher catalytic activity was gained under the condition of high space velocity and varied O₂ concentrations. The bulk phase and surface structures were determined by XRD, XPS techniques respectively. The results show that there is a strong interaction among Fe, Mo and HZSM-5, and the surface Mo_3d percentage is the largest when n(Fe)/n(Mo) ratio is 1.5, which may be related to its better catalytic performance for catalytic reduction of NO. It is also important to notice that NO₂ was not detected during the XPS measurement, and NO was the main species during SCR reaction on the surface of Fe-Mo/ZSM-5 catalyst. From this it can be deduced that NO is directly reacted with ammonia to form nitrogen and water on the surface of the catalyst.

Heterogeneous Reaction of Formaldehyde on Surface of α-Al₂O₃ Particles

XU Bing-Ye, ZHU Tong, TANG Xiao-Yan, DING Jie, LI Hong-Jun

2006, 27(10):  1912-1917.  doi:

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Formaldehyde is one of the most important carbonyl organic compounds. Heterogeneous reactions of formaldehyde on the surfaceof oxides of crustal elements could be an import sink for formaldehyde in atmosphere. In this study, the kinetics of the heterogeneous reaction of formaldehyde on the surface of α-Al₂O₃ were in situ investigated by diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS) over the temperature range of 273—333 K. The adsorbed species, formate(Ⅰ), dioxymehtylene(Ⅱ), polyoxymethylene(Ⅲ) and formaldyhyde(Ⅳ), on α-Al₂O₃ particles were identified with infrared spectrum: on the surface of α-Al₂O₃ particles, formaldyhyde was oxidized at first to dioxymehtylene which was further oxidized to formate. The reaction order was determined as 0.81±0.05, and the initial reactive uptake coefficients at 293 K were calculated with the geometric and the BET specific surface areas are(2.3±0.5)×10^-5 and (9.4±1.7)×10^-9, respectively. The apparent activation energy of the reaction was etermined as 33.5 kJ/mol.

Effects of Surface Modification with DBS Groups on Gas Phase Photocatalytic Performance of Nanosized TiO₂

JING Li-Qiang^1,2, XUE Lian-Peng¹, WANG Bai-Qi¹, XIN Bai-Fu¹, FU Hong-Gang^1,2, SUN Chia-Chung²

2006, 27(10):  1918-1922.  doi:

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Sodium dodecylbenzenesulfonate groups(DBS)-modified TiO₂ nanoparticles were directly prepared by a sol hydrothermal method, the effects of DBS modification on photocatalytic performance, including mainly activity and lifetime, of nanosized TiO₂ in the degradation of gaseous n-C₅H₁₂ were studied, together with the affecting mechanism of DBS modification by means of surface photovoltage spectroscopy(SPS) and photoluminescence(PL). The results show that the modification with DBS molecule groups can inhibit the crystallite growth, improve particle dispersibility, enhance the capability to adsorb organic substance, and increase separation rate of photoinduced charges, which are responsible for the increase in the photocatalytic activity. Interestingly, the lifetime of the surface-modified photocatalyst does not decrease, compared with that of unmodified sample, demonstrating that DBS groups are relatively stable. In addition, the photocatalytic reaction of gaseous n-C₅H₁₂ on TiO₂ follows a Langmuir-Hinshelwood model, and also is a pseudo-first order reaction.

CoSn Alloys as Negative Electrode Materials for Lithium-ion Batteries

ZHANG Jing-Jun, XIA Yong-Yao

2006, 27(10):  1923-1926.  doi:

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We have prepared a series of Co-Sn alloys by mechanical alloying technology as the negative electrode materials for lithium-ion batteries. The effects of addition of carbon and further heat treatment on the phase composition and the electrochemical performance of the alloys were investigated. X-ray diffraction characterization shows that Co-Sn[n(Co)∶n(Sn)=3∶1] alloys after mechanical alloying can be indexed to the mixture phases of Co₃Sn₂ and Co despite of the heat treatment process, however, carbon-added Co-Sn[n(Co)∶n(Sn)∶n(C)=3∶1∶1] alloys consisted of the mixture phases of CoSn₂ and Co, and turned to CoSn and Co₃Sn₂ phase after heat treatment at 400 and 600 ℃, respectively. The results of charge/discharge test show that the charge/discharge capacity decreases in the following order: CoSn₂>CoSn>Co₃Sn₂, but the cycling profile was improved.

