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J* E* C* N* U* N* S* 2005 Vol.2005 Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Studies on Evergreen Broad-leaved Forests of China: A Retrospect and Prospect(Chinese) SONG Yong-chang;CHEN Xiao-yong;WANG Xi-hua Journal of East China Normal University(Natural Sc    2005, 2005 (1): 1-8.   Abstract （3582）            Knowledge map    Save Study on evergreen broad-leaved forest(EBLF) of China started in 1930s and 1940s, flourished in 1950s,was interrupted in 1960s and has revived since the 1970s.Proposals concerning the further studies are offered, which includes compilation of annuals of EBLF of China, study on the origin and systematic development of EBLF, strengthen research on the mechanism of succession and restoration, the relationship and co-evolution between important species, ecological service function, effect and response to global change, conservation and utilization, and establishment of information system for EBLFs. Related Articles | Metrics | Comments（0） Select The Structure of a Class of Polynomial Differential Systems of Degree 5 with a 25th order Singularity(Chinese) SUN Ying;LI Xue-min Journal of East China Normal University(Natural Sc    2005, 2005 (1): 9-15,3.   Abstract （3008）            Knowledge map    Save Using Poincaré transformation and Poincaré-Bendixson theorem,sufficient conditions for the existence, uniqueness and stability of the limit cycles for a kind of fifth order differential equation are obtained. It is proved that such a kind of systems has at most one limit cycle and the existence is accompanied by the stability.Furthermore, almost all possible global phase portraits, 64 altogether, are indicated. Related Articles | Metrics | Comments（0） Select Nonlinear Stability of Two-dimentional Quasi- centerlinelargebf gestrophic Flow and Disturbance Development(Chinese) LI Na;LIU Yong-ming Journal of East China Normal University(Natural Sc    2005, 2005 (1): 16-22.   Abstract （3152）            Knowledge map    Save We concerns with two-dimentional zonally symmetric one layer quasi-gestrophic flow in a bounded periodic zonal channel. A best nonlinear stability criterion is established for the flow. For Benzi’s model, the nonlinear stability criterion is shown identical to the linear one. Moreover, explicit rigorous upper bounds are obtained on both the disturbance energy and disturbance potential enstrophy. Related Articles | Metrics | Comments（0） Select Some Properties of Partial Order in Banach* Algebras(Chinese) WEI Chang-guo Journal of East China Normal University(Natural Sc    2005, 2005 (1): 23-27.   Abstract （2678）            Knowledge map    Save Some problems on the partial order in Banach* algebras and C*-algebras are studied. The uniqueness of the multiplicative cone which contains all the positive elements of the C*-algebra is discussed. Conditions of Banach* algebras becoming C*- algebras are presented. Related Articles | Metrics | Comments（0） Select The Solutions of Matrix Function Equation f(X)=A(Chinese) CHENG Xue-han;LIU Ai-jing; Journal of East China Normal University(Natural Sc    2005, 2005 (1): 28-33.   Abstract （3144）            Knowledge map    Save We give the sufficient and necessary conditions of the solutions for matrix function equations f(X)=A , where A∈Cn×n .We study the expression of the solutions by the polynomial of A, also give the sufficient and necessary conditions. Related Articles | Metrics | Comments（0） Select Large bf Crossing Number of the Generalized Petersen Graph G(2m+1,m)(Chinese) MA Deng-ju;REN Han;LU Jun-jie Journal of East China Normal University(Natural Sc    2005, 2005 (1): 34-39.   Abstract （2653）            Knowledge map    Save It is proved that he lower bound on the crossing number of the generalized Petersen graphs G(2m+1,m) is 3 by deleting edges. Then it showes the crossing number of the generalized Petersen graphs G(2m+1,m) is 3 exactly. Related Articles | Metrics | Comments（0） Select Moments of Compound Renewal Sums with Discounted(English) XIONG Shuang-ping Journal of East China Normal University(Natural Sc    2005, 2005 (1): 40-45.   Abstract （2953）            Knowledge map    Save Under the condition that the net force of interest is a Wiener processes with a drift, we derive the first two moments of a compound renewal present value risk Process(CRPVR) using renewal theory. An example is also given to explain the results. Related Articles | Metrics | Comments（0） Select Calculation of Ruin Probabilities under a Renewal Risk vskip1mmcenterlinebflarge Model with Interest Force(Chinese) LIN Qing-min;WANG Rong-ming Journal of East China Normal University(Natural Sc    2005, 2005 (1): 46-52.   