Table of Content

10 February 2007, Volume 28 Issue 2

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高等学校化学学报2007年第28卷第2期目次

2007, 28(2):  0.  doi:

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研究论文

Defective LB Films Induced by Potassium Oxalate and Its Effect on Deposited Patterns of Calcium Oxalate

DENG Sui-Ping, ZHANG Sheng, OUYANG Jian-Ming, CAI Ji-Ye

2007, 28(2):  199-203.  doi:

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The defective Langmuir-Blodgett(LB) film of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine(DPPC) induced by potassium oxalate(K₂C₂O₄) and its effect on nucleation and growth of calcium oxalate monohydrate(COM) were investigated with the aid of atomic force microscopy(AFM) and scanning electron microscopy(SEM). K₂C₂O₄ can destruct the molecules arrangement in the circular domains in LB film especially at the boundaries of liquid condensed(LC) and liquid expanded(LE) phases, which provides much more nucleating sites for COM crystals and promotes the nucleation and growth of COM crystals. It results in the formation of circular COM crystals patterns. As the concentration of potassium oxalate increases from 0.3 mmol/L to 5.0 mmol/L, the patterns of the COM crystals change from a solid circle to a ring-shape, the number of patterns increases and the average diameter of the patterns decreases. The results would shed light on the molecular mechanism of structure change in renal epitheial membrane injured by oxalate at the molecular and supramolecular level, and on the relationship between urolithiasis and the injury of renal epitheial membrane.

Preparation of Three-dimensionally Ordered Macroporous Spinel LiMn₂O₄ by Colloidal Crystal Template and Its Characterization

SONG Chun-Xia, YANG Li-Xin, CHEN Xiao-Ming, WU Shu-Ying, WANG Xian-You

2007, 28(2):  204-207.  doi:

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The colloidal crystal template was prepared by the centrifugal settling of microspheres, whose particle diameters were about 280 nm, from the mother liquor of polymethyl methacrylate(PMMA) obtained by emulsion polymerization. The ethanol-water solution of precursor was formulated with LiNO₃, Mn(Ac)₂·4H₂O, and citric acid in the molar ratio of 1∶2∶2 and was filled into the interstices of PMMA colloidal crystal template. The lithium manganese oxide of three-dimensional ordered macropore(3DOM) was prepared with their composite being dried and roasted in air to form holes. The experiments indicate that the formation of objective product is facilitated when n(Li)/n(Mn)=0.6, the concentration of the precursor was in the range of 0.6—1.0 mol/L, and the roasting temperatures in the two isothermal sections were 300 ℃ and 600 ℃ for 2—3 h separately, and the heating rate was 2 ℃/min. SEM images show that the PMMA colloidal crystal template as well as the 3DOM lithium manganese oxide was arrayed periodically in face-centered cubic closed packing. The macropore diameters were between 200—240 nm, and the pore wall thicknesses between 30—45 nm. Through XRD determination of the crystal phase and the titration analyses of EDTA and KMnO₄, the final product was proved conclusively to be normal spinel LiMn₂O₄.

Formation and Stabilization of Selenium Nano-particles in Aqueous Solution of Undaria Pinnatifida Charv. Suringer Polysaccharide

ZHENG Wen-Jie^1,2, HUANG Liang¹, YANG Fang^1,2, BAI Yan¹

2007, 28(2):  208-211.  doi:

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In aqueous solution of degraded undaria pinnatifida charv. suringer polysaccharide(DUP), excessive L-ascorbic acid(Vc) reacted with selenium dioxide(SeO₂) to form selenium nano-particles(Se⁰) at room temperature. It was characterized by transmission electron microscope(TEM), laser light scattering image and Resonance Rayleigh Scattering(RRS) to study the function of DUP in the modulation and stabilization of selenium nano-particles. The results show that DUP can modulate the reaction rate, modify the surface of selenium particles and control the diameter of selenium particles. When the concentration of Se⁰ was 0.0507 to 3.245 mmol/L, the average diameter of selenium particles modified by DUP was 24 to 64 nm, and the selenium particles were sphere. The nanometer Se⁰ sol-gel can be preserved for more than a month in aqueous solution of DUP at 4 ℃.

Divalent Metal Ion-activated DNA Cleavage Activity of Copper Superoxide Dismutase

ZHOU Ruo-Yu¹, HAN Ying-Chun¹, JIANG Wei¹, YANG Hao¹, LIU Chang-Lin²

2007, 28(2):  212-216.  doi:

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The study examined the DNA cleavage activity mediated by each member of the Cu²⁺-containing forms of CuZnSOD(Cu_nSOD, n=1—4) in the presence of exogenous Mg²⁺ or Mn²⁺. The result indicates that upon addition of Mg²⁺ or Mn²⁺, Cu_nSOD can more efficiently cleave DNA via a hydrolytic pathway compared with its holo- and apo-forms. The factors, such as exogenous divalent metal concentration, pH and enzyme concentration, can affect the DNA cleavage activity. We also measured the relative enzyme activity and the steady state kinetic parameters of the DNA cleavage reaction, indicating that the DNA cleavage activity is independent of Cu²⁺ number in Cu_nSOD, and increased in an order of Cu₁SOD2SOD≈Cu₄SOD3SOD.

Synthesis of Zinc Blende CdS Nanocrystallites Using 3-Mercaptopropionic Acid as Precursor by Hydrothermal Method

XU Rong-Hui^1,2, WANG Yong-Xian¹, JIA Guang-Qiang³, XU Wan-Bang^1,2, YIN Duan-Zhi¹

2007, 28(2):  217-219.  doi:

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Zinc blende CdS nanocrystals with a size about 5 nm were synthesized using 3-mercaptopropionic acid and cadmium acetate as precursor directly via hydrothermal synthesis method. Narrow size-distribution nanocrystals were produced by controlling some main affecting factors. The nanocrystals emit highly symmetric fluorescence. X-ray diffraction, transmission electron microscopy, high resolution electron microscopy, and fluorescence excitation and emission spectroscopy were used to characterize the chemical composition, size, shape, structure and photophysical property of the product. The zinc blende CdS might be of potential value in bio-imaging area.

