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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. Source


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. Source


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. Source


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. Source


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. Source

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