Abstract （3327）            Knowledge map    Save Apart from ruin probability, the distribution of surplus immediately before ruin and that of deficit at ruin can also be used to characterize the risk of ruin in a insurance company. In this paper, these distributions are studied with a renewal risk model under interest force; the recursive algorithms and integral euations for the distributions are obtained. Related Articles | Metrics | Comments（0） Select A Package for Generating the Determining System of Nonclassical Symmetry of Differential Euations(English) ZHANG Shan-qing;LI Zhi-bin Journal of East China Normal University(Natural Sc    2005, 2005 (1): 53-58,1.   Abstract （2777）            Knowledge map    Save An algorithm for calculating the determining euations associated with non-classical method of symmetry reductions for system of partial differential euations (PDEs) is described.Based on this algorithm, an implementation bf NGDS on Maple for generating the determining euations for Lie non-classical symmetry groups of differential euation(s) is presented, and an example is illustrated the correctness and effectiveness of our package bf NGDS. Related Articles | Metrics | Comments（0） Select Calculating the Compact and Posture Ratio of An Image Region Based on VCC WANG Di-qiong;ZHANG Wei;GU Guo-qing Journal of East China Normal University(Natural Sc    2005, 2005 (1): 59-62.   Abstract （2937）            Knowledge map    Save Introduced a way of utilizing VCC to get the perimeter of an image region, the length and width of the minimum external rectangle of the image and the size of the region occupied by the image. Based on this, a new method to calculate the compact and the posture ratio of the image is proposed. Related Articles | Metrics | Comments（0） Select Structure and Longitudinal Magnetoimpedance Effect of Permalloy Films by Electrodeposition(English) GONG Feng-fei;Kamel A;SHEN Guo-tu;YUAN Wang-zhi;YANG Xie-long Journal of East China Normal University(Natural Sc    2005, 2005 (1): 63-67.   Abstract （2982）            Knowledge map    Save The structure of electrodeposited permalloy films with thickness from 1.1μm to 6.9μm is determined to be fcc structure by using X-ray diffraction, which the intensity of NiFe(111) peak increases significantly. Magnetic hysteresis loops of the films demonstrate the decrease of their coercivity values with the increase of the film thickness. Longitudinal magnetoimpedance ratio is measured with an alternating current of Irms=6 mA and frequency from 0.05 kHz to 600kHz. The minimum value of longitudinal magnetoimpedance ratio is down to -52%. Related Articles | Metrics | Comments（0） Select GMI Effect Study of Amorphous FeCuNbSiB Multilayered Films(English) Oumarou M;LI Xiao-dong;YUAN Wang-zhi;RUAN Jian-zhong;ZHAO Zhen-jie;YANG Xie-long Journal of East China Normal University(Natural Sc    2005, 2005 (1): 68-72,1.   Abstract （2951）            Knowledge map    Save Giant magneto-impedance (GMI) has been observed in amorphous FeCuNbSiB/Cu/FeCuNbSiB sandwiched films annealed at 250℃.The conductive layer is about 2μm while the outer magnetic layers are about 1μm thick each. The GMI ratio of 20% has been obtained. In the goal to improve this ratio, two insulator layers have been used between the different layers followed by an annealing process at 250℃.A GMI ratio of 62% has been obtained. The displacement of GMI peaks with increasing of driving current frequency appears also. The amorphous state of the films was confirmed by an X-ray diffraction and Mössbauer spectrum. Related Articles | Metrics | Comments（0） Select Study on the Practical Method to Tranform GPS Geodetic Coordinates to Coordinates of Localsystem(Chinese) LIU Fei;ZHOU Lin-lin;YI Jian-fang Journal of East China Normal University(Natural Sc    2005, 2005 (1): 73-77.   Abstract （3356）            Knowledge map    Save Study about the transformation relationship among different coordinates systems has been made to solve the problems in the application of GPS. The precision of the simplified coordinates transformation formula has been analysed. It was shown that the rational simplification is necessary and it will help to enhance the efficiency of the GPS system, for example, the vehicle navigation and real-time monitoring systems. An example and a feasible method to solve the unkown parameter are provided. Related Articles | Metrics | Comments（0） Select Fractal Study on Landuse Structure and Form Change:The Case of Central Areas in Shanghai(Chinese) ZHAO Jing;XU Jian-hua;MEI An-xin Journal of East China Normal University(Natural Sc    2005, 2005 (1): 78-84.   