Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province

Wenlan, China

Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province

Wenlan, China
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Chen X.,Honghe University | Chen X.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | Chen X.,Fuzhou University | Zhang G.,Honghe University | And 8 more authors.
Materials Science and Engineering C | Year: 2016

The formation of nitrogen-doped (N-doped) graphene uses hydrothermal method with urea as reducing agent and nitrogen source. The surface elemental composition of the catalyst was analyzed through XPS, which showed a high content of a total N species (7.12 at.%), indicative of the effective N-doping, present in the form of pyridinic N, pyrrolic N and graphitic N groups. Moreover, Au nanoparticles deposited on ZnO nanocrystals surface, forming Au/ZnO hybrid nanocatalysts, undergo a super-hydrophobic to super-hydrophilic conversion. Herein, we present Au/ZnO hybrid nanocatalysts impregnated in N-doped graphene sheets through sonication technique of the Au/ZnO/N-doped graphene hybrid nanostructures. The as-prepared Au/ZnO/N-doped graphene hybrid nanostructure modified glassy carbon electrode (Au/ZnO/N-doped graphene/GCE) was first employed for the simultaneous determination of ascorbic acid (AA), dopamine (DA) and acetaminophen (AC). The oxidation over-potentials of AA, DA and AC decreased dramatically, and their oxidation peak currents increased significantly at Au/ZnO/N-doped graphene/GCE compared to those obtained at the N-doped graphene/GCE and bare CCE. The peak separations between AA and DA, DA and AC, and AC and AA are large up to 195, 198 and 393 mV, respectively. The calibration curves for AA, DA and AC were obtained in the range of 30.00-13.00 × 103, 2.00-0.18 × 103 and 5.00-3.10 × 103 μM, respectively. The detection limits (S/N = 3) were 5.00, 0.40 and 0.80 μM for AA, DA and AC, respectively. © 2016 Elsevier B.V. All rights reserved.


Yan H.P.,Honghe University | Yan H.P.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | Huang D.S.,Honghe University | Huang D.S.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | And 5 more authors.
Advanced Materials Research | Year: 2014

Three chalcone derivatives were synthesized by the reaction of acetophenone with dimethylamino benzaldehyde, vanillin, diphenyl formaldehyde, respectively. The results showed that: A yield of 80.4% was obtained by the reaction of acetophenone and dimethylamino benzaldehyde in ethanol as solvent, 10% NaOH solution as catalyst at room temperature. A yield of 25.0% was obtained by the reaction of acetophenone and vanillin in ethanol as solvent, a mixed glacial acetic acid and hydrochloric acid as the catalyst, adding 10% KOH solution for dehydration by heating after the reaction at room temperature. A yield of 76.3% was obtained by the reaction of acetophenone and diphenyl formaldehyde in ethanol as solvent, 10% NaOH solution as catalyst at room temperature. Acid was used as the appropriate catalyst when chalcone derivatives were synthesized by aldehyde with hydroxy. © (2014) Trans Tech Publications, Switzerland.


Gou G.-Z.,Honghe University | Gou G.-Z.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | Yan H.-P.,Honghe University | Yan H.-P.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | And 8 more authors.
Advanced Materials Research | Year: 2014

A 1,8-naphthyridine modified rhodamine B derivative, one Cu2+-selective chemosensors was designed, synthesized and characterized, which display a high selectivity for Cu2+ among environmentally and biologically relevant metal ions. It can detect Cu2+ in aqueous solution selectively with a dramatic colour change from colorless to magenta. The detection mechanism involves a ring-opening process as a consequence of metal complex formation. Job's plots study indicated that the chemosensor chelated Cu2+ with 2:1 stoichiometry. © (2014) Trans Tech Publications, Switzerland.


Feng S.,Honghe University | Feng S.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | Li Z.,Honghe University | Li Z.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | And 5 more authors.
Asian Journal of Chemistry | Year: 2014

The mechanism of extraction of Pd(II) with 2-ethylhexyl benzimidazole sulfide was studied. Experimental results show that the distribution coefficient of Pd(II) was not affected by the H+concentration, but decreased dramatically with the increase of Cl-concentration in hydrochloric acid. PdCl2•2-ethylhexyl benzimidazole sulfide complex has been identified with the infrared spectrum, UV-visible spectrum and slope. The possible mechanism of palladium extraction with 2-ethylhexyl benzimidazole sulfide determined to be neutral coordination. It reveals that 2-ethylhexyl benzimidazole sulfide coordinates with Pd(II) via the benzimidazole N atom and the molar ratio of 2-ethylhexyl benzimidazole sulfide to Pd(II) was 2:1. © 2014, Chemical Publishing Co. All rights reserved.