Kinetics of Micellization of Quaternary Ammonium Gemini Surfactants

LI Dong-Hua, XU Xiao-Ming, ZHOU Wen-Ting, HAN Guo-Bin

2006, 27(10):  1927-1931.  doi:

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The stopped-flow technique combined with Aniannson-Wall theory was used to study the kinetics of micelle formation-breakup in aqueous solution of quaternary ammonium Gemini surfactant of the alkanediyl-α-ω-bis(dodecyldimethyl ammonium bromide) type with alkanediyl=(CH₂)₂, (CH₂)₃, (CH₂)₄ and (CH₂)₆. The kinetic results show that the relaxation time of micelle formation-breakup τ₂ is dependent on the spacer chain length, the concentration of the surfactants, the concentration of antiionic and the temperature. The quaternary ammonium Gemini surfactants show a decrease in relaxation time of micelle formation-breakup, as the spacer chain length is increased. Above 293 K, the 1/τ₂ comes to a minimum value when the concentration of anti-ionic is increased. The effect of nucleus formation enthalpy provides evidence in support of our proposed mechanism of the micelle formation-breakup for quaternary ammonium Gemini surfactant with different spacer chain lengths.

Theoretical Calculation of Reaction Mechanisms for ^·C₃H₅+O₂


KONG Zhi-Guo¹, REN Ai-Min¹, FENG Ji-Kang^1,2, GAN Lin-Feng¹, SUN Chia-Chung¹

2006, 27(10):  1932-1936.  doi:

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The theoretical calculation on the mechanisms for C₃H₅+O₂ reaction was carried out based on the quantum chemical calculating methods. The calculation was undertaken at B3LYP level with the 6-311G(d,p) basis set and the geometries and transition states were ascertained. The most favorable reaction pathway leading to the major CHO+CH₃CHO products is as follows: R(CH₃CH=^·CH+O₂)→m1(trans-CH₃CH=CHOO)→m2(form COO three-membered ring)→m3(C—C bond ruptures, at the same time, forms CH₃CH—O—CHO)→P2(C—O bond ruptures and form CH₃CHO+CHO). This system was also compared with some others such as the system of C₂H₃.

Compatibility of a Novel Composite Microporous Polymer Electrolyte with Anode of Li-ion Batteries

CHEN Zuo-Feng, JIANG Yan-Xia, XU Jin-Mei, ZHUANG Quan-Chao, HUANG Ling, DONG Quan-Feng, SUN Shi-Gang

2006, 27(10):  1937-1940.  doi:

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In this paper, a novel composite microporous polymer electrolyte that is made of poly(vinylidene fluoride-co-hexafluoropropylene)(PVdF-HFP) and mesoporous SBA-15 was prepared(designated as SBA-15 CMPE). Electrochemical impedance spectroscopy(EIS) was applied to investigate the effects of the storage time, cyclic voltammetry(CV) measurement, constant current polarization and ambient temperature on the Li/SBA-15 CMPE interface properties. The polymer film composite integrative electrode(designated as MCMB/SBA-15 CMPE) was prepared through a process that the membrane solution was cast directly on the mesocarbon microbead(MCMB) electrode with water-solubility bond. The result of CV shows that the model cell with three-electrode based on the MCMB/SBA-15 CMPE displayed a good cyclical performance. The EIS result reveals the process of formation, growth and stabilization of solid electrolyte interphase(SEI) film on MCMB/SBA-15 CMPE electrode during the first cathodic polarization.

