Longnan Normal College

Chengxian Chengguanzhen, China

Longnan Normal College

Chengxian Chengguanzhen, China
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Zuo G.,Tianshui Normal University | Wang P.,Tianshui Normal University | Li Z.,Tianshui Normal University | Yang J.,Longnan Normal College
Journal of New Materials for Electrochemical Systems | Year: 2016

In this paper, copper phthalocyanine/reduced graphene oxide (CuPc/RGO) nanocomposites were synthesized by aromatic π-π stacking interaction and well characterized by scanning electron microscopy (SEM) and fluorescence spectrometry. The composites were modified on the surface of glass carbon electrode (GCE) and their electrochemical behaviors of CuPc/RGO for electrocatalytic oxygen reduction reaction (ORR) were studied by cyclic voltammetry (CV). The study showed when the mass ratio of RGO to CuPc in composite achieved 1:1, the composite film performed excellent electrocatalytic activity towards the ORR. © J. New Mat. Electrochem. Systems.

Zhang X.-P.,Gansu College of Traditional Chinese Medicine | Cui W.-H.,Longnan Normal College
Immunological Investigations | Year: 2012

It is of fundamental importance to use an appropriate adjuvant to generate a potent immune response for immunotherapy. In this study, we had a comparative investigation on the effectiveness of two adjuvant formulations, liposome-polycation-DNA (LPD) and monophosphoryl lipid A(MPL) in combination with a truncated peptide of bFGF(tbFGF) as antigen. LPD/tbFGF induced continuously increasing antibodies expression during the whole immunization period. In contrast, the level of antibodies was variable in MPL/tbFGF-immunized mice, MPL/tbFGF elicited potent antibodies response in the early-phase of immunization (during the first 3 immunizations), but the later immunizations did not produce a significant increase in the level of antibodies. Evaluation of IFN-γ and IL-4 responses revealed that both LPD/tbFGF and MPL/tbFGF demonstrated generation of higher level of IFN-γ, whereas no significant increase in IL-4 levels was detected in the two groups. In addition, histological analysis exhibited obvious germinal centers in the spleen tissues of LPD/tbFGF mice. The data suggested that LPD would be a promising long-effective adjuvant due to its potent and persistent immunostimulation and MPL could play an appropriate role in short-acting immunization. Copyright © Informa Healthcare USA, Inc.

Yang D.,Anhui Agricultural University | Yang D.,Longnan Normal College | Liang J.,Anhui Agricultural University | Wang Y.,Anhui Agricultural University | And 7 more authors.
Journal of the Science of Food and Agriculture | Year: 2016

BACKGROUND: Tea waste is the residue that remains after tea leaves have been extracted by hot water to obtain water-soluble components. The waste contains a re-usable energy substrate and nutrients which may pollute the environment if they are not dealt with appropriately. Other agricultural wastes have been widely studied as substrates for cultivating mushrooms. In the present study, we cultivated oyster mushroom using tea waste as substrate. To study the feasibility of re-using it, tea waste was added to the substrate at different ratios in different experimental groups. Three mushroom strains (39, 71 and YOU) were compared and evaluated. Mycelia growth rate, yield, biological efficiency and growth duration were measured. RESULTS: Substrates with different tea waste ratios showed different growth and yield performance. The substrate containing 40-60% of tea waste resulted in the highest yield. CONCLUSION: Tea waste could be used as an effective and economic substrate for oyster mushroom cultivation. This study also provided a useful way of dealing with massive amounts of tea waste. © 2015 Society of Chemical Industry.

