Selective detection of uric acid in the presence of ascorbic acid at physiological pH by using a beta-cyclodextrin modified copolymer of sulfanilic acid and N-acetylaniline.
A beta-cyclodextrin (CD) modified copolymer membrane of sulfanilic acid (p-ASA) and N-acetylaniline (SPNAANI) on glassy carbon electrode (GCE) was prepared and used to determine uric acid (UA) in the presence of a large excess of ascorbic acid (AA) by differential pulse voltammetry (DPV). The properties of the copolymer were characterized by X-ray photoelectron spectra (XPS) and Raman spectroscopy. The oxidation peaks of AA and UA were well separated at the composite membrane modified electrode in phosphate buffer solution (PBS, pH 7.4). A linear relationship between the peak current and the concentration of UA was obtained in the range from 1.0 x 10(-5) to 3.5 x 10(-4)mol L(-1), and the detection limit was 2.7 x 10(-6)mol L(-1) at a signal-to-noise ratio of 3. Two hundred and fifty-fold excess of AA did not interfere with the determination of UA. The application of the prepared electrode was demonstrated by measuring UA in human serum samples without any pretreatment, and the results were comparatively in agreement with the spectrometric clinical assay method.
Wu
Shouguo
S
Department of Chemistry, University of Science and Technology of China, Hefei 230026, China. sgwu@ustc.edu.cn
Wang
Taoling
T
Gao
Zongyong
Z
Xu
Haihong
H
Zhou
Baineng
B
Wang
Chuanqin
C
D000409:Alanine / Q000031:analogs & derivatives* / Q000737:chemistry; D001205:Ascorbic Acid / Q000737:chemistry*; D015374:Biosensing Techniques / Q000295:instrumentation*; D045424:Complex Mixtures / Q000032:analysis / Q000737:chemistry; D004563:Electrochemistry / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006863:Hydrogen-Ion Concentration; D012680:Sensitivity and Specificity; D013425:Sulfanilic Acids / Q000737:chemistry*; D014527:Uric Acid / Q000032:analysis* / Q000737:chemistry*
D045424:Complex Mixtures; D013425:Sulfanilic Acids; D014527:Uric Acid; C010530:N-acetylalanine; D000409:Alanine; D001205:Ascorbic Acid