Isomeric Phenomenon and the Maximum Hardness Principle

ZHANG Yi-Liang¹, YANG Zhong-Zhi²


2006, 27(10):  1941-1944.  doi:

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The hardnesses of more than 700 isomers were calculated by using atom-bond electronegativity equalization method. By comparing their hardnesses with the relative stabilities derived from their standard enthalpies of formation, it is found that the maximum hardness principle is not obeyed for most of these isomers.

Electrooxidation of Hydroxypivalaldehyde at Ti/Sb₂O₅-SnO₂ Electrode

YU Jian-Guo, CAO Xue-Jing, ZHANG Heng-Bin, ZHANG Yu-Min, LI Ke-Chang

2006, 27(10):  1945-1948.  doi:

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Electrooxidation of hydroxypivalaldehyde was studied at a Ti/Sb₂O₅-SnO₂ electrode using sulfuric acid as a supporting electrolyte in an electrolytic cell wi
th a proton exchange membrane. The linear scan voltammograms showed the current densities at the same electrode potential increased obviously after hydroxypivalaldehyde was added, this fact indicates that the electrode has an electrocatalytic activity to hydroxypivalaldehyde oxidation. Using potentiostatic electrolysis method, the effects of hydroxypivalaldehyde concentration, pH, temperature and anode potential on the selectivity and the current efficiency of the hydroxypivalaldehyde electrooxidation were investigated, it can be found that the effect of pH is the most obvious.

Effect of Substituents on the Two-photon Absorption Properties for Chromophores Based on Dithienothiophene

ZHOU Shu-Lan, ZHAO Xian, SUN Xue-Qin, CHENG Xiu-Feng

2006, 27(10):  1949-1952.  doi:

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In order to investigate the effect of substituents on the two-photon absorption properties(TPA), the one- and two-photon absorption properties were theoretically studied by using ZINDO/SOS method. The results indicate that the compounds based on DTT exhibit strong TPA. Comparing to the unsubstituent molecule, it was found that bis-acceptor substituted molecules possess of drastic enhancement of the TPA cross section at the shorter wavelength absorption peaks and bis-donor substituent can increase the TPA cross section at the longer wavelength absorption peaks.

Photoelectrochemical Studies on TiO₂-ZnO Composite Nanostructure Electrodes

HAO Yan-Zhong^1,2, LU Jun-Ai², CAI Chun-Li²


2006, 27(10):  1953-1957.  doi:

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The nanostructure electrodes were prepared with composite TiO₂-ZnO nanoparticles via the method of homogeneous precipitating by using Ti(SO₄)₂ and Zn(NO₃)₂. The photoelectrochemical performance of the nanostructure electrodes were studied. The experiment results show that the highest IPCE was obtained with the composite TiO₂-ZnO nanoparticles prepared at n[Ti(SO₄)₂]∶n[Zn(NO₃)₂]=3∶1 and calcining temperature 530 ℃. The photoelectrochemical performances of the ITO/TiO₂/RuL₂(SCN)₂∶2TBA and ITO/TiO₂+ ZnO/RuL₂(SCN)₂∶2TBA electrodes were investigated. The highest IPCE was also obtained with the composite TiO₂-ZnO nanoparticles prepared at n[Ti(SO₄)₂]∶n[Zn(NO₃)₂]=3∶1 and calcining temperature 530 ℃. ITO/TiO₂/Poly(3-methythiophene)(PMeT) and ITO/TiO₂+ZnO/PMeT were also studied. The p-n heterojunction existed in ITO/TiO₂/PMeT and ITO/TiO₂+ZnO/PMeT, which favored the separation of electron-hole pairs. The ITO/TiO₂+ZnO/PMeT electrode obviously increased the photo-current conversion efficiency by ten times comparing with that of the ITO/TiO₂/PMeT electrode.

