Liang-Quan Sheng

Fuyang Teachers College, Yingchow, Anhui Sheng, China

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Publications (17)12.2 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: A high performance liquid chromatography with fluorescence detection (HPLC-FLD) method for the simultaneous determination of total nitrofuran metabolite residues (furazolidone, furaltadone, nitrofurantoin, and nitrofurazone) in shrimp was developed. The method involves the acid hydrolysis of protein-bound metabolites, followed by the derivatization of the freed metabolites with the new fluorescent derivatization reagent 2-hydroxy-1-naphthaldehyde (HN) and subsequent liquid-liquid extraction (LLE). Separation is achieved on a YMC-Pack Polymer C18 column under alkaline conditions, and the high fluorescence intensity of the derivatives at an emission wavelength Em=463nm (Ex=395nm) enables, for the first time, their simultaneous determination in shrimp at concentrations as low as 1μg/kg by HPLC-FLD. The method was validated using blank shrimp fortified with all four metabolites at 0.5, 1.0 and 2.0μg/kg. Recoveries were >87% with relative standard deviations of <8.1% for all four metabolites. Furthermore, the results obtained by HPLC-FLD were in very good agreement with those obtained by LC-MS/MS analysis.
    Journal of Chromatography A 12/2013; · 4.61 Impact Factor
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    ABSTRACT: A simple and sensitive HPLC method with fluorescence detection (HPLC-FLD) is reported for the simultaneous determination of metabolites of four nitrofuran drugs (furazolidone, furaltadone, nitrofurantoin and nitrofurazone) in pork muscle. The method involves acid hydrolysis of the protein-bound drug metabolites and the conjugation of the released side-chains with a novel fluorescence agent 2-hydroxy-1-naphthaldehyde. After liquid-liquid extraction and effective separation of the derivatives on a YMC-Pack Polymer C18 column at 40°C under alkaline conditions, the high fluorescence intensity of these derivatives at emission wavelength λem = 463 nm enables their simultaneous determination in pork muscle at concentrations as low as 1 µg kg(-1). The method was validated using blank pork muscle fortified with all four metabolites at 0.5, 1.0 and 2.0 µg kg(-1). Recoveries were > 92.3% with RSDs < 8.5% for all four metabolites. The results obtained with HPLC-FLD and LC-MS/MS methods showed very good agreement for pork muscle samples.
    Food Additives and Contaminants - Part A Chemistry, Analysis, Control, Exposure and Risk Assessment 11/2013;
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    ABSTRACT: Six new coordination polymers [Cd2(HL)2(pbda)(H2O)2]·4H2O (1), [Cd2(HL)2(mbda)(H2O)2]·6H2O (2), [Cd(H2L)(mmbda)(H2O)] (3), [Cd2(H2L)2(btca) (H2O)2]·4H2O (4), [Zn2(H2L)2(btca)] (5) and [Zn6(H2L)6(btca)3] (6) were synthesized by reactions of cadmium(II)/zinc(II) salts with a rigid ligand 1-(1H-imidazol-4-yl)-3-(4H-tetrazol-5-yl)benzene (H2L) and different carboxylic acids of 1,4-benzenedicarboxylic acid (H2pbda), 1,3-benzenedicarboxylic acid (H2mbda), 5-methyl-1,3-benzenedicarboxylic acid (H2mmbda), 1,2,4,5-benzenetetracarboxylic acid (H4btca), respectively. The structures of the complexes were determined by single crystal X-ray diffraction analysis. Although complexes 1 and 2 possess the same two-dimensional (2D) network with (4·82)-fes topology built from Cd(II)–(HL)− moieties, different coordinated orientation of auxiliary carboxylates of pbda2− and mbda2− pillar the 2D layer into distinct frameworks. Complex 1 is an unusual binodal (3,4)-connected three-dimensional (3D) dmc net with Point (Schläfli) symbol of (4·82)(4·85) while 2 is a rare binodal (3,4)-connected 3D architecture with a (4·6·8)(4·62·83) fsc-3,4-C2/c topology. Complexes 3 and 4 have the same 2D networks with (4,4) topology, and H-bonding or π–π stacking interactions extending the 2D layers into 3D supramolecular frameworks, respectively. Complexes 5 and 6 present a pair of pseudopolymorphs, and 5 is an uninodal (4,4)-connected 3D net with Point (Schläfli) symbol of (62·84)(64·82)2 while 6 is an unprecedented penta-nodal 4-connected net with (4·62·83)2(4·64·8)2(62·84)(64·82)4 topology. The thermal stability and photoluminescent property of the complexes were investigated.