Synthesis and Electrical Properties of New Solid State Electrolyte Materials Ce_5.2RE_0.8MoO_15-δ

ZHOU De-Feng^1,2, GUO Wei²,GE Zhi-Min², HAO Xian-Feng¹, CAI Ping¹,
CAO Xue-Qiang¹,XING Xian-Yan³, MENG Jian¹

2007, 28(2):  220-223.  doi:

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A series of solid state electrolytes, Ce_5.2RE_0.8MoO_15-δ(RE=Y, La, Sm, Gd, Dy, Ho, Er), were synthesized by sol-gel method. Their structures and electrical conductivities were characterized by X-ray Diffraction(XRD), Raman and X-ray Photoelectron Spectroscopy(XPS) and AC impedance spectroscopy, respectively. The results show that the concentrations of oxygen vacancy increased with increasing x and their conductivity were improved. And the cell parameters increase as the radius of RE³⁺ increases. Because the ionic radius of doped Dy³⁺(0.0908 nm) is closed to that of Ce⁴⁺(0.0920 nm), their oxide has minimal cell elastic straining between RE³⁺and oxygen vacancy, and the system has the least association enthalpy, thus the oxide Ce_5.2RE_0.8MoO_15-δ exhibits a higher conductivity(7.02×10^-3 S/cm) and lower activation energy(1.056 eV) compared to the other doped compounds.

研究简报

Influence of Lithium Salts Anion and Sidegroup of 15-Crown-5 Series on the Far IR Shift of Solid Lithium Complexes with Crown Ethers

WEN Yong-Hong¹, YANG En-Bo², FU Li-An¹, FANG Sheng-Qiang¹

2007, 28(2):  224-226.  doi:

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Two reduced sequences of (s/s')f (relative reduced partition function ratio) found in the present paper are LiSCN·B15C5＞LiCCl₃COO·B15C5 ＞ LiClO₄·B15C5 and LiClO₄·4-mB15C5＞LiClO₄·B15C5＞LiClO₄·Ph15C5, respectively. These solid lithium complexes with crown ethers were separated from tetrahydrofuran for the first sequence and from 3-methyl-1-butanol for the second one, respectively. Acording to the analysis of the data obtained, an independent character of the three factors(solvents, anion of lithium salts, and the sidegroup of 15C5 series ), playing a part in contribution to (s/s')f, have been brought to light preliminarily.

研究论文

Studies on Interaction of Bovine Serum Albumin with Indo-1 by Fluorescence Spectroscopic Method

BAI Hai-Xin^1,2, YANG Cheng₁, YANG Xiu-Rong1

2007, 28(2):  227-233.  doi:

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The binding-site number was calculated by using fluorescence spectroscopic method with bovine serum albumin(BSA) and Indo-1 as protein and ligand models, respectively. The method for calculating binding-site number in BSA for Indo-1 was developed based on the relationships between the changes of Indo-1 fluorescence intensity and the analytical concentration of BSA. And the interaction of BSA with Indo-1 was investigated comprehensively by using fluorescence techniques as well as fluorescence resonance energy transfer, and the thermodynamic parameters were calculated according to the changes of enthalpy on temperature. Three binding sites in BSA for Indo-1 were revealed, and the distances from Trp212 in BSA to the three binding sites were 2.93, 2.57 and 2.40 nm, respectively. It was also proved that Indo-1 embedded into the three hydrophobic cavities of BSA by hydrophobic association. This paper provided a use for reference on calculating the binding-site number in protein for ligand and studying their interactions by fluorescence spectroscopic methods. In fluorescent quenching experiments, fluorescence changes were automatically recorded in real time by combining Microlab 500 Series Dispenser and PTI fluorescence apparatus.

Application of Capillary Electrophoresis to ScreeningNatural Products Using Thrombin as Target

LING Xiao-Mei¹, LIU Yi¹, LAI Xian-Yin², ZHANG Yuan², LIU Xiao-Ming², TU Peng-Fei², ZHAO Yu-Ying^2,3, CUI Jing-Rong³

2007, 28(2):  234-237.  doi:

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In this article, the interactions between hirudin and thrombin, and that between heparin and thrombin were investigated by using capillary electrophoresis. The binding constant between hirudin and thrombin was calculated to be 7.85×10⁵ L/mol. A capillary zone electrophoretic method was applied to determine the interactions between natural products and thrombin. The samples containing the natural extractions and thrombin at various ratios were incubated at 25 ℃ and then were separated by CZE with Tris-acetate buffer at pH=7.2. Each run could be accomplished within 10 min. The experimental results show that the reported method by capillary zone electrophoresis for the determination of the interactions between natural products and thrombin is powerful, sensitive and fast, requires less amounts of reagents, and further, it can be employed as a reliable alternative to other methods.

Mini Microwave Resonance Cavity Used for Microwave-accelerated Protein-enzymolysis in Protein Mapping by Mass Spectrometry

DOU Wen-Chao, HUAN Yan-Fu, ZHANG Zhi-Quan, ZHANG Hua-Rong, WANG Chao, LI Ming, FENG Guo-Dong, JIN Qin-Han

2007, 28(2):  238-241.  doi:

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A mini microwave resonance cavity was used to accelerate proteolytic cleavage of cytochrome c and bovine serum albumin. The resulting mixture were then analyzed by electrospray ionization mass spectrometer(ESI-MS).The digestion efficiencies of proteins was 100%,the sequence coverages of cytochrome c and bovine serum albumin were 45% and 26%, respectively. This approach not only speeds up the digestion process to 20 minutes versus 16 h by using traditional methods, but also reduced the power of microwave to 20 W versus hundreds Watt by using other microwave-assisted enzymatic digest methods.

Chemiluminescent Enzyme Immunoassay for Cardiac Troponin I Detection——Optimization of Experimental Parameters

HE Nong-Yue¹, GUO Hui-Shi¹, GU Chun-Rong², YANG Di², ZHANG JI-Nan²

2007, 28(2):  242-245.  doi:

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Chemiluminescent immunoassays(CLIA) were intensively studied in antigen/antibody detection, due to the extremely sensitive chemiluminescent detection techniques. Here we present a sensitive immuno-assay for cTnI based on this concept. The assay was executed as the traditional ELISA except that two major modifications were made to obtain a rapid test and a high sensitivity. The first modification is that the two-step dual monoclonal antibody “sandwich” principle of traditional ELISA was substituted by a one-step immuno-reaction mode which decreased the turnaround time greatly. The second modification is that a chemiluminescent substrate(AMPPD) and chemiluminescent detection techniques, which elevated the sensitivity remar-kably, were used to replace the colorimetric substrate and colorimetric detection method in ELISA. The detection procedure of the assay could be fulfilled within 75 min. A linear range between the luminescent signal current and the concentration of cTnI from 0.04 to 36.2 ng/mL and a detection limit of 0.02 ng/mL were obtained. The established method was tested by determining cTnI in real samples by using ELISA for comparison analysis, and good results were obtained.