DFT Studies on Structure and Properties of Metallofullerene Y＠C₃₆

JIA Hu-Sheng, WANG Li-Ping, HAN Pei-De, LIU Xu-Guang, XU Bing-She

2006, 27(10):  1958-1961.  doi:

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The geometries of C₃₆(D_6h symmetry) and its endohedral metal derivative Y＠C₃₆ were optimized at the GGA/PW91 level by using DFT approach. The energy and stability of Y＠C₃₆ were discussed according to the different positions of the dopant in the cage. Also some properties of optimized C₃₆ and Y＠C₃₆ were computed, such as energy level, density of states, optical properties, and so on, in order to investigate the influence of the doped Y atom on the structure and property of the cage. Results show that Y＠C₃₆ are most stable when Y is on the centre and Y＠C₃₆ is more stable than C₃₆. The dope of Y narrows the band gap of C₃₆ and improves the conductivity and chemical reactivity. And the dope blue-shifts the position of absorption peak and reduces absorption strength.

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Studies on Electrochemical Behavior of LaNi_4.7Al_0.3 Single Micro-particle Electrode


LIU Jun, YANG Yi-Fu, SHAO Hui-Xia, GAO Feng, XIONG Yue, CHEN Wei-Hua

2006, 27(10):  1962-1964.  doi:

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A new single micro-particle electrode(SMPE) fabrication technique——the inlaid SMPE technique was introduced in this paper. The preparation procedure of an alloy SMPE was described in detail. Based on the SMPE technique, the electrochemical behavior of LaNi_4.7Al_0.3 spherical particles with two different radii was investigated. The results of CV study showed that more detailed electrochemical information of the alloy can be provided on the alloy SMPE as compared with that on the composite alloy electrode. The results of potential step study depict that H diffusion coefficient in LaNi_4.7Al_0.3 keeps almost constant when the size of the alloy particle changes, and the diffusion coefficient measured on the alloy SMPE[(2.5—2.6)×10^-9 cm²/s] is about one order larger than that detected on the composite alloy electrode.

研究论文

Preparation and Characterization of Cationic Chitosan-modified Poly(D,L-|lactide-co-glycolide) Copolymer Nanospheres


GUAN Xi-Peng, QUAN Da-Ping, LIAO Kai-Rong, MAI Kan-Cheng

2006, 27(10):  1965-1968.  doi:

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Chitosan(CHS)-modified poly(D,L-lactide-co-glycolide) copolymer(PLGA)(PLGA/CHS) nanospheres with cationic surface were prepared by emulsion-solvent-diffusion(O/W) method. The preparation conditions were optimized by orthogonal factorial design. The diameter of PLGA/CHS nanospheres is in the range of 150 nm to 200 nm, and the ζ potential of PLGA/CHS nanospheres was up to 55 mV when pH was 4. The most important factor which affects the diameter of PLGA/CHS nanospheres is the concentrations of PLGA solutions, whereas the major factors which affect the ζ potential of PLGA/CHS nanospheres are the concentrations of CHS solutions and the molecular weight of CHS(M_{w, CHS}). On the other hand, the pH-value of aqueous phase also affected the ζ potential of PLGA/CHS nanospheres obviously. The optimized conditions for preparing the smallest diameter of PLGA/CHS nanospheres with a higher positive potential were: ρ(CHS)=3 mg/mL, ρ(PLGA)=10 mg/mL, V_o/V_a=1/4 SEM micrograph reveals that the morphology of PLGA/CHS nanospheres was regular. And the results of fluorescence inverted micrograph and XPS analysis indicate that each of the PLGA nanospheres was encapsulated by CHS. The information obtained from this study is useful for preparing CHS-modified particles and the cationic nanospheres hold promise as injectable spheres that are suitable for drug delivery, gene transfection and tissue engineering applications.