Abstract （3819）            Knowledge map    Save Landuse structure and spatial form changes are studied for the central areas in Shanghai from 1947 to 2000. Based on the systems and the fractal theories, the information entropy and equilibrium degree of landuse structure are calculated and the fractal models of urban spatial forms are established for Shanghai.  The main conclusions are: (1) In the past 50 years, the information entropy and equilibrium degree of landuse structure of Shanghai are increasing gradually, the differences in areas of each landuse type are reducing and the urban landuse structure are approaching to equilibrium state. (2) Boundary dimensions of landuse form have been decreased and the boundary forms of all the landuse types changed more regular and smooth since 1996. (3) Based on radius dimension, an annular spatial form from residential area to industrial area and to farmland according to distance away from city center is established.  In the end, we summarized mechanism of landuse change as population explosion, science and technology advancement, economic growth, policy and society systems changing and so on. Related Articles | Metrics | Comments（0） Select Proposal to Build Meimaosha Reservoir as A New Water Resource of Shanghai (Ⅱ) The Rule of the Fresh Water on the Nanhui East Shoal over a Year(Chinese) CAO Yong;CHEN Ji-yu;LIU Jie; Journal of East China Normal University(Natural Sc    2005, 2005 (1): 85-91.   Abstract （3054）            Knowledge map    Save In order to understand the rule of the fresh water on the Nanhui east shoal, we have monitored the salinity over a year. After calculating, we know the percentage of the fresh water in the wet season and dry season is from 76.88 to 82.94 percent and from 35.04 to 42.66 percent respectively. If the seasonal and discontinuous fresh water resource is used efficiently, it will supply enough fresh water to the reservoir. The water discharge at Datong hydrometric station plays an important role to the fresh water on the Nanhui east shoal. We shall pay more attention to that there is fresh water when the water discharge at Datong station is less then 10,000 m3/s. The fresh water is affected by other factors such as wind, landform, Coriolis force etc. This paper gives the equations that represent the relationship between the discharge at the Datong station and the fresh water resource. Related Articles | Metrics | Comments（0） Select Distribution of Clay Minerals in the Yangtze Delta Plain and Its Paleoenvironmental Implication(Chinese) WU Yue-ying;CHEN Zhong-yuan;WANG Zhang-hua Journal of East China Normal University(Natural Sc    2005, 2005 (1): 92-98.   Abstract （3588）            Knowledge map    Save Clay minerals in 15 surficial samples and 5 profile samples from the Yangtze Delta plain were analyzed by X-ray diffraction. The result shows that clay mineral assemblage of the surfical sediments are distinguished by the coastline 7500-8000aBP, indicating different sediment sources and sedimentary environments. The change of content of illite vs. kaolinite in the profile sediments reflects the climate fluctuations since late Pleistocene. Related Articles | Metrics | Comments（0） Select A Forecast Model of Adjective Effect of Vegetation on Urban Air(Chinese) ZHOU Jian-hua;ZHOU Yi-fan Journal of East China Normal University(Natural Sc    2005, 2005 (1): 99-104.   Abstract （2777）            Knowledge map    Save The distribution and pattern of man-planting vegetable in a city has strong effect on the ecological environment in the city. However, how many vegetabe we have to plant? What planting pattern is most reasonable? Where should we to plant? Authors used three dimensional vegetation quantities（VQ）to describe the amount of vegetation in a city, set up the correlative equations between the amount of VQ and the concentration of air pollutant, and developed a computer software to forecast atmosphere quantity dynamically and to support making planting decisions. The precision of the forecast can meet the permitted limits of air monitor verified by relevant precision test. The results by this research are helpful in estimation of ecologically environmental quality in a city quickly, exactly, and dynamically. Related Articles | Metrics | Comments（0） Select Study on Reduction of Hexavalent Chromium by Sulfate-reducing Bacteria(Chinese) QU Jian-guo;SHEN Ru-xiang;XU Bo-xing;LI Fu-de Journal of East China Normal University(Natural Sc    2005, 2005 (1): 105-110.   