Partial Least Squares Regression Method Based on Consensus Modeling for Quantitative Analysis of Near-Infrared Spectra

LI Yan-Kun, SHAO Xue-Guang, 蔡文生

2007, 28(2):  246-249.  doi:

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Consensus modeling averages the results of multiple independent models to obtain a single prediction, which avoids the instability of a single model. Based on the philosophy of consensus modeling, a consensus partial least squares regression(cPLS) method was proposed and applied to building the quantitative model of NIR spectra of tobacco samples. Through an investigation of the parameters involved in the modeling, a satisfied model was achieved for predicting the content of chlorine in tobacco samples. With repeated independent runs, cPLS model was found to be more robust and credible than PLS model. Furthermore, compared with PLS method, cPLS model gives more stable and accurate prediction results.

Difference Analysis of Mass Spectra and Its Application to Research of Chinese Multiherb Remedy

RAN Xiao-Rong¹, YANG Hui-Hua¹, LIANG Qiong-Lin¹, CHEN Jun¹, WANG Yi-Ming¹, LUO Guo-An¹, LI Ping², LI Ke-Ming², CHEN Yu-Wu²

2007, 28(2):  250-253.  doi:

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The constituents in effective groups of Chinese multiherb remedy possess the similar chemical and structural characters, and the same neutral loss under collisional induced dissociation(CID). Based on this, the fingerprints of the multiherb remedy and the effective extracts were established by using HPLC-ESI-MSⁿ in this paper, the information of retention time, molecular weights and the fragment information was compared to confirm the attribution of effective constituents to the peaks in the fingerprint of Chinese multiherb remedy, then, the difference analysis of mass spectra was employed to deal with the fragment data for rapidly identifying the effective constituents according to the neutral loss. Taking Chinese multiherb remedy Chailin-tang for example, its effective fractions flavonoids in Radix Scutellariae and Saikosaponins in Radix bupleuriand were studied.

Fluorescence Resonance Energy Transfer Between CdTe Quantum Dot Donors and Au Nanoparticles Labeled DNA Acceptors

ZHANG Ji-Mei¹, DAI Zhao¹, GUO Ning¹, XU Shi-Chao¹, DONG Quan-Xi¹, SUN Bo²

2007, 28(2):  254-257.  doi:

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CdTe semiconductor nanoparticles which were synthesized in water phase were taken as the energy donors. CdTe nanoparticles were linked to 5'-NH₂-DNA by Schiff's reaction. Au nanoparticles which were prepared by sodium citrate reduction of chloroauric acids were taken as the energy acceptors. Au nanoparticles were linked to 3'-SH—DNA by Au—S bond. The fluoresscence resonance energy transfer(FRET) probes are generated through hybridization of complementary DNA bound to the QDs and Au nanoparticles. The fluorescence spectra of CdTe-DNA, CdTe-DNA-Au and CdTe-DNA-Au+target DNA were measured . The data show that the fluorescence intensity of CdTe-DNA-Au conjugates was the weakest. When adding a complementary ssDNA to CdTe-DNA-Au conjugates, the fluorescence intensity of the system increased. This result shows that the configuration of FRET was successful.

研究简报

Enantiomeric Resolution of Tebuconazole on Immobilized Cellulose Chiral Stationary Phase

MING Yong-Fei^1,2, ZHAO Liang¹, ZHANG Hong-Li¹, SHI Yan-Ping¹, LI Yong-Min¹

2007, 28(2):  258-260.  doi:

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The chiral stationary pahse of 3,5-dimethylphenylcarbamates of cellulose chemically bonded to 3-aminopropyl silica gel at the 6-position of the glucose units was prepared. The racemates of tebuconazole were resolved on the new immobilized chiral stationary phase, and the influences of modifiers(alcohols, THF and chloroform) in the mobile phase on the resolution were investigated. The chromatographic conditions were optimized. The results show that the new immobilized chiral stationary phase exhibits a good stereoselectivity to tebuconzole. The best resolution of 1.51 of tebuconazole was obtained by using hexane/2-propanol/ THF(volume ratio 90:5:5) as the mobile phase on a 150 mm column.

研究论文

Effects of DMF on Competitive Inhibition of Lipoxygenase and Relaxation of Substrate Inhibition in Aerobic Catalysis of Lipoxygenase

XIA Yong-Mei, SU Ya-Fen, CAI Yan, FANG Yun

2007, 28(2):  261-264.  doi:

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The substrate inhibition was observed in the hydroperoxidation of linoleic acid catalyzed by soybean lipoxygenase at substrate concentrations higher than 0.075 mmol/L. Addition of DMF(lgP=1.01) could raise the substrate level to 232 mmol/L, and increase the hydroperoxide(HPOD) yield from 38.93% to 66.09%. The results of lyophilization test show that DMF mixed with substrate didn't influence on the enzymatic activity evidently although DMF made the enzymatic activity declined obviously in the absence of substrate. For lipoxygenase DMF served as either an activator at lower level or an inhibitor at higher level, which was illustrated by the activation constant K_a, the inhibition constant K_i and the effect of DMF with substrate on enzymatic activity. The substrate inhibition constant K_ss at higher DMF level increased by 1000—5600 folds, which implied that the interaction between relaxation of substrate inhibition and competitive inhibition of lipoxygenase resulted from DMF made the excess substrate inhibition greatly released. The maximum K_ss and K_i obtained at 5% DMF means that the maximum relaxation of substrate inhibition and the minimum competitive inhibition to lipoxygenase appeared simultaneously.

Chemical Synthesis of N-Acetylchitooligosaccharide Analogues

YAO Yan-Ping^1,2, ZHU Zhen-Yuan², XU Tong¹, ZHANG Yong-Min^2,3

2007, 28(2):  265-269.  doi:

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It has been reported that N-acetylchitooligosaccharides can act as the chemical signals in the plant induced resistance. In order to study the mechanisms and search new compounds with a high biological activity, utilizing N-phthalic acyle group as the protective group of amine, and thioethyl as the leaving group at the reducing terminal, two novel N-acetylchitooligosaccharide analogues, β-1,3-N-acetamido-gluco-disaccharide and β-1,3-N-acetamido-gluco-trisaccharide, were designed and synthesized by amino glucose as the starting material. All synthesized compounds were characterized by ¹H NMR, ¹³C NMR and HRMS. Being different with the natural N-acetylchitooligosaccharides, the two synthesized analogues have a backbone of 1→3 linked structure, and they can be applied to study of the relationship between the induced resistance of plants to diseases by N-acetylchitooligosaccharides and the backbone structures.