    CrystEngComm 06/2013; · 3.88 Impact Factor
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    ABSTRACT: A high performance liquid chromatography with fluorescence detection (HPLC–FLD) method for the simultaneous determination of total nitrofuran metabolite residues (furazolidone, furaltadone, nitrofurantoin, and nitrofurazone) in shrimp was developed. The method involves the acid hydrolysis of protein-bound metabolites, followed by the derivatization of the freed metabolites with the new fluorescent derivatization reagent 2-hydroxy-1-naphthaldehyde (HN) and subsequent liquid–liquid extraction (LLE). Separation is achieved on a YMC-Pack Polymer C18 column under alkaline conditions, and the high fluorescence intensity of the derivatives at an emission wavelength Em = 463 nm (Ex = 395 nm) enables, for the first time, their simultaneous determination in shrimp at concentrations as low as 1 μg/kg by HPLC–FLD. The method was validated using blank shrimp fortified with all four metabolites at 0.5, 1.0 and 2.0 μg/kg. Recoveries were >87% with relative standard deviations of <8.1% for all four metabolites. Furthermore, the results obtained by HPLC–FLD were in very good agreement with those obtained by LC–MS/MS analysis
    Journal of Chromatography A. 01/2013;
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    Hua-Jie Xu, Xue-Yue Jiang, Liang-Quan Sheng, Zhao-Di Liu
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    ABSTRACT: The title compound, C(15)H(9)ClN(2)O(2), adopts an E configuration about the C=N double bond. The mean plane of the isoindoline ring system [maximum deviation = 0.011 (2) Å] is inclined to the chloro-benzene ring by 22.62 (8)°. In the crystal, mol-ecules are connected by C-H⋯O hydrogen bonds, forming chains that propagate along [010].
    Acta Crystallographica Section E Structure Reports Online 12/2011; 67(Pt 12):o3184. · 0.35 Impact Factor
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    Na-Na Du, Hua-Jie Xu, Liang-Quan Sheng
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    ABSTRACT: In the title compound, C(16)H(16)N(4)O(6), the planes of the isoindole and dinitro-benzene groups make a dihedral angle between of 84.15 (8)°. The N atom of the isoindole group is displaced by 0.2937 (3) Å from the plane through the remaining atoms. An intra-molecular N-H⋯O inter-action occurs. In the crystal, inversion dimers linked by pairs of N-H⋯O hydrogen bonds occur.
    Acta Crystallographica Section E Structure Reports Online 08/2011; 67(Pt 8):o1970. · 0.35 Impact Factor
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    Na-Na Du, Hua-Jie Xu, Chong-Fu Song, Liang-Quan Sheng
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    ABSTRACT: The title compound, C(19)H(21)N(3)O(4), crystallizes with two independent mol-ecules in the asymmetric unit. In both mol-ecules, there is an intra-molecular O-H⋯N hydrogen bond, which correlates with the fact that each mol-ecule adopts an E configuration with respect to the C=N bond. In the crystal, there are C-H⋯O and C-H⋯π inter-actions present.
    Acta Crystallographica Section E Structure Reports Online 07/2011; 67(Pt 7):o1740. · 0.35 Impact Factor
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    Liang-Quan Sheng, Hua-Jie Xu, Na-Na Du, Xue-Yue Jiang
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    ABSTRACT: The title compound, C(14)H(11)N(3)O(3), adopts an E or trans configuration with respect to the C=N bond. In the mol-ecule there is an intra-molecular O-H⋯N hydrogen bond involving the hy-droxy substituent at the 2-positon of the naphthalene ring and the adjacent methyl-ene-amino N atom. The mol-ecule is roughly planar, the dihedral angle between the naphthalene and imidazolidine-2,4-dione mean planes being 8.4 (1)°. In the crystal, pairs of N-H⋯O hydrogen bonds link mol-ecules into inversion dimers. These dimers are futher linked via C-H⋯O inter-actions, forming a three-dimensional network.
    Acta Crystallographica Section E Structure Reports Online 01/2010; 66(Pt 7):o1601. · 0.35 Impact Factor
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    Liang-Quan Sheng, Hua-Jie Xu, Na-Na Du, Xue-Yue Jiang
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    ABSTRACT: The title compound, C(13)H(12)N(2)O(3), has an E configuration with respect to the C=N bond: the conformation is stabilized by an intramolecular O-H⋯N hydrogen bond. In the crystal, an N-H⋯O interaction links the molecules into a C(4) chain along [100].
    Acta Crystallographica Section E Structure Reports Online 01/2010; 66(Pt 12):o3046. · 0.35 Impact Factor
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    ABSTRACT: The title compound, C(12)H(11)N(3)O(2), adopts an E or trans configuration with respect to the C=N bond. There is an intra-molecular O-H⋯N hydrogen bond involving the hydroxyl H atom and an N atom of the hydrazine group. In the crystal structure, mol-ecules are connected via N-H⋯O hydrogen bonds, forming a three-dimensional network.
    Acta Crystallographica Section E Structure Reports Online 01/2009; 65(Pt 5):o1047. · 0.35 Impact Factor
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    Hua-Jie Xu, Liang-Quan Sheng, Zhao-Di Liu, Si-Chang Shao
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    ABSTRACT: The title compound, C(14)H(11)FN(2)O(2), adopts an E or trans configuration with respect to the C=N bond. An intra-molecular N-H⋯O hydrogen bond contributes to the relatively planarity of the mol-ecular conformation; the two benzene rings are inclined to one another by 12.5 (2)°. In the crystal structure, inter-molecular O-H⋯O hydrogen bonds link the mol-ecules into chains running parallel to the c axis.