Abstract （2827）            Knowledge map    Save Several Sulfate Eir Reducing Bacteria (SRB) strains, isolated from soil, were able to grow in the medium containing 800mg/L chromium(Ⅵ), The Cr(Ⅵ) disappeared when the strain 2-S-8 grew in the medium containing 75mg/L Cr(Ⅵ) for 36h.The strain was identified as Desulfovibrio sp. The results showed that high-toxic Cr(Ⅵ) was reduced to hypo-toxic Cr(Ⅲ) by SRB, and the Cr(Ⅵ) reduction was related to the reduction of sulfate, which was mainly carried out effect by metabolin of SRB. Related Articles | Metrics | Comments（0） Select Application of Potential Ecological Risk Index in Soil Pollution of Typical Polluting Industries(Chinese) ZHAO Qin-na;XU Qi-xin;YANG Kai Journal of East China Normal University(Natural Sc    2005, 2005 (1): 111-116.   Abstract （4990）            Knowledge map    Save The soil pollution characteristics of typical pollution industries in Shanghai were studied from the following aspects: basic physical property, pH, heavy metal pollution. The potential ecological hazards of heavy metal pollution were assessed by Las Hakanson Index. The results indicated that soil of typical pollution industries had been affected by former manufacturing process. The heavy metal pollution distributed in those factories, such as printing and dyeing factories, battery manufacturers, electric plating factories and oil refinery plants. The risk level of heavy metal Hg and Cd were relatively high, and followed by Pb、Cr、Zn、Ni and As. Countermeasures against the soil pollution of typical polluting industries are suggested. Related Articles | Metrics | Comments（0） Select Secretion of Thrombopoietin in Bacillus subtilis and the Effect of Propeptide(Chinese) ZHANG Mei-hua;ZHOU Jian;YANG Yu-feng;WU Zi-rong Journal of East China Normal University(Natural Sc    2005, 2005 (1): 117-121.   Abstract （3014）            Knowledge map    Save To understand the secretory expression of heterologous protein in Bacillus subtilis, especially of those from eucaryotes, also to reveal the role of propeptide, two recombinant plasmids containing TPO gene were cloned in Bacillus subtilis with or without propeptide, named Pro-TPO, SP-TPO respectively. PCR production fragment SP containing signal peptide was ligated with TPO and vector. The recombinant plasmid was transformed into DB403 and a positive clone DB403(SP-TPO) was obtained. Another recombinant was available at the same time with the regulatory sequence Pro containing signal peptide and propeptide, named DB403(Pro-TPO). The secretion of TPO of the three recombinants can be valued by means of ELISA and Western blot. DB403(Pro-TPO) was shown to have the ability of secreting TPO, however DB403(SP-TPO) was found no secretion. DB403(Pro-TPO) was administrated peritoneally to Babl/c mice and got the number of platelet increased by 84.2%(self control) and 99.7%(saline control). The results implied that TPO is expressed with native activity and propeptide is essential for the secretion of TPO. Related Articles | Metrics | Comments（0） Select (Chinese) Journal of East China Normal University(Natural Sc    2005, 2005 (1): 122-125.   Abstract （2327）            Knowledge map    Save Related Articles | Metrics | Comments（0） Select (Chinese) Journal of East China Normal University(Natural Sc    2005, 2005 (1): 126-128.   Abstract （2354）            Knowledge map    Save Related Articles | Metrics | Comments（0） Select (Chinese) Journal of East China Normal University(Natural Sc    2005, 2005 (1): 129-132.   Abstract （2410）            Knowledge map    Save Related Articles | Metrics | Comments（0） Select Synthesis and Characterization of Schiff Base Containing Thiocarbohydrazide(English) LI Lin;WANG Lin-sheng;HAO Zhen-wen;WANG Jia-yan Journal of East China Normal University(Natural Sc    2005, 2005 (1): 133-135.   Abstract （2436）            Knowledge map    Save Related Articles | Metrics | Comments（0） Select (Chinese) Journal of East China Normal University(Natural Sc    2005, 2005 (1): 136-138.   Abstract （2466）            Knowledge map    Save Related Articles | Metrics | Comments（0） Select (Chinese) Journal of East China Normal University(Natural Sc    2005, 2005 (1): 139-143.   Abstract （2352）            Knowledge map    Save Related Articles | Metrics | Comments（0） Select Decomposition of Indefinite Inner ProductH-normal Matrices(Chinese) Sheng Xing-ping;Chen Guo-liang Journal of East China Normal University(Natural Sc    2005, 2005 (2): 1-5,15.   Abstract （2945）            Knowledge map    Save This paper study decompositions of H-normal matrices in indefinite inner product.The results of Gohberg and Reichstein are extend. Related Articles | Metrics | Comments（0） Select Large Graft and Algebraic Connectivity of Trees(Chinese) YIN Shu-hua;;SHU Jin-long;WU Ya-rong; Journal of East China Normal University(Natural Sc    2005, 2005 (2): 6-15.   Abstract （3392）            Knowledge map    Save In this paper, the algebraic connectivity of trees is determined by grafting; meanwhile the relation between the algebraic connectivity and the diameter of two classes of trees is also determined. Related Articles | Metrics | Comments（0） Select Crossing Number of Certain Circular Graphs(English) LU Jun-jie;WU Ya-rong;REN Han Journal of East China Normal University(Natural Sc    2005, 2005 (2): 16-21，2.   