Synthesis and Biological Activity of Novel Imine Derivatives Containing Triazole and Thiazole Ring

SHAO Ling, ZHANG Qing, ZHOU Xin, JIN Zhong, LIU Jian-Bing, FANG Jian-Xin

2007, 28(2):  270-273.  doi:

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In search of low toxicity and potent fungicide, 18 novel imine derivatives containing thiazole and trizole ring were synthesized. N-Substituted benzylidene-4-(4-chlorophenyl)-5-(1H-1,2,4-triazol-1-yl)thiazol-2-amine were synthesized from the reaction of 4-(4-chlorophenyl)-5-(1H-1,2,4-triazol-1-yl)thiazol-2-yl-amine and substituted benzaldehyde. The structures of the target compounds were confirmed by elemental analysis, ¹H NMR and X-ray diffraction. The bioassay results display that some of the title compounds(6b, 6d, 6g, 6j, 6k) possess a fungicidal activity against P. piricola on test concentration(50 mg/L).

Preliminary Study on Hippocampal Proteomics of Senescence-accelerated Mouse

DONG Lei¹, JIANG Ning¹, ZHOU Wen-Xia¹, ZHANG Yong-Xiang1, GENG Miao¹, ZHANG Xue-Min², LIU Bing-Yu², WANG Jie²

2007, 28(2):  274-277.  doi:

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To investigate mechanisms of the deficits of learning and memory related with aging, the differentially expressed hippocampal proteins from 6- and 12-month-old SAM-prone/8(SAMP8)and age-matched SAM-resistance/1(SAMR1)were analyzed and compared. In comparison with the same age SAMR1, 15 proteins expressions in hippocampus of 6-month-old SAMP8 increased, 5 proteins expressions decreased significantly; 12 proteins expressions in hippocampus of 12-month-old SAMP8 increased, 2 proteins expressions decreased significantly and 2 proteins only expressed in SAMP8 hippocampus; and 22 proteins with significant changes were identified by MALDI-TOF-MS and the results were searched in MASCOT database. These identified proteins could be devided into four categories according to their functions: (1) energy metabolism; (2) mitochondrion function; (3) signal transduction; (4) other proteins. The results show that there were significant differences in hippocampus protein expressions between SAMP8 and SAMR1, and some differentially expressed proteins were correlated with the deficits of learning and memory in SAMP8 with aging, and these proteins could provide clues for the study and discovery of new protein targets for improving intelligence drugs.

Molecular Dynamics Simulation of Conformational Conversion Between Crystal Conformation and Active Conformation of Herbicidal Monosulfuron

CHEN Pei-Quan^1,2,4, SUN Hong-Wei^3,4, LI Zheng-Ming^1,2,4, WANG Jian-Guo^1,2,
MA Yi^1,2, LAI Cheng-Ming^2,3

2007, 28(2):  278-282.  doi:

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Molecular conformation plays an essential role in the activity of monosulfuron. To understand the conformational conversion, especially how to convert to an active conformation, herein, the conformational behavior in water, n-octanol and n-octane solutions, the interaction energies with these three different solvents and hydrogen bond interaction with solvents of monosulfuron were investigated by a series of molecular dyna-mics simulations. The simulation results indicate that dominative conformations were different in different solvents, and the conformational conversion, especially converting to an active conformation, was mainly occurs in the aqueous solution in the plant. The calculation results also implies that the interaction between the monosulfuron and solvents was main factor which determined the conformational behavior of monosulfuron. The NH group in the sulfonylurea bridge may interact with the solution which has hydrogen bond acceptor atoms through hydrogen bond, and the competition between forming internal N—H…N hydrogen bond and forming hydrogen bond with solution was probably the driven force from crystal conformation to active conformation conversion.

研究简报

Enzymatic Synthesis and Identification of Maltosyl(α-1→6)β-cyclodextrin

CUI Bo^1,2, JIN Zheng-Yu¹

2007, 28(2):  283-285.  doi:

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Cyclodextrins are widely used for various purposes and limited because of it's low solubility. Branched cyclodextrins have attracted more and more attention because of their many advantages such as higher solubility in water. In this study a new method for synthesizing maltosyl(α-1→6)β-cyclodextrin with a high yield was described. Mal-β-CD was synthesized through the reverse reaction of Bacillus licheniformis pullulanase and identified. The factors which affect the formation of maltosyl(α-1→6)β-cyclodextrin were studied and the optimum conditions were obtained as follows: 250 U/g β-CD of enzyme amount, molar ratio of maltose to β-CD 12:1—16:1, a substrate mass fraction of 80%, the pH of reaction mixture 4.5 , reaction temperature 70 ℃ and reaction time 60 h respectively. The product was separated by Sephadex G25 column and further purified by Bio-gel P-2 column. Maltosyl(α-1→6)β-cyclodextrin was identified by IR, ESI-MS and NMR. It was proved to be a effective method to synthesize maltosyl(α-1→6)β-cyclodextrin by using Bacillus licheniformis pullulanase. The yield of Mal-β-CD was about 56% under the optimal conditions.

Separation and Identification of New Furosteroidal Saponin from Ophiopogon japonicus(Thunb.) Ker-Gawl

XU Tun-Hai¹, CHEN Ping², XU Ya-Juan², HAO Ling-Zhu², XIE Sheng-Xu², XU Dong-Ming²

2007, 28(2):  286-288.  doi:

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Traditional Chinese Medicine “maidong”[Ophiopogon japonicus(Thunb.) Ker-Gawl] is the important medicine used to treat cardiovascular diseases. A new furosteroidal saponin, together with three known steroidal saponins, was isolated from the tuber of Ophiopogon japonicus(Thunb.) Ker-Gawl. The structure of the new furosteroidal saponin, named Ophiopogoside A, was elucidated as 26-O-β-D-glucopyranosyl-(25S)-1β,3β,22α,26-tetrahydroxyfurot-5-ene 3-O-[-α-L-arabinopyranosyl(1→3)]-α-L-rhamnopyranosyl(1→2)-β-D-fucopyranoside mainly by using 1D, 2D NMR techniques, ESI-MS analysis as well as chemical methods.

Kinetics and Thermodynamics of Adsorption of Phenolonto Mesoporous Carbon CMK-3

GUO Zhuo¹, YUAN Yue²

2007, 28(2):  289-292.  doi:

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Mesoporous carbon CMK-3 was used to adsorb phenol from water by comparing its adsorption ability with commercial spherical activated carbon(CAC). CMK-3 had a higher adsorption capacity and faster adsorption rate than CAC. The adsorption property of phenol onto the mesoporous carbon CMK-3 was discussed from the thermodynamic and kinetic viewpoints. The adsorption parameters for Langmuir and Freundlich isotherm models were determined for CMK-3. Both isotherms were suitable models to analyze the equilibrium data for the phenol adsorption. However, the Freundlich model fitted better than the Langmuir model. The adsorption kinetics was tested with the pseudo-first-order and pseudo-second-order reaction mode1. The rate constants of adsorption for these kinetics models were calculated. The pseudo-second-order kinetic model provided the best correlation of the experimental data compared to the pseudo-first-order model. The thermodynamic constants of the adsorption process ΔG⁰, ΔS⁰ and ΔH⁰ were evaluated. These show that adsorption of phenol on CMK-3 was endothermic and spontaneous.

