University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Changqing Sun

Abbrev:
Sun, C.Q.
Other Names:
Address:
Department of Chemistry, Jilin University, Changchun 130023, China
Phone:
NA
Fax:
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Citations 2

"Fabrication Of Multilayer Films Containing 1:12 Phosphomolybidic Anions On The Surface Of A Gold Electrode Based On Electrostatic Interaction And Its Application As An Electrochemical Detector In Flow Injection Amperometric Detection Of Hydrogen Peroxide"
J. Electroanal. Chem. 1997 Volume 435, Issue 1-2 Pages 63-68
Changqing Sun*, Jinghong Zhao, Hongding Xu, Yipeng Sun, Xi Zhang and Jiacong Shen

Abstract: Novel multilayer films containing 1:12 phosphomolybdic anions were achieved on the surface of a gold electrode by alternating deposition of 1:12 phosphomolybdic anion with water-soluble polypyrrole. The chemically-modified electrode (CME) was shown to exhibit an electrocatalytic response for the reduction of hydrogen peroxide. Hydrogen peroxide was detected by flow-injection analysis at the modified electrode with high sensitivity. The method gave a linear range from 1 x 10^-2 mol l-1 to 1 x 10^-5 mol 1-1 and a detection limit of 1 x 10^-6 mol 1-1 (signal-to-noise ratio 3).
Hydrogen peroxide Electrochemical analysis Electrode Electrode Amperometry

"Electrocatalytic Oxidation Of Carbohydrates At A Molecular Deposition Film Electrode Based On Water-soluble Cobalt Phthalocyanine And Its Application To Flow-through Detection"
J. Electroanal. Chem. 1996 Volume 411, Issue 1-2 Pages 73-78
Sun Changqing*, Zhang Xiaoyuan, Jiang Dan, Gao Qian, Xu Hongding, Sun Yipeng, Zhang Xi and Shen Jiacong

Abstract: An Au-foil or -wire electrode was treated successively with 3-mercaptopropionic acid, a bipolar pyridine salt (cf. Zhang et al., J. Chem. Soc., Chem. Commun., 1994, 1055) and Co-phthalocyaninetetrasulfonic acid tetrasodium salt, the latter two steps being repeated cyclically so that a multilayer film was obtained. The resulting electrode showed an oxidative electrocatalytic response to carbohydrates. Under flow injection conditions at an applied potential of +0.25 V vs. SCE in a carrier stream of 0.15 M NaOH (1 ml/min) with a 30 µL injection loop the linear ranges for glucose and fructose were 5 µM-0.2 mM with detection limits of 150 pmol and for maltose and sucrose were 20 µM to 2 mM with detection limits of 600 pmol.
Carbohydrates Voltammetry Electrode