Grafting Acrylic Acid onto Pre-irradiated Polypropylene by Reactive Extrusion

CAI Chuan-Lun^1,2, XIN Zhi-Rong³, YAO Zhan-Hai¹, SHI Qiang^1,2, YIN Jing-Hua¹

2006, 27(10):  1969-1973.  doi:

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Polypropylene functionalized with acrylic acid(PP-g-AA) was prepared by coupling electron beam(EB) pre-irradiation treatment with reactive extrusion process. The grafting samples were characterized by chemical titration, FTIR, polarized light microphotographs, DSC and WAXD. The study showed that grafting degree(Gd) increased with increasing irradiation dose and then leveled off; the Gd increased linearly with the AA concentration rising. It was observed that crystallization temperature of the grafted sample increased and crystallite size decreased, which can be attributed to the heterogeneous nucleating action of grafting chain. The MFR and mechanical properties measurements proved that serious degradation of PP occured in the stage of pre-irradiation and extruding process. Meanwhile, a mechanism of grafting reactions was proposed tentatively.

Interaction of Polyurethane and Terbium Acetylacetonate Composite

LIU Xin-Hai¹, ZHAO Ying¹, WANG Du-Jin¹, LIU Zhi², SUN Xian-Yu², WU Jin-Guang², XU Duan-Fu¹

2006, 27(10):  1974-1977.  doi:

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Polyurethane, terbium acetylacetonate and their composite were synthesized and subsequently characterized by rheology and FTIR spectroscopy. FTIR results indicate that terbium ions coordinated with the carbonyl groups in polyurethane molecular chains. Rheological property measurement shows an increase in the polyurethane solution viscosity, indicating that there exist obvious interactions between lanthanide ions and polyurethane in solution. The mechanical property test indicates that the addition of lanthanide complex enhanced the mechanical performances of polyurethane, such as tensile strength and elongation at break.

Effect of Crystal Water on Coordination Crosslinking Reaction Between Copper Sulfate and Acrylonitrile-butadiene Rubber


YUAN Xiao-Fang, WU Guo-Zhang, WU Chi-Fei


2006, 27(10):  1978-1981.  doi:

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The effect of crystal water on coordination crosslinking reaction of acrylonitrile-butadiene rubber(NBR) filled with copper sulfate particles containing pentahydrate(CuSO₄·5H₂O) was investigated in this paper. The NBR could be crosslinked in the existence of CuSO₄ during heat pressing, without addition of any other crosslinking agents. The coordination crosslinking reaction is influenced by many factors, such as the temperature and time of heat pressing, the kind and content of metal salts and etc.. In addition, dynamic mechanical analysis(DMA), differential scanning calorimetry(DSC), scanning electron microscope(SEM), equilibrium swelling method and tensile test were performed for a comparison of coordination crosslinking behavior between CuSO₄·5H₂O/NBR and CuSO₄/NBR. The results show that the crystal water in CuSO₄·5H₂O can accelerate the coordination crosslinking reaction between CuSO₄ and NBR.

Chemical Damage of Carbon Fibers During Cf/SiC Preparation by PIP


WANG Jian-Fang, WU Wen-Jian, HU Bi-Ru, MAN Ya-Hui, CHEN Zhao-Hui


2006, 27(10):  1982-1985.  doi:

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The chemical damage of carbon fibers during the preparation of Cf/SiC composites by precursor infiltration pyrolysis(PIP) with polycarbosilane(PCS) was investigated systematically. The results show that the chemical damage includes interface reaction and interface diffuse, in which the active groups of PCS hardly react with carbon fibers. However, the oxygen and impurities can hurt carbon fibers largely. Silicon diffuses to carbon fibers more and more with the increasing of heat treatment time, and it is the main way of chemical damage of carbon fibers. The chemical damage of carbon fibers is slight in the first cycle, and turns heavier in the following cycles.

Research of IFN-encapsulated Liposomes Regulated by Lecithin Characteristics and Preparation Methods

WANG Yan^1,2, ZHANG Shui-Hua², LI Yun-Fu², LI Jiu-Li², CAO Shu-Gui

2006, 27(10):  1986-1990.  doi:

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According to the physical and chemical characteristics of interferon and Lecithin, we selected four kinds of lecithin compounds as the liposomal membrane aterials, prepared liposomes by three methods, investigated liposomal shape, size distribution and the entrapment efficiency(EE) for a 60 d period to explore their influence factors of stability. The result shows the liposome made from DMMPC+DPPC+SA by film evaporation method has a good EE and size stability for 2 months. The size range is from 200 nm to 300 nm, the EE range is from 30%—40%.