研究论文

Electrochemical Behavior of Butylene Sulfite as Novel Film-forming Electrolyte Additive for Lithium Ion Batteries

LI Li^1,3, WU Feng^1,3, CHEN Ren-Jie^2,3, WU Sheng-Xian¹

2007, 28(2):  293-296.  doi:

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As a novel organic solvent electrolyte material, sulfites possess high a antioxidation and electrochemical stability. Butylene sulfite with cyclic structure was synthesized. The total energy and the frontier molecular orbital energy of the organic butylene sulfite and propylene carbonate molecules were calculated. The LUMO energy and the total energy of the propylene carbonate molecule were lower than that of the butylene sulfite molecule. It is clearly indicated that the butylene sulfite molecule can easily accept electrons and bears a high reaction activity. Even in additive amounts(volume fraction 5%) butylene sulfite is suppressing co-intercalation of propylene carbonate(PC) into graphite. The formation of a stable passivating film on the graphite surface was believed to be the reason for the improved cycle performance for lithium ion battery.

Carbon Deposition Behavior over Copper Salts of Molybdovanadophosphoric Acid Catalyst Supported by Magnesia

ZHOU Guang-Dong^1,2, HAN Yang¹, LIU Jie¹, LI Li-Min³, ZHEN Kai-Ji¹, WANG Hai-Shui², CHENG Tie-Xin¹

2007, 28(2):  297-301.  doi:

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MgO supported copper salt of molybdovanadophosphoric acid H₄PMo₁₁VO₄₀ catalysts were prepared in alcohol by impregnation and the carbon deposition over these catalysts during the n-hexanol oxidation reaction was studied. The coke predominantly deposited on the catalyst surface in the form of CH_x, and it was not found that it caused the deactivation of the catalyst. The XRD, IR, XPS characterizations reveal that the Keggin structure of the CPMV was unaffected by carbon deposition. Moreover, it was shown that the supported CPMVs over the MgO surface can be beneficial to eliminate the coke. The temperature programmed oxidation(TPO) study showed that coke was formed over the catalyst on two different sites: (1) deposited on the CPMVs which can be burn off at a low temperature; (2) deposited on the MgO which could only be removed at higher temperature. The coke content reached constant with the reaction time increasing.

Structure and Performance of LiFePO₄/CaB₆ Composites

LIU Shan-Ke¹, DONG Quan-Feng^1,2, ZHENG Ming-Shen¹, JIN Ming-Gang², ZHAN Ya-Ding^1,2, LIN Zu-Geng^1,2, SUN Shi-Gang¹

2007, 28(2):  302-306.  doi:

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In order to improve the electric conductivity and tap density of lithium iron phosphate, CaB₆ was used as a new additive for the first time. LiFePO₄ was synthesized by solid sate reaction and LiFePO₄/CaB₆ composite with different contents of CaB₆ was prepared by two different methods. The samples were characterized by granularity, morphology, electric conductivity, tap density, X-ray diffraction and charge-discharge performance. The results show that although the specific capacity of these materials doped with CaB₆ was not improved significantly, the tap density and electronic conductivity of these composites increased. The samples synthesized by the second method exhibit much better performance, and the electronic conductivity of the materials is enhanced by five orders of magnitude and the tap density by 65%.

Cooperative Effect of Hydrogen Bonds Between Side Chains on Self-assembly of D,L-α Cyclic Peptide Nanotube

QU Wen-Wen, TAN Hong-Wei, LIU Ruo-Zhuang, CHEN Guang-Ju

2007, 28(2):  307-311.  doi:

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A series of parallel and antiparallel oligomers of cyclo[-(L-Asn-Ala)₄-], cyclo[-(L-Asp-Ala)₄-], cyclo[-(L-Gln-Ala)₄-] and [-(L-Glu-Ala)₄-] were investigated by using density functional me-thods B3LYP and semiempirical molecular orbital method AM1. The results of this study indicate that when these cyclic peptides self-assemble as either parallel or antiparallel stacking modes, hydrogen bonds could be formed between side chains of Asn, Asp, Gln and Glu. Significantly, the interactions between side-chain hydrogen bonds result in the cooperative effect of the assembly energetics, which facilitates the cyclic peptides to form stable nanotubes and have the most dominant effect on determining the preference for parallel vs. antiparallel stacking.

Synthesis of ZnO Nanorods by a Direct Precipitation Method at Room Temperature

YE Hong-Yong¹, LAI Hong-Wei¹, WU Shu-Jie¹, CUI Xiang-Hao¹, KAN Qiu-Bin¹, Jeong-Kun Yoo²

2007, 28(2):  312-315.  doi:

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Zinc oxide(ZnO) nanorods were successfully synthesized by a simple approach via a direct precipitation method in the presence of PEG-400(polyethylene glycol 400) at room temperature. The characterizations of ZnO nanorods were carried out by XRD, TEM, SAED and HRTEM. The results show that the as-prepared ZnO crystals are one-dimensional nanorsds which are single crystals with a hexagonal wurtzite structure. The ZnO nanorods are uniform with 20—40 nm diameter and lengths ranging from 300 to 800 nm. The (0001) face is the growth direction of the ZnO nanorods. The possible mechanism of the growth of ZnO crystal and the form of ZnO nanorods along with the important effect of PEG-400 on the fabrication of ZnO nanorods were discussed.

Effects of Block Copolymer Chain Length and Surface Adsorption Intensity on Microphase Separation Under Three-dimensional Confinement

CHEN Li-Jun, ZHANG Zhi-Jie, L 2007, 28(2):  316-319.  doi:

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The microphase separation of symmetric diblock copolymer under three-dimensional confinement was studied with dynamic density functional theory(DDFT). The confinement structure is randomly distributed microspheres in space with maximum volume fraction of 0.6. The effects by varying the block copolymer chain length and the microsphere size on the microphase morphologies were discussed. Moreover, the preferentially attractive interaction between block A and the microsphere surface was considered, which takes great effects on the microphase orientation under the confinement.

