The Influencing of Preanodized Inlaying Ultrathin Carbon Paste Electrode on the Oxidation for the Xanthine and Hypoxanthine by the Hydrogen Bond

Publisher： John Wiley & Sons Inc

E-ISSN： 2192-6549|62|11|1011-1019

ISSN： 0009-4536

Source： JOURNAL OF THE CHINESE CHEMICAL SOCIETY (ELECTRONIC), Vol.62, Iss.11, 2015-11, pp. : 1011-1019

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Abstract

AbstractIn this paper, a pre‐anodized inlaying ultrathin carbon paste electrode (PAIUCPE) with 316L as a matrix was constructed by a simple and fast electrochemical pretreatment. Using xanthine (Xa) and hypoxanthine (HXa) as the target compounds, the pH effects compositions of buffer solution, the accumulation times, hydrogen bond catalysis, degree of auxiliary electrode reaction on the size of peak currents (Ip) of Xa and HXa was discussed in detail. Also, it was proposed that Xa and HXa were respectively absorbed at the surface of PAIUCPE through hydrogen bonding. The influencing mechanisms of the PAIUCEP on electrochemical oxidation of Xa and HXa were explained in detail. Moreover, the linear relationships for the Xa and HXa were obtained in the range of 6×10−8–3×10−5 mol/L and 2×10−7–7×10−5 mol/L, respectively. The detection limits for the Xa and HXa were 1.2×10−8 mol/L and 5.7×10−8 mol/L, respectively. Moreover, this proposed method could be applied to determine the Xa and HXa in human urine simultaneously with satisfactory results.