Shaoguan, China
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Xu Y.-Q.,Shaoguan College | Chen X.-K.,Shaoguan College | Chen Y.,Guangdong University of Technology | Huang D.-L.,Shaoguan College | And 2 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2012

In the present paper, the similar spectra of 18 samples, which include Astragalus, red-blue Astragalus and Codonopsis, were obtained in the range of 1 600~700 cm -1. The result showed that all kinds of herbs have their own characteristic similar spectra, and 18 samples can be identified according to the characteristic similar spectra. Furthermore, three correlation coefficients of 93 ganoderma samples were calculated which is in the range of 1 560~1 502, 1 460~1 421 and 1 319~1 260 cm -1 according to the information of similar spectrum of infrared spectrum of ganoderma. Without priori knowledge of the classification of these samples, the K-means cluster analysis can successfully divide them into four classes, i.e. Ganoderma lucidum and Ganoderma sinensis, Ganoderma atrum, Ganoderma aoshiba, Ganoderma multiplicatum. This result is consistent with the result of morphological classification.


Liang K.,Shaoguan College | Liu Q.,Hunan University of Science and Technology | Peng M.,Hunan University of Science and Technology
E-Polymers | Year: 2015

Cross-linked cationic polystyrene (CCPS) nanospheres with monodispersity were successfully generated by soap-free miniemulsion polymerization of styrene and divinylbenzene with 2,2′-azobis (2-amidinopropane) dihydrochloride as a water-soluble initiator. The effects of output power of the homogenizer and the concentration of the initiator and cross-linking agent on the particle size and coefficient of variation of CCPS nanospheres were systematically investigated and discussed. The weight percent of N element on the particle surface and the ζ potential were determined as different initiator concentrations were employed for the preparation of CCPS nanospheres. Furthermore, the technique of nitrogen adsorption/desorption was applied to characterize the specific surface area and the total pore volume of the CCPS nanospheres, which were generated from different amounts of divinylbenzene. Overall, the present study provides a simple route for producing cross-linked polymer nanospheres with monodispersity.


Kai L.,Shaoguan College | Qingquan L.,Hunan University of Science and Technology
Journal of Macromolecular Science, Part A: Pure and Applied Chemistry | Year: 2015

Hydroxyl-functionalized polystyrene (HFPS) microspheres were prepared by the copolymerization of styrene (St) and hydroxyethyl acrylate (HEA) via dispersion polymerization in the absence of steric stabilizers. The copolymerization was conducted with V-50 as an initiator. The effect of initiator concentration, HEA amount, and medium composition on the average diameters and coefficient variations of HFPS microspheres were systematically investigated. The particle morphology, the average diameters, the surface N content, and the particle size distribution curves were measured by SEM, XPS, and laser particle size analyzer. The results indicated that monodisperse HFPS microspheres with diameter of 0.6-1.0 m could be successfully generated by dispersion polymerization of St and HEA without steric stabilizers. Therefore, overall, the present manuscript provided a simple route to generate monodisperse hydroxyl-functionalized polymer microspheres. © 2015 Taylor & Francis Group, LLC.


Liang K.,Shaoguan College | Tang L.-Y.,Jiangsu University | Li G.-H.,Zhejiang University of Technology
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2011

TiO2/α-Fe2O3 and TiO2/α-FeOOH nanocomposite were fabricated by a hydrolysis- precipitation approach, using TiCl4 as precursor, α-Fe2O3 and α-FeOOH as supports. The crystal phase, diameter of crystallite and morphology of the samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM). The results indicated that the crystal phases of TiO2/α-Fe2O3 and TiO2/α-FeOOH nanocomposites were composed of α-Fe2O3 and rutile, α-FeOOH and anatase, respectively; Granular titania particles form a thin layer with a thickness of 5-20 nm on the surface of α-Fe2O3, and act as a shell on the surface of α-Fe2O3. TiO2/α-FeOOH is a kind of core-shell structure too, needle-like TiO2 particles aggregate around α-FeOOH core, and act as a shell with a thickness of 100-150 nm on the surface of α-FeOOH. The photocatalytic activity of the samples were evaluated by UV-vis spectrum and photo-degradation of MO under tungsten lamp irradiation. The results indicated that a synergistic effect existes between α-Fe2O3, α-FeOOH and TiO2 in the nanocomposite.