Theoretical Study on Intermolecular Interactions BetweenHCN(HNC) and NH₃, H₂O, HF

WANG Zhao-Xu, ZHANG Jing-Chang, CAO Wei-liang

2007, 28(2):  320-324.  doi:

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Ab initio molecular orbital calculations including MP2 correlation energy was employed to optimize the geometries of the hydrogen-bonded complexes formed by HCN(HNC) with NH₃, H₂O and HF, respectively at aug-cc-pVTZ level. It was found that there were two kinds of stable complexes bonded by intermolecular hydrogen bonds: HCN(HNC) as the proton donor and as the proton acceptor. The effect of basis set superposition error on the total interaction energy is smaller than 3.34 kJ/mol. Natural bond orbital (NBO) analysis was performed to analyze the atomic charges and charges transfer in the monomers and complexes. The results of the decomposition of interaction energy according to SAPT2 show that the electrostatic and induction forces dominate the intermolecular interaction, and there is a good correlation between induction forces and charges transfer.

Structure on Surface and the Bulk Shell of Nanosized PrO_y-ZrO₂ Solid Solution Prepared by Sol-gel Method

YING Yue-Fang, LUO Meng-Fei, WANG Yue-Juan, XIE Guan-Qun, WANG Xue-Qin, HE Mai, WANG Xue-Li

2007, 28(2):  325-329.  doi:

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The characterization for PrO_y-ZrO₂ solid solutions prepared by improved sol-gel method was performed by means of Raman, XRD, TEM and so on. It is found that the grain size of PrO_y-ZrO₂ solid solution calcined at 650 ℃ is 5—10 nm, and that of PrO_y-ZrO₂ solid solution calcined at 950 ℃[x(Pr)>16%] is about 20 nm. At a higher Pr content, phase transformation towords a higher-symmetrical phase(tetragonal or cubic) was observed. The results of phase analysis obtained by Raman spectroscopy were different from the corresponding results of XRD, which implies a structure difference between the surface and the bulk shell of the samples. With the increase of the Pr content, the m→t→c phase tramsformation occurred in the bulk area and the m→t→t" phase tramsformation occurred in the surface area. The surface region is more easily to form a low symmetry and disorder structure.

Ab initio Studies on Spectroscopic Properties of Au(Ⅰ) Charge-transfer Complexes

PAN Qing-Jiang¹, ZHOU Xin², ZHANG Hong-Xing², FU Hong-Gang¹

2007, 28(2):  330-333.  doi:

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The process of charge separation of transition metal charge-transfer complexes involves the conversion of photo-energy into electrical energy, closely related to their electronic structures. We explored thecharge-transfer properties of binuclear Au(Ⅰ) complexes, cis-[Au₂(SHCH₂PH₂)₂]²⁺(1), cis-[Au₂(SHCH₂S)₂](2) and cis-[Au₂(PH₂CH₂S)₂](3), using ab initio methods. Their Au(Ⅰ)—Au(Ⅰ) distances in the ground states at the MP2 level are 0.2972, 0.2888 and 0.2903 nm, respectively, indicating the weak attraction between the two Au atoms. Upon excitation, those of complexes 2 and 3 are shortened by ca. 0.016 nm whereas that of complex 1 only elongates ca. 0.002 nm. CIS calculations predict that the triplet excited states of complexes 1—3 give rise to 383, 463 and 422 nm lowest-energy emissions, respectively. These emissions are attributable to the metal-centered(MC) transition mixed with the intramolecular charge transfer(ICT), which significantly differs from the cases in the previous studied on [Au₂(SHCH₂SH)₂]²⁺, trans-[Au₂(SHCH₂PH₂)₂]²⁺ and [Au₂(PH₂CH₂PH₂)₂]²⁺.

Selective Oxidation of Isobutane over Hydrothermally Synthesised Mo-V-Te-Nb-O Mixed Oxide Catalyst

ZHU Wan-Chun, JIA Ming-Jun , WANG Zhen-Lü, WANG Guo-Jia, WU Tong-Hao

2007, 28(2):  334-337.  doi:

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Various Mo-V-Nb-Te-O mixed oxide catalysts were prepared by hydrothermal synthesis and characterized by means of XRD, ICP, BET and SEM. The catalysts were tested in the selective oxidation of isobutane to methylacrolein(MAL) and methacrylic acid(MAA). The effects of elemental composition of the catalyst, reaction temperature and GHSV on the catalytic performance were investigated. The results indicate that the composition and crystal phase of the catalysts significantly affected the catalytic properties. Under the optimum reaction conditions(673 K, GHSV=3600 h^-1), MoV_0.3Te_0.17Nb_0.12O_x exhibited the highest catalytic performance, the conversion of isobutane was 10.8%, the yield of MAA+MAL was about 6.5%.

Quantum Chemistry Studies on Halogen-benzylidene-quinolin-8-ol Alumium Complex

CHEN Zhao-Xing, LI Qin-Yu, XU Xuan, ZENG He-Ping

2007, 28(2):  338-341.  doi:

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The geometric configurations of tris{5-[(2'-fluoro-4'-bromo-benzylidene)-amino]-quinolin-8-ol} aluminum(AlA₃) and 5-[(2'-fluoro-4'-bromo-benzylidene)-amino]-quinolin-8-ol were optimized by PBE0 method. The electronic spectra of the complex and ligand were calculated by TDDFT method. It is indicated from the calculation that: (1) for the larger Pauli repulsion of ligand, the interaction energy of AlA₃ is weaker than that of tris(8-hydroxy quinolinato)aluminum(AlQ₃);(2) the maximal absorption wavelength of AlA₃, which is assigned to charge transfer between different quinolin-8-ol, is the characteristic band of AlQ₃ analogue. The decrease of LUMO energy results in a red shift in electronic absorption spectrum compared to that of AlQ₃;(3) the 269 nm band is assigned to charge transfer from CN group to quinolin-8-ol.

Synthesis and Properties of Dimeric 1,3,4-Oxadiazoles Derivatives with Flexible Linkers and End-alkoxy Groups

WANG Huan, ZHANG Ning, WEN Shan-Peng, TIAN Wen-Jing

2007, 28(2):  342-345.  doi:

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Dimeric 1,3,4-oxadiazoles derivatives with flexible linkers and end-alkoxy groups, namely 1,3-bis[2-(4-alkyoxyphenyl)-1,3,4-oxidiazole-5-yl]-5-[3 or 6-(4-methoxyphenoxy) alkoxy]-benzene(OXDs) were synthesized, and the chemical structures of the OXDs were confirmed by ¹H NMR, elemental analysis and FTIR. The optical, electrochemical and thermal properties of the OXDs were investigated by using UV-Vis, PL, CV and DSC. It is indicated that intramolecular exciplex can be formed between the 4-methoxyphenoxy and bis[2-(4-alkyoxyphenyl)-1,3,4-oxidiazol] and the end-alkoxy groups could restrain the formation of the intramolecular exciplex. The electrochemical properties of the OXDs show that OXDs were favorable for the electron injecting, transporting and hole blocking. DSC results prove that when the OXDs were substituted with shorter alkoxy groups(or without substituents), the crystal contents in OXDs were less in solid state and the stable non-crystalline morphology can be formed after heat-treating.

