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- W1973603791 abstract "Abstract In this paper, a pre-anodized inlaying ultrathin carbon paste electrode with 316L stainless steel as a matrix (316L-PAIUCPE) was constructed by a simple and fast electrochemical method. Taking uric acid (UA) and guanine (G) as the target compounds, it was discussed in detail to illustrate the dependent of the peak currents intensity of ( i p ) of UA and G upon the pH on the basis of the charge properties of the electrode surface active groups, the formation and catalysis of hydrogen bond, the molecular configuration of target, the degree of oxygen reduction reaction at the auxiliary electrode, the oxidation peak potential, distribution coefficient of both UA and G, and so on . A new mechanism was proposed that decreasing of the i p of UA and G with the increasing of pH might result from the degree of oxygen reduction reaction at the auxiliary electrode, although the oxidation peak potential shifted negatively. Moreover, In pH = 5.00 phosphate buffer solution, a linear relationship between oxidation peak current and concentration of UA and G was obtained in the range of 5.0 × 10 −7 to 2.2 × 10 −4 mol·L −1 and 2.0 × 10 −7 to 1.5 × 10 −4 mol·L −1 with a detection limit of 8.2 × 10 −8 and 3.4 × 10 −8 mol·L −1 , respectively. The constructed electrode exhibited excellent reproducibility and stability. Finally, this technique was employed for simultaneous determination of UA and G in human urine with satisfactory results." @default.
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- W1973603791 date "2014-08-01" @default.
- W1973603791 modified "2023-10-13" @default.
- W1973603791 title "The influencing mechanism of acidity on the oxidation peak currents of guanine and uric acid: hydrogen bond catalysis and degree of auxiliary electrode reduction reaction" @default.
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- W1973603791 doi "https://doi.org/10.1016/j.electacta.2014.05.132" @default.
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