Abstract （2759）            Knowledge map    Save This paper determines the exact values of circular graphs C(m,l)(5≤ m ≤ 12, l=3)， using methods of drawing and removal edges. Related Articles | Metrics | Comments（0） Select Exact Analytical Solutions of Nonlinear Coupled Scalar Field Equations(Chinese) ZHU Ju-ning;YAO Ruo-xia;LI Zhi-bin Journal of East China Normal University(Natural Sc    2005, 2005 (2): 22-26.   Abstract （3369）            Knowledge map    Save A system of nonlinear coupled scalar field equations is resolved on Maple, using a direct algebra method proposed recently by the authors; new and more general types of exact solutions are derived; and some mistakes made by other authors are corrected. Related Articles | Metrics | Comments（0） Select Feature Extraction Method for 12-Lead ECG Based on Wavelet Transform(Chinese) XU Jian-qiang;YUAN Zhen-dong;LI Gao-ping;LIN Jing-yu Journal of East China Normal University(Natural Sc    2005, 2005 (2): 27-32.   Abstract （3700）            Knowledge map    Save An algorithm to extract features of electro-cardio-gram (ECG) signal based on wavelet multi-resolution analysis is developed. The wavelet transform is used for the segmentation and the feature extraction of ordinary 12-lead ECG. The support vector machine is used to classify the unknown ECG signal. The result shows that feature extraction technology has an optimistic prospect. Related Articles | Metrics | Comments（0） Select Calculation of Euclidean Distance between Vertices Based on VCC(Chinese) ZHANG Wei;CHEN You-guang;GU Guo-qing Journal of East China Normal University(Natural Sc    2005, 2005 (2): 33-38.   Abstract （2923）            Knowledge map    Save This paper introduces the way of utilizing VCC to get the perimeter of an image region, the length and width of the minimum external rectangular (ab. MER) of the image and the size of the region occupied by the image. For digital images in square, triangular and hexagonal lattices, formulates respectively the methods of calculating the Euclid distance from vertex-chain-code of the region boundary. Related Articles | Metrics | Comments（0） Select Investigation of the Renormalization of Nucleon Scattering(Chinese) HUANG Jian-hua;YANG Ji-feng Journal of East China Normal University(Natural Sc    2005, 2005 (2): 39-45.   Abstract （2709）            Knowledge map    Save The renormalization of nucleon scattering is studied in nonperturbative regime. The failure of the conventional subtractive program in nonperturbative context is analyzed. The nontrivial relevance of renormalization prescriptions in calculating phase shift and the importance of physical boundary conditions in determining the choice of the prescriptions are discussed in the nonperturbative parametrization and illustrated with an example in the partial wave channel . Related Articles | Metrics | Comments（0） Select Study on Characters of the Transmissive Gain Spectrum of H-PDLC Volume Grating and Its DGE Simulation(Chinese) BU Ling-bing;CAI Ji-guang;SHEN Guo-tu;YANG Bao-cheng Journal of East China Normal University(Natural Sc    2005, 2005 (2): 46-51.   Abstract （3062）            Knowledge map    Save In this paper, characters of VPG’s transmissive gain spectrum were studied using numerical solution. Using these characters, the idea of a novel dynamic gain equalizer (DGE) was presented and the way how to simulate the DGE was given as well. From the simulation, it can be seen that such DGE works well. Related Articles | Metrics | Comments（0） Select Study on Microwave Plasma Excitation in a Cylindrical Cavity(Chinese) LIAO Bin;ZHANG Lian;AN Tong-yi;ZHU Shou-zheng Journal of East China Normal University(Natural Sc    2005, 2005 (2): 52-57.   Abstract （2992）            Knowledge map    Save According to resonant theory, it was justified that TM01p was the main mode in a cylindrical cavity . Finite difference time domain（FD-TD）in cylindrical coordinate system was used to simulate the electromagnetic field distributions inside the reactor to improve performances. The experimental results are in good agreement with the theoretical predictions. Related Articles | Metrics | Comments（0） Select Effects of Pulsed Electric Field on Suspension Cultures ofTaxus chinensis (Chinese) YE Hong;HUANG Lin-ling;CHEN Shu-de;ZHONG Jian-jiang Journal of East China Normal University(Natural Sc    2005, 2005 (2): 58-64.   