Effect of Adding MgNi₂ on Electro-chemical Performance of AB₅-type Hydrogen Storage Alloys

JIAO Li-Fang, LIU Qiang, YUAN Hua-Tang, WANG Yi-Jing, FENG Yan

2007, 28(2):  346-349.  doi:

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A small amount of MgNi₂ was melted with AB₅ alloys which were analyzed by ICP, XRD and SEM. EIS, CV, cyclic anodic polarization curves and charge/discharge measurements were carried out to study the electrochemical properties of alloy B and mechanism of hydrogen storage. The experimental results show that the battery with alloy B as MH electrode shows higher and wider voltage platform, better high-rate charge/discharge capability and stability compared to alloy A as MH electrode. The electrochemical investigation strongly indicates that the improved characteristics are the result of the increased electrochemical catalytic activity due to the increment of the conductive surface area, the reduction of the contact resistance between alloy particles and the increased corrosion resistance of alloys.

研究快报

Theoretical Study of Water Decomposition on TiO₂ Surface


WEI Zhi-Gang^1,2, LI Qian-Shu², ZHANG Hong-Xing¹, Lewis James P.³

2007, 28(2):  350-351.  doi:

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Density functional theory and pseudopotential method were employed to investigate one water molecule decomposition on perfect TiO₂ rutile(110) surface. First we build up a surface, which is large enough to simulate this reaction as under the real condition. Then we put a water molecule on the top of one five-fold-coordinate Ti atom on the surface as the reactant; we put two OH radicals at the corresponding position of the surface as the product. At last we simulate the reaction from the reactant to the product to get the reaction free energy, which is about 15.562 kJ/mol. This free energy can fit well with the experimental results.

研究简报

Effect of Rare Earth Ions on Electro-oxidation of Methanol


WANG Hai-Tao^1,2, ZHAO Mei-Ling², XU Wei-Lin¹, XING Wei¹, LU Tian-Hong¹

2007, 28(2):  352-354.  doi:

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Four kinds of rare earth metal Ions(Y³⁺, Tb³⁺, Eu³⁺ and Pr³⁺) were appended into the methanol aqueous solution respectively as an additive and the cyclic voltammograms of the aqueous solutions were studied. The results show that Y³⁺ and Tb³⁺ had an obvious promotion effect on the electro-oxidation of methanol. The additives Y³⁺ and Tb³⁺ could improve the methanol anodic oxidation current by 85%, and Eu³⁺ and Pr³⁺ had little promotion effect on the electro-oxidation of methanol. The results also show that the promotion effect of the rare earth metal ions were related with the electronic distribution of these elements and their adsorption on the Pt electrode surface.

Preparation and Characterization of In(OH)₃ Nanocrystal with High Photocatalytic Activity and Stability

CHEN You-San, WANG Xu-Xu, LI Dan-Zhen, FU Xian-Zhi

2007, 28(2):  355-357.  doi:

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In(OH)₃ photocatalyst was prepared using ultrasonic hydrolysis precipitation followed by calcining at temperature lower than 160 ℃. The characterizations by XRD, DRS, TG-DSC, TEM and FTIR show that the solid is a cubic crystal with 10—15 nm size, and has two band gaps, direct band gap 5.48 and indirect gap 5.02 eV. Evaluation of the photocatalytic activity toward oxidation reactions of benzene under UV irradiation (λ_max=254 nm) showed that In(OH)₃ presented much higher photoactivity and active stability than commercial Degussa-P25 TiO₂. FTIR characterization for the samples before and after the photocatalytic reaction suggested that the better photocatalytic behavior of In(OH)₃ than the TiO₂ is due to lower aggradations of the intermediate species on its surface in photocatalytic process.

研究论文

Spontaneous Vesicle Formation of Polymeric Borate Ester Surfactant


WANG Hai-Ying, LI Bin-Dong, HU An-Jun, L&Uum

2007, 28(2):  358-361.  doi:

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Using azobis(iso-butyro) nitrile(AIBN) as the initiator, a novel vesicle from polymric borate ester(PMBE)surfactant was prepared by direct polymerization of N-hydroxymethyl acrylamide, triethyl borate and N,N-dihydroxyethyl dodecylamine. The PMBE was characterized by FTIR, ¹H NMR and GPC. The self-aggregate morphologies of PMBE in pure water and 0.1 mol/L NaCl solution were observed by TEM. The results show that the vesicle was formed spontaneously from PMBE both in water and NaCl aqueous solution. The diameter of PMBE vesicle is about 20 nm in pure wate. In 0.1 mol/L NaCl solution, the diameter increases to the range from 150 nm to 250 nm. The mechanism of PMBE vesicle formation was discussed preliminarily by packing parameter theory of amphiphilic molecules and approximate processing method.

Synthesis and Characterization of Novel Sulfonated Poly(arylene ether nitrile ketone)s Containing Dicyanoarylene Group

CHEN Yong, WANG Shuan-Jin, XIAO Min, MENG Yue-Zhong

2007, 28(2):  362-365.  doi:

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A novel monomer of bisphenol containing dicyanoarylene group was synthesized and followed by copolymerization with activated dihalides to give a series of sulfonated poly(arylene ether nitrile ketone)s with a high molecular weight. The structures of the copolymers were characterized by ¹H NMR and elemental analysis. The acid-form membranes of the copolymers exhibited an excellent thermostability, good proton conducti-vity, dimensional and chemical stabilities as well as superior mechanical strength demonstrated by the corresponding technologies available. Which denomstrate the membranes prepared are promising candidate for PEMFC application.

Synthesis and Characterization of Polyurethane-grafted Multi-walled Carbon Nanotubes

WANG Xiao¹, ZHANG Chen¹, LIU Yan-Xin¹, LI Cong-Ju², DU Zhong-Jie¹, LI Hang-Quan¹

2007, 28(2):  366-370.  doi:

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Covalent graft-functionalization of multi-walled carbon nanotubes(MWNTs) with polyurethane was prepared successfully by two steps. First, hydroxyl groups and a small amount of carboxyl groups on the surface of acid-treated MWNT reacted with linear poly(acryloyl chloride) to generate graft on MWNT; secondly, the remaining acryloyl chloride groups were subjected to esterification with hydroxy-terminated polyurethane making chains graft on the surface of MWNTs. The characterizations of the grafted MWNT samples thus obtained by using Fourier transform infrared spectrometer(FTIR), transmission electron microscopy(TEM) and scanning electron microscopy(SEM) indicate that polymer was covalently attached to the surface of MWNT. Thermogravimetric analysis(TGA) of the functionalized MWNTs shows that the weight ratio of polymer attached to the nanotubes surface was about 90%.