Zuo G.,Tianshui Normal University | Wang Q.,Lanzhou Jiaotong University | Li Z.,Tianshui Normal University | Yang J.,Longnan Normal College | Wang P.,Tianshui Normal University
International Journal of Electrochemical Science | Year: 2015

In this paper, cobalt porphyrin combining with reduced graphene oxide (RGO) through an aromatic π-π stacking interaction made up a cobalt meso-tetraphenylprophyrin-RGO (CoTPP/RGO) nanocomposite. This composite was well characterized by scanning electron microscopy (SEM), fluorescence and UV-vis spectrometry. The electrochemical behavior of CoTPP/RGO for electrocatalytic dioxygen reduction was studied on the surface of glass carbon electrode (GCE) modified with the composite by cyclic voltammetry (CVs). When the mass ratio of RGO to CoTPP is 1:1 in the composite, CoTPP/RGO film displayed superb electroreduction of oxygen. © 2015 The Authors.

Zuo G.,Tianshui Normal University | Wang Q.,Lanzhou Jiaotong University | Li Z.,Tianshui Normal University | Yang J.,Longnan Normal College | Wang P.,Tianshui Normal University
Sensor Letters | Year: 2016

A new type of water-soluble sulfonated copper (II) phthalocyanine (CuTsPc)-functionalized reduced graphene oxide (RGO) nanocomposite was synthesized and used for highly selective and sensitive detection of dopamine. The aromatic - stacking and electrostatic attraction between positivelycharged dopamine and negatively-charged CuTsPc-modified RGO can accelerate the electron transfer whereas weakening ascorbic acid oxidation on the CuTsPc-functionalized graphenemodified electrode. The cyclic voltammetry was used for electrochemical determining DA in the presence of large excess of ascorbic acid with good sensitivity and selectivity, which provides a superior platform for the biological analysis. Copyright © 2016 American Scientific Publishers All rights reserved.

Wang D.,Longnan Normal College | Yang J.,Longnan Normal College | Yang S.,Lanzhou University | Guo J.,Lanzhou University
Acta Chimica Sinica | Year: 2013

Magnetic separation has been proved to be superior to the traditional column separation or filtration especially when nanosized adsorbents are used. In this work, iron phosphate coated nano-Fe3O4 particles (Fe3O4@FePO4) were synthesized in aqueous solution through deposition of Fe(III) and phosphate ions onto the superparamagnetic nano-Fe3O4 particles that were prepared by coprecipitation. The synthesized nano-particles were applied to the enrichment of trace amounts of Cr(III) for its determination by graphite furnace atomic absorption spectrometry (GF-AAS). The magnetic property and morphology of Fe3O4@FePO4 were characterized by vibrating sample magnetometer (VSM), scanning electron microscope (SEM), transmission electron microscope (TEM). The results indicated that the adsorbent was superparamagnetic. Its saturated intensity of magnetization was 23.0 emu·g-1. This value implied that the prepared Fe3O4@FePO4 could be efficiently separated from the solutions by magnetic fields. The diameters of the particles evaluated from TEM images were in a range of 2~9 nm, which were consistent with that obtained from dynamic light scattering. X-ray photoelectron spectroscopy (XPS) and Zeta potential measurement were used for determining the composition and surface charge of the adsorbent. Based on XPS results, the amount of FePO4 in Fe3O4@FePO4 was 33.8%. Cr was found in Fe3O4@FePO4 after Cr adsorption. Zeta potential measurement indicated that the surface of Fe3O4@FePO4 carried positive charge at pH<4 and negative charge at pH>4. The influence of pH, adsorption time and sample volume on the rate of adsorption were systematically investigated. At pH 5.3, 0.0200 g of Fe3O4@FePO4 could quantitatively adsorb Cr(III) from 20.0 mL of sample within 20 min. Freundlich isotherm and pseudo second order adsorption kinetics were observed. Adsorbed Cr(III) could be desorbed with 0.3 mol·L-1 NH3-1% (V/V) H2O2 for direct GF-AAS analysis. The adsorbent was also used for the enrichment of Cr(III) from large volume samples. After stirring for 2 h, more than 80% of Cr(III) in 800 mL (0.5 μg·L-1) of aqueous solution could be adsorbed and an enrichment factor of 1125 was attained, which confirmed its suitability for the analysis of trace amounts of Cr(III). The adsorbent was successfully used for the real sample analysis and could be re-used 10 times after proper washing and drying. © 2013 Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences.