Effect of Epoxy Resin Compatilizer with Four Side Methyl Groups on the Dispersion Degree of Carbon Black in SBR

MI Xin-Yan¹, LIU Yan-Li¹, ZHANG Chun-Ling², YU Wen-Zhi¹, NA Hui¹

2006, 27(10):  1991-1995.  doi:

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A synthesized epoxy resin(TMBP) with four side methyl groups was selected as the interface compatilizer between carbon black and SBR. The effect of TMBP on the dispersion degree of carbon black in SBR was investigated and compared with that of a bis-phenol A epoxy resin(E-51) and DOP by a series experiments such as tension properties, bound rubber content, dynamic properties, SEM and rheological properties. The results showed that the dispersion degree of carbon black was the best in the vulcanizates with 6 phr TMBP. TMBP acted as a typical compatilizer.

研究简报

High-yield Preparation of Polymeric Micelles with Carboxyl Groups in the Core

WANG Hui, CHEN Dao-Yong, JIANG Ming


2006, 27(10):  1996-1998.  doi:

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Polymeric micelles with carboxyl groups in the core(PMCC) were prepared by chemical cross-linking induced micellization of chlorinated polystyrene-b-poly(acrylic acid)(PS-b-PAA) by glycol in dichloromethane. The crosslinking of chlorinated PAA blocks results in the formation of micelle core, whereas PS block chains form the micelle shell. The chlorination of PAA produces anhydride groups, which make carboxyl groups during the crosslinking reaction with glycols, hence the resultant micelles contain carboxyl groups in the core. As the concentration of polymers can be as high as 50 g/mL, therefore, PMCC can be prepared with a high efficiency, and the powder micelle product was obtained by direct precipitation in methanol-water mixture. The PMCC were characterized by means of FTIR, ¹H NMR, DLS and SEM.

Synthesis and Characterization of a Novel Azo Compound with ‘Dumbbell Shape’

MAO Hua-Ping¹, YU You-Hai¹, CHEN Liang¹, LU Xiao-Feng¹, ZHANG Wan-Jin¹, ZHANG Hong-Xing²

2006, 27(10):  1999-2001.  doi:

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A novel azo compound with ‘dumbbell shape’ was synthesized successfully and characterized by MALDI-MS, FTIR, elemental analysis, ¹H NMR and ¹³C NMR. UV-Vis spectrum was used to monitor the trans-cis isomerization and theoretical calculations were used to modelize the trans and cis isomers. The trans and cis isomers of the ‘dumbbell shape’ azo compound are both stable at room temperature because of the large end group.

Preparation and Characterization of Poly(vinyl pyrrolidone)/Fe₃O₄ Composite Nanofibers

LI Xiang, ZHAO Yi-Yang, LU Xiao-Feng, WANG Hai-Ying, WANG Ce

2006, 27(10):  2002-2004.  doi:

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Poly(vinyl pyrrolidone)(PVP)/Fe₃O₄ composite nanofibers were successfully prepared by using electrospinning technique. The composite nanofibers were characterized by means of TEM(transmission electron microscopy), XRD(X-ray diffraction) and TGA(thermogravimetric analysis). Transmission electron microscope images of the PVP/Fe₃O₄ nanofibers show that the Fe₃O₄ nanoparticles with a diameter about 10.5 nm were dispersed in PVP fiber matrices. The XRD results show that the particles in PVP fibers were indeed Fe₃O₄ nanoparticles. And the TGA of PVP/Fe₃O₄ nanofibers show that the content of Fe₃O₄ nanoparticles in the composite was about 36.8%(mass fraction). The PVP/Fe₃O₄ nanofibers were found to be superparamagnetic. The hysteresis loop at room temperature showed a high saturated magnetization(M_s=15.1 emu/g) and a low coercive force(μ_c=0).