Shape-memory and Biocompatibility Properties of Segmented Polyurethanes Based on Poly(L-lactide)

PING Peng^1,2, WANG Wen-Shou^1,2, Zhang Pei-Biao¹, CHEN Xue-Si¹, JING Xia-Bin¹

2007, 28(2):  371-375.  doi:

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A series of segmented poly(L-lactide)-polyurethanes(PLA-PU) were synthesized by a two-step method, with oligo-poly(L-lactide)(PLA) as the soft segments and the reaction product of 2,4-toluene diisocyanate(TDI) and ethylene glycol(EG) as the hard segments. The shape memory properties of PLA-PUs were examined. The processed PLA-PUs could recover almost 100% to their original shape within 10 ℃ from the lowest recovery temperature. In the recovery process, the PLA-PUs showed a maximum contracting stress of shape change in the range of 1.5—4 MPa depending on the PLA segmental length and the hard-segmental content and higher than that of poly(ε-caprolactone polyurethane)(PCL-PU). Besides, the influence of deforming and fixing temperatures on shape memory properties of PLA-PU was studied in detail. They could affect not only the recovery temperature but also the maximum contracting stress. The experiments of cell incubation were used to evaluate the biocompatibility of PLA-PU. The results show that the biocompatibility of PLA-PU is comparable to that of the pure PLA.This kind of polyurethane can be used as implanted medical devices with a shape memory property.

Preparation of Poly(3-acrylamidophenylboronic Acid-co-N,N-dime-thylacrylamide-co-acrylamide)hydrogels and Investigations on Their Sugar-sensitive Properties

LI Bo, TENG Da-Yong, WANG Zhen, LI Chao-Xing

2007, 28(2):  376-381.  doi:

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Glucose-sensitive porous poly(3-acrylamidophenylboronic acid-co-N,N-dimethylacrylamide-co-acrylamide)[P(AAPBA-co-DMAA-co-AAm)]hydrogels were prepared by radical copolymerization in dimethyl sulphoxide(DMSO) solution. At Physiological pH condition(pH 7.4, 37 ℃), the sensitivity of the Hdro gels to the sugar-concentration was investigated, and the influence of the component on the swelling ratio was studied at the same time. At the given range, with the increase of the contents of AAPBA and AAm in the gels. Compared with conventional biblock polymer, this hydrogel preserved an excellent sensibility to sugar-concentration and could response when the mass concentration of glucose is above 200 mg/dL, which approaches to diabetic's threshold of blood sugar. The swelling ratio of this hydrogel reached more than 10 times. At the same time, the response time to concentration of glucose decreased to 2—3 h. The results of surging experiment show the porous hydrogel possesses an excellent stimulate-response capability to sugar. Therefore, these novel porous Hdrogels have potential for the controlled release of drugs, especially for the micro molecular drugs.

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Preparation of Sulfated Zirconia/Silica Complex Nanofibers by Electrospinning Method

ZHAO Yi-Yang, WANG Hai-Ying, LI Xiang, YANG Yang, YANG Min, WANG Ce

2007, 28(2):  382-384.  doi:

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Sulfated zirconia/silica(SZ/SiO₂) complex nanofibers were prepared by combining electronspinning technique and sol-gel method. First, a silica sol was electrospun at a voltage of 12 kV, then the as-electrospun silica nanofibers were immersed into a sulfated zirconia sol afterwards with a thermal treatment to obtain the SZ/SiO₂ complex nanofibers. These fibers were examined by SEM, TEM, FTIR, XRD and SPS. The results indicate that the SZ nanopaticles with the average diameter of about 8 nm were disspered on the surface of silica fibers which had an average diameter of about 170 nm. The complex nanofibers had an amorphous structure. The observation of the surface-related transitions at the SPS spectrum indicates the presence of positive charges on the surface of the complex fibers.

研究简报

Growth of Novel Stereo-open Spherulites in a Bisphenol-A Polycarbonate/Dioctyl Phthalate Blend at Hydrostatic Pressure

LÜ Jun^1,2, Oh Il-Kwon

2007, 28(2):  385-387.  doi:

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Bisphenol-A polycarbonate/dioctyl phthalate blend samples crystallized at a hydrostatic pressure were investigated by WAXD, DSC and SEM measurements. Some novel stereo-open spherulitic structures, i.e., peony-, cabbage-, seaweed-, and lotus-like spherulites, were observed which belong to a three-dimensional structure and were only composed of crystalline region. The foleded-chain lamellar crystal was proved to be the sub-structure of these spherulites. This study also suggests a new route to grow such crystals so as to promote the understanding of the formation process and mechanism of polymer spherulites.

Synthesis of a Novel Blue Light-emitting Hyperbranched Polymer

WANG Hai-Qiao¹, WANG Huan-Fang¹, LU Hong-Bin², LU Chun-Liang¹, LI Xiao-Yu¹

2007, 28(2):  388-390.  doi:

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A partial conjugated hyperbranched light-emitting polymer was obtained by copolymerization of a fluorescent A₂ monomer and a non-conjugated B₄ monomer. The polymer displays a good thermal stability compared with its linear counterparts, and a good solubility, controllable luminescent properties compared with full-conjugated light-emitting polymers.

Polyaniline Morphological Regulation and Control Under Alkaline Condition

YAN Xue, LIU Na, JIN E, WANG Xing, ZHANG Wan-Jin

2007, 28(2):  391-393.  doi:

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Morphology of polyaniline was tunable during in situ oxidative polymerization of the monomer aniline simply by changing pH values within the alkaline region, which could be regulated from tubular to spherical shapes with pH being increased. UV-Vis and FTIR spectra were used to characterize the molecular structures of the assembled samples, which was responsible for the lower electrical conductivity.

Novel Biomimetic Polymeric Micelles for Drug Delivery

XU Jian-Ping, CHEN Wei-Dong, JI Jian, SHEN Jia-Cong

2007, 28(2):  394-396.  doi:

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Novel amphiphilic polymers, cholesterol-end-capped poly(2-methacryloyloxyethyl phosphorylcholine)(CMPC) was specially designed as the drug delivery systems. Cytotoxicity of this novel amphiphiles was not observed as indicated by cell culture. Anti-cancer drug adriamycin(ADR) was incorporated into the micelles by oil-in-water method. The release of ADR from the nanosphere continued over 7 d. The drug-loaded micelles could effectively restrain the growth of cancer cell. These results suggest that the drug loaded nanoparticles could be a good candidate for injectable drug delivery carrier.