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Electrochemical Studies of the Interaction of 9,10-Anthraquinone with DNA

✍ Scribed by Zhiwei Zhu; Nan-