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Your search keyword '"Hu, Xiaoya"' showing total 28 results
Start Over Author "Hu, Xiaoya" Publisher springer science and business media llc
28 results on '"Hu, Xiaoya"'

8. Sodium dodecyl sulfate sensitized electrochemical method for sub-picomole level determination of topotecan hydrochloride at a novel disposable electrode

Author

Li Jing, Xu Qin, Yang Zhanjun, Hu Xiaoya, and Li Hongbo

Subjects
Detection limit, Topotecan Hydrochloride, chemistry.chemical_compound, Chromatography, endocrine system diseases, Chemistry, Reagent, Electrode, Peak current, General Chemistry, Sodium dodecyl sulfate, Electrochemistry, Graphite electrode
Abstract

A sub-picomole level topotecan hydrochloride determination method was first proposed using sodium dodecyl sulfate (SDS) as a sensitized reagent at a novel disposable electrode (an improved wax-impregnated graphite electrode). The effects of different kinds of surfactants on the electrochemical response to topotecan hydrochloride were examined. The results indicate the electrochemical signal was apparently improved by SDS. At optimal conditions, the oxidative peak current increased linearly with the logarithm of concentrations for topotecan hydrochloride in the ranges of 2.0 × 10−12 to 1.0 × 10−11 mol/L and 8.0 × 10−11 to 8.0 × 10−10 mol/L with a detection limit of 6.4 × 10−13 mol/L. The proposed method could be applied in determining topotecan hydrochloride in urine.

Published
2010

10. A new method of preparing alkanethiol-protected gold nanoparticals

Author

Hu Xiaoya, Xu Qin, and Guo Rong

Subjects
Sodium borohydride, chemistry.chemical_compound, Aqueous solution, Materials science, chemistry, Inorganic chemistry, Monolayer, General Materials Science, Electrolyte, Fourier transform infrared spectroscopy, Solubility, Electrochemistry, Tetrahydrofuran
Abstract

In a new two-phase system (tetrahydrofuran/saturated NaCl aqueous solution) monolayer protected clusters (MPCs) were prepared. The AuCl4− anion in saturated electrolyte aqueous solution was transferred into the organic phase of tetrahydrofuran by tetra-n-butylammonium bromide ((C4H9)4NBr) and was reduced quickly by sodium borohydride in the presence of alkanethiol. The functionalized MPCs were characterized by solubility, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), energy-dispersive X-ray (EDX) analysis and UV-vis spectroscopy. Electrochemical measurements of MPCs in CH2 Cl2 exhibited 7 pairs of reversible voltammetric waves within the potential range of −1.0 to 1.0V (vs Ag/AgCl), which was ascribed to the quantized capacitance charging of nanoparticle double layers. All the results show that the new preparing method is feasible.

Published
2003

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