Zhang X.,South China University of Technology | Qi J.-R.,South China University of Technology | Li K.-K.,South China University of Technology | Yin S.-W.,South China University of Technology | And 3 more authors.
Food Research International | Year: 2012

The conjugation reaction between soy β-conglycinin and dextran via Maillard reaction in crowded liquid system was studied. Apparent viscosity indicated that environment became more and more crowded with the increase of dextran concentration. The covalently linked conjugate was produced by incubating aqueous solution containing soy β-conglycinin and dextran at pH. 7.0 and 95 °C for 6 h. Free amino group content and sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) profile showed that soy β-conglycinin-dextran conjugate was successfully formed and macromolecular crowding enhanced the extent of glycation. The results of atomic force microscopy indicated that glycation inhibited the thermal aggregate of protein. Meanwhile, the tertiary structure of protein in conjugate changed with increasing number of aromatic side-chains exposed in heating environment. All data showed that the introduction of macromolecular crowding in soy β-conglycinin-dextran conjugate was an effective and promising method for linking polysaccharides to proteins. © 2012 Elsevier Ltd.


Liang K.,Shaoguan College | Liu Q.,Hunan University of Science and Technology | Ding Y.,Hunan University of Science and Technology
Polymers and Polymer Composites | Year: 2014

Porous magnetic polymer microspheres (PMPMs) were used as an adsorbent to removal of methyl violet (MV) from wastewater. Ethanol/water co-solvent mixtures in combination with various inorganic salts were used as eluents to regenerate PMPMs. The desorption capacity of the eluents were systematically investigated. The results showed that when ethanol/water co-solvents were used as the eluent, the desorption efficiency increased with the ethanol concentration. Incorporation of inorganic salts into the co-solvents greatly improved the desorption efficiency of the eluents. Among the eluents, a mixture of ethanol/water (8/2, v/v) in combination with 0.1M KCl exhibited excellent ability for recovering cationic dyes and regenerating PMPMs, which was again demonstrated during treatment of wastewater containing cationic golden yellow. Furthermore, the adsorption kinetics of methyl violet by PMPMs was also studied. It was found that the adsorption capacity depended on the initial concentration of dyes, and the pseudo-second-order model was more suitable to describe adsorption kinetics of methyl violet than the pseudo-first-order model. © 2014 Smithers Information Ltd.


Guo J.-B.,Shaoguan college | Xin X.,Shaoguan college | Zhong R.-M.,Shaoguan college | Li X.-P.,Shaoguan college
Advanced Materials Research | Year: 2013

To generate a group-specific monoclonal antibody (McAb) against danofloxacin (DANO), enrofloxacin (ENR) and ciprofloxacin (CIP), glutaraldehyde was used to link the presentative hapten of CIP to the immunogen and coating antigen, respectively, leaving the common structure of these 3 drugs exposed in both conjugates as a major antigenic site. Consequently, a McAb (6D3) with high cross-reactivity to this three antibiotics has been obtained by using hybridomas technique. In a biotin-avidin mediated enzyme-linked immunosorbent assay, the IC50 values for DANO, ENR and CIP were 5.1, 4.5 and 4.2 ng mL-1, respectively. The ELISA was used for the detection of spiked DANO and ENR+CIP in milk. The recoveries ranged from 74.1 to 92.4% and coefficients of variation were in a range of 6.6-11.9%. The accuracies and sensitivity of the method were good for simultaneous analysis of the 3 drugs in milk after a simple sample extraction process. © (2013) Trans Tech Publications, Switzerland.