Yang J.D.,Longnan Normal College | Yang J.D.,Northwest Normal University | Lu X.Q.,Northwest Normal University
Chinese Chemical Letters | Year: 2012

Self-assembled monolayers (SAMs) of thiol-derivatized porphyrin molecules on Au substrate have attracted extensively interest for use in sensing, optoelectronic devices and molecular electronics. In this paper, tetra-[p-(3-mercaptopropyloxy)-phenyl]-porphyrin was synthesized and self-assembled with thiol on Au substrate for porphyrin SAMs (PPS 4). The electrochemical results demonstrated that PPS 4 could form excellent SAMs on gold surface. Self-assembled nanojunctions of PPS 4 were fabricated by using gold nanogap electrodes (gap width: ca. 100 nm). With the light on/off, the nanojunctions showed current high/low as nanometer scaled photo switch. © 2012 Jian Dong Yang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

Cui W.,Longnan Normal College | Cui W.,Northwest Normal University | Zhang Y.,Northwest Normal University | Jia R.,Longnan Normal College | And 2 more authors.
Chinese Journal of Organic Chemistry | Year: 2015

Three new Brøsted-acidic task-specfic ionic liquids (TSILS) that bear two butane sulfonic acid groups based on 1-(morpholinyl-4-yl)-3-(imidazolyl-1-yl)propane (mip) heternuclear dication: 1-[4-(4-sulfobutyl)morpholinium-4-yl]-3-[3-(4- sulfobutyl)-1H-imidazolium-1-yl]propane bis(trifluoromethane sulfonate) {A, [(C4SO3H)m(C4SO3H)i]p(OTf)2}, 1-[4-(sul- fobutyl)morpholinium-4-yl]-3-[3-(4-sulfobutyl)-1H-imidazolium-1-yl]propane bis(hydrogen sulfate) {B, [(C4SO3H)m(C4SO3- H)i]p(HSO4)2} and 1-[4-(4-sulfobutyl)morpholinium-4-yl]-3-[3-(4-sulfobutyl)-1H-imidazolium-1-yl]propane bis(bihydrogen phosphate) {C, [(C4SO3H)m(C4SO3H)i]p(H2PO4)2} were synthesized and characterized by NMR and FT-IR. The imidazolium-based and morpholinium-based single-SO3H functionalized acidic ionic liquids were used for comparison. Their catalytic activities were investigated in crossed-aldol condensation between cycloalkanone and various aromatic aldehydes. Hammett method has been used to determine the acidity order of these ionic liquids (ILs). The experiment results have shown that the catalytic activities of the three bi-SO3H-functionalized ILs were stronger than those of single SO3H functionalized ILs. Their acidity orders were consistent with their catalytic activities. Good adaptability to the reaction substrate and maximum product yield of 90% was observed when [(C4SO3H)m(C4SO3H)i]p(OTf)2 was used as catalyst and the catalyst can be reused at least ten times without obvious activity loss. © 2015 Chinese Chemical Society & SIOC, CAS

Ye W.-B.,Longnan Normal College | Fan L.,Longnan Normal College
Modern Food Science and Technology | Year: 2013

In this study, the preservation effects of a compound coating of polysaccharide on Prunus avium L. at room temperature (25~28°C) and relative humidity (68~75%) were investigated. The antistaling agent was made using Sophoraalopecuroides bean galactomannan as the coating matrix. CaCl2 and citric acid were used as film-forming additives and glycerin was added to improve the film flexibility. The results showed that the use of the compound coating obviously lowered the rotten rate, cracking fruit rate and weightloss rates of Prunus avium L. preserved, inhibited the respiration rate and the loss of total Vc and organic acids and other nutrients. The contents of MDA and anthocyanin, as well as the relative conductivity, were effectively increased, thus resulting in lower PPO and POD enzyme activities. Use of the compound coating of Sophoraalopecuroides bean galactomannan may delay the senescence process during storage and extending the shelf life.

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