Gou G.,Honghe University | Gou G.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | Zhou B.,Honghe University | Yan H.,Honghe University | And 4 more authors.
Asian Journal of Chemistry | Year: 2014

Two 1,8-naphthyridine derivatives containing amino acid by amido bond, Boc-L-alanine-2-methy-1,8-naphthyridine (L1) and Boc-L-alanine-2,4-dimethy-1,8-naphthyridine (L2) were synthesized and characterized. And there absorption and fluorescence spectra in various solvents and solid are presented comprehensively. The two ligands exhibit similar electronic absorption spectra with λmax at about 330 nm, which can be tentatively assigned to π→π∗transition. A comprehensive study of spectroscopic properties upon titration of L1, L2 with HBF4 as a proton source in CH3OH was investigated. Compounds L1 and L2 can use as acid-controlled molecular switching on from the luminescence intensity change caused by proton source. © 2014, Chemical Publishing Co. All rights reserved.


Li Z.,Honghe University | Li Z.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | Huang D.,Honghe University | Huang D.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | And 10 more authors.
Current Nanoscience | Year: 2012

Nano-Au/C catalysts were prepared by loading the gold nanoparticles which were prepared by photochemical reduction method to the activated carbon. They were used for the catalytic oxidation reaction of glyoxal into glyoxylic acid. The influence of temperature and pH on the catalytic activity, and the mechanism of Au/C catalyst on catalytic oxidation of glyoxal were discussed. The amount ratio of Au: glyoxal is 1:1000; The pH of solution can be controlled between 8.2 to 8.4 by using 1.00 mol/L NaOH solution under 45°. Activity of the catalyst slowly decreased after 14 runs. © 2012 Bentham Science Publishers.


Huang D.,Honghe University | Huang D.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | Liu W.,Honghe University | Liu W.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | And 5 more authors.
Proceedings - 2012 International Conference on Biomedical Engineering and Biotechnology, iCBEB 2012 | Year: 2012

Mathematical mass transfer model of racemic resolution for chiral compounds using HFSLM was presented in this study. Factors such as transportation resistance of boundary layers in strip phase inside the hollow fiber and in feed phase on the shell side of the hollow fiber module, diffusion resistance in the membrane solution and equilibrium constant of interfacial chemical reactions are considered in this mathematical model. The validity of the model is tested by resolution of D, L-phenylalanine with HFSLM using CuN2 as chiral carrier dissolved in a organic solvent (hexanol:decane, 1:1). Using experimental results, several parameters of the proposed model have been achieved by nonlinear fitting method. © 2012 IEEE.


Huang D.,Honghe University | Huang D.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | Huang Z.,Honghe University | Wu N.,Honghe University | And 4 more authors.
Applied Mechanics and Materials | Year: 2012

L-theanine was extracted by bulk liquid membrane containing Aliquat 336 as a carrier and kerosene as solvent. The effects of theanine initial concentration, carrier concentration and ion concentration in the extracting phase on separation performance were discussed and appropriate extractive conditions were established. © (2012) Trans Tech Publications, Switzerland.


Huang D.,Honghe University | Huang D.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | Min Y.,Honghe University | Yao L.,Honghe University | And 4 more authors.
Applied Mechanics and Materials | Year: 2012

This paper deals with the partittion-diffusion model of transport and enantioseparation of phenylalanine across hollow fiber supported liquid membranes. Observed partition coefficient between the feed phase and the membrane phase, the stripping phase and the membrane phase, mass transfer resistance of boundary layer in strip phase inside the hollow fibers, boundary layer in feed phase and the diffusion in the membrane phase are taken into account in the model equations. © (2012) Trans Tech Publications, Switzerland.


Huang D.,Honghe University | Huang D.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | Liu W.,Honghe University | Liu W.,Key Laboratory of Natural Pharmaceutical and Chemical Biology of Yunnan Province | And 4 more authors.
Proceedings - 2012 International Conference on Biomedical Engineering and Biotechnology, iCBEB 2012 | Year: 2012

This paper deals with the enantioseparation of racemic propranolol containing S, S-di-n-dodecylltartrate as a chiral carrier using hollow fiber membrane contactor (HFMC). A mathematical mass transfer model of enantioseparation process for chiral compounds was deduced, factors such as the observed partition coefficient between the feed phase and the hollow fibers, the stripping phase and the hollow fiber module, transportation resistance of boundary layers in the stripping phase and the feed phase, the diffusion resistance in the membrane phase are considered in this mathematical mass transfer model. © 2012 IEEE.

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