Qi J.-R.,South China University of Technology | Liao J.-S.,South China Normal University | Yin S.-W.,South China University of Technology | Zhu J.H.,Shaoguan College | Yang X.-Q.,South China University of Technology
International Journal of Food Science and Technology | Year: 2010

The conjugation reaction between soybean acid-precipitated protein (SAPP) and dextran in liquid systems via the initial stage of the Maillard reaction was studied. Functional SAPP-dextran conjugates were prepared in 80% ethanol-reacting system at 50 °C for 6 h, along with 95% ethanol-reacting system at 60 °C for 24 h. The covalent attachment of dextran to SAPP was confirmed by sodium dodecyl sulphate-polyacrylamide gel electrophoresis and gel filtration chromatography.Compared to the classical dry-heating, the reaction time of glycosylation in the two ethanol systems was largely shortened. Emulsifying activity of SAPP-dextran conjugates obtained by dry-heating incubation and in ethanol was similar at pH 7.0 and10.0, significantly higher than that of SAPP-dextran mixture or SAPP alone. In addition, SAPP-dextran conjugates obtained in 80% ethanol-reacting system for 6 h were completely soluble after heating at 90 °C for 20 min. The impact of various processing conditions on the formation of SAPP-dextran conjugates was investigated. This study provides important guidance to create protein-polysaccharide conjugates at mild temperatures in liquid systems. © 2010 The Authors. International Journal of Food Science and Technology © 2010 Institute of Food Science and Technology.


PubMed | Shaoguan College
Type: Journal Article | Journal: Guang pu xue yu guang pu fen xi = Guang pu | Year: 2012

The objective of the present study is to analyze different products of Guilin watermelon frost by Fourier transform infrared spectroscopy (FTIR), second derivative infrared spectroscopy and two-dimensional correlation spectroscopy (2D-IR) under thermal perturbation. The structural information of the samples indicates that samples from the same factory but of different brands had some dissimilarities in the IR spectra, and the type and content of accessories of them were different compared with conventional IR spectra of samples, peaks at 638 and 616 cm(-1) all arise from anhydrous sodium sulfate in watermelon frost spray and watermelon frost capsule; the characteristic absorption peaks of the sucrose, dextrin or other accessories can be seen clearly in the spectra of watermelon frost throat-clearing buccal tablets, watermelon frost throat tablets and watermelon frost lozenge. And the IR spectra of watermelon frost lozenge is very similar to the IR spectra of sucrose, so it can be easily proved that the content of sucrose in watermelon frost lozenge is high. In the 2D-IR correlation spectra, the samples presented the differences in the position, number and relative intensity of autopeaks and correlation peak clusters. Consequently, the macroscopical fingerprint characters of FTIR, second derivative infrared spectra and 2D-IR spectra can not only provide the information about main chemical constituents in medical materials, but also analyze and identify the type and content of accessories in Guilin watermelon frost. In conclusion, the multi-steps IR macro-fingerprint method is rapid, effective, visual and accurate for pharmaceutical research.


PubMed | Shaoguan College
Type: Journal Article | Journal: Guang pu xue yu guang pu fen xi = Guang pu | Year: 2012

In the present paper, the similar spectra of 18 samples, which include Astragalus, red-blue Astragalus and Codonopsis, were obtained in the range of 1600-700 cm(-1). The result showed that all kinds of herbs have their own characteristic similar spectra, and 18 samples can be identified according to the characteristic similar spectra. Furthermore, three correlation coefficients of 93 ganoderma samples were calculated which is in the range of 1560-1502, 1460-1421 and 1319-1260 cm(-1) according to the information of similar spectrum of infrared spectrum of ganoderma. Without priori knowledge of the classification of these samples, the K-means cluster analysis can successfully divide them into four classes, i.e., Ganoderma lucidum and Ganoderma sinensis, Ganoderma atrum, Ganoderma aoshiba, Ganoderma multiplicatum. This result is consistent with the result of morphological classification.

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