    Acta Crystallographica Section E Structure Reports Online 01/2009; 65(Pt 4):o666. · 0.35 Impact Factor
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    ABSTRACT: The interaction of BSA and NIC was investigated by absorption spectra, fluorescence spectroscopy and synchronous fluorescence spectroscopy. In the system of sodium phosphate dibasic-citric acid of 0.1 mol(-1) x L(-1), fluorescence titration showed that the fluorescence intensity of BSA at 342 nm was quenched when NIC was added, NIC was capable of binding with BSA to form a 1:1 complex and the quenching mechanism of BSA affected by NIC was shown to be a static quenching procedure by calculating the binding number n and binding constant K. NIC decreased the intensity of the characteristic absorption peak of BSA, showing that the binding of NIC to BSA had strong impact on protein conformation with the decrease in a-helical content of the protein. Synchronous fluorescence indicated that the binding of NIC to BSA is near tryptophan subunit.
    Guang pu xue yu guang pu fen xi = Guang pu 03/2007; 27(2):306-8. · 0.29 Impact Factor
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    ABSTRACT: Cerium incorporated MCM-48 molecular sieves have been hydrothermally synthesized using a mixed template and pH adjusting route. The samples were characterized by various physicochemical methods, including X-ray diffraction, diffuse reflectance UV-Vis spectroscopy, FTIR spectroscopy, XRF spectroscopy, and nitrogen adsorption. These results reveal that cerium is incorporated in MCM-48 and it is in the form of well-dispersed tetra-coodinated cerium ion. The proper concentration of cerium and adjusting pH can keep Ce-MCM-48 with higher specific surface area , larger unit-cell parameter, narrower pore-size distribution, and thicker pore wall than those of MCM-48. These deduce higher activity, and better selectivity, thermal stability and hydrothermal stability than those of MCM-48. The concentration of Ce incorporated in MCM-48 affects the vibration of the framewoke Si of molecular sieves.
    Guang pu xue yu guang pu fen xi = Guang pu 04/2006; 26(3):484-7. · 0.29 Impact Factor
  • Hua-Jie Xu, Zhao-Di Liu, Liang-Quan Sheng
    Acta Crystallographica Section E-structure Reports Online - ACTA CRYSTALLOGR E-STRUCT REP. 01/2006; 62(10).
  • Yue-Qin Xie, Liang-Quan Sheng, Wei Zhu, Si-Chang Shao
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    ABSTRACT: The title mol­ecule, C13H9Cl2N3O, adopts a trans configuration with respect to the C=N double bond. There are two molecules in the asymmetric unit. The dihedral angles between the two rings are 17.2 (3) and 145.4 (3)°. The crystal structure is stabilized by inter­molecular N—H⋯O hydrogen bonds which link the mol­ecules into a chain structure.
    Acta Crystallographica Section E Structure Reports Online 01/2006; 62(1). · 0.35 Impact Factor
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    ABSTRACT: The mol­ecule of the title compound, C14H10Cl2N2O2, is roughly planar and displays a trans configuration with respect to the C=N double bond. The dihedral angle between the two benzene rings is 14.5 (2)°. The compound adopts a chain structure which is stabilized by inter­molecular O—H⋯O hydrogen bonds.
    Acta Crystallographica Section E Structure Reports Online 06/2005; 61(6). · 0.35 Impact Factor
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    ABSTRACT: In this study, the pretreated glassy carbon electrode (GCE) was prepared by electrochemical oxidation firstly at +1.75 V for 300 s, and then by electrochemical reduction at –1.75 V for 300 s in 0.1 mol L –1 pH 7.0 phosphate buffer solution (PBS) and used for the determination of dopamine (DA) by cyclic voltammetry (CV). The pretreated GCE gives 100-fold greater current responses for dopamine compared with unpretreated GCE. The effect of pH, pretreated mode, scan rate and concentration of dopamine on the peak current was investigated, and the results indicated that the peak current of dopamine is the highest in 0.1 mol L –1 pH 7.0 PBS and the electrode reaction corresponds to a rate-controlled process. The peak current of the anodic peak and the concentration of dopamine hydrochloride is linear in the range of 1.0 × 10 –7 – 9.0 × 10 –6 mol L –1 and 1.2 × 10 –5 – 8.0 × 10 –5 mol L –1 with correlation coefficients of 0.9973 and 0.9980, and the detection limit is 3.0 × 10 –8 mol/L. It has been successfully applied to the determination of dopamine in dopamine hydrochloride injection with recoveries ranging from 98 to 103%. The proposed method possesses the distinct advantages of simple, appropriate for operation, good reproducibility and cheap instrument.