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Electrochemical Behavior of Guanine and Its Determination by Differential Pulse Adsorption Stripping Voltammetry

✍ Scribed by X.X. Sun; Y.M. Chi; H.Y. Chen

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
431 KB
Volume
47
Category
Article
ISSN
0026-265X

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✦ Synopsis

A sensitive method for the determination of nanomolar concentrations of guanine in a medium of (0.02 M \mathrm{NaHCO}{3}-0.06 M \mathrm{Na}{2} \mathrm{SO}_{4}) by differential pulse adsorption cathodic stripping voltammetry has been developed. The limit of detection is (3 \times 10^{-10} \mathrm{M}) guanine. In the presence of 10 -fold guanosine (at a concentration of (2 \times 10^{-7} \mathrm{M}) ) ca. (2 \times 10^{-9} \mathrm{M}) guanine can be detected. By means of cyclic voltammetry and other electrochemical methods, a new viewpoint on the mechanism of the overall electrode process for guanine at a hanging mercury drop electrode in the potential range of -1.0 to (+0.2 \mathrm{~V}) (vs SCE), including two separate steps, has been proposed. 1993 Academic Press, Inc.

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