Abstract （2798）            Knowledge map    Save Suspension culture of Taxus chinensis was used as a model plant cell system to study the effects of pulsed electric field (PEF) on cell growth and the biosynthesis of secondary metabolites. Different exposure time of PEF had different effects on Taxus chinensis cells in different cell growth phases. Significant intracellular enhanced accumulation of taxuyunnanine C (Tc, a bioactive secondary metabolite) was observed by exposing the cells in early exponential growth phase to a 30 min PEF. The Tc content increased by 30% after exposure to PEF, without any loss of dry cell weight compared with that of the control. Moreover, combination of PEF with sucrose feeding showed a great synergistic accumulative effect on secondary metabolite production. Related Articles | Metrics | Comments（0） Select Multicast Asynchrony Web Services in Distributed GIS(Chinese) REN Ming;BI Yu;WANG Cheng-dao Journal of East China Normal University(Natural Sc    2005, 2005 (2): 65-71.   Abstract （3214）            Knowledge map    Save Beginning from the application of distributed geography information system and considering the situation in one call that a client requests several services, the model of multicast asynchrony RPC was pro-posed. And the functions of each component and their call relationship each other were discussed. Finally, the method based on the thread pool and asynchrony Web Services was introduced to implement this model. Related Articles | Metrics | Comments（0） Select DEM Simulation of Sediment Movement in the Baogang Dock Frontal Channel(Chinese) LI Mao-tian;CHEN Zhong-yuan;XUE Yuan-zhong;GU Qing-hua Journal of East China Normal University(Natural Sc    2005, 2005 (2): 72-77.   Abstract （3338）            Knowledge map    Save the sediment variation in the Baogang dock frontal channel from 1994 to 2002 was simulated using DEM (Digital Elevation Model) and GIS (Geography Information System). The results were as fol-lowing: the Baogang dock channel was general character of erosional from 1994 to 2002, and the total erosion quantity is 113.563×106m3; the average rate of erosion was 14.195×106m3/a;From 1994 to 1999, the channel was erosional, and the total erosion quantity was 53.286×106m3; 1999 to 2002,Baogang dock channel was also erosional, and the total erosion quantity was 60.277×106m3. Sediment was distributing in the upside area about Shangduan Sand and the area between the Shangduan Sand and the New Liuhe Sand. The channel change was a result of the channel borderline conditions, water discharge, suspended sediment load and human activities. The continual movement of the Shanduan Sand to southeast exert potential pre-ssure on the development of Baogang dock. Related Articles | Metrics | Comments（0） Select On Standardization of Spatial Information System in Digital City(Chinese) WU Jian-ping;SUN Jian-zhong Journal of East China Normal University(Natural Sc    2005, 2005 (2): 78-84.   Abstract （3042）            Knowledge map    Save Based on the key technology research of spatial information system for digital Shanghai, the paper put forward standard system of spatial information system and standard application methods, including of identical application，equivalent application and selective application. Finally, according to the guide of standard drafting, It was summarized the method of relative standards drafting in construction of spatial information system. Related Articles | Metrics | Comments（0） Select Determination of β-agonists in Meat Products by Capillary Electrophoresis with Electrochemical Detection(Chinese) GUAN Yue-qing;CHU Qing-cui;YE Jian-nong Journal of East China Normal University(Natural Sc    2005, 2005 (2): 85-90,9.   Abstract （3175）            Knowledge map    Save A high-performance capillary electrophoresis with electrochemical detection (CE-ED) method has been applied for the determination of β-agonists, clenbuterol and salbutamol, in meat products. The effects of several factors such as the acidity and concentration of running buffer, the separation voltage, the applied potential and the injection time on CE-ED were investigated. Under the optimum conditions, these two components can be separated within 8 min at the separation voltage of 18 kV in a 40 mmol/L borax running buffer (pH 7.4). A 300 μm diameter carbon disk electrode was used as the working electrode positioned carefully opposite the outlet of the capillary in a wall-jet configuration at potential of +950 mV (vs. SCE). The response of clenbuterol and salbutamol was linear over two orders of magnitude with the detection limits (S/N=3) of 1.11×10-7 and 9.8×10-8 mol/L, respectively, and ascorbic acid does not interfere with the detection. The method has been successfully applied to analyze β-agonists in real-life samples, and the assay results were satisfactory. Related Articles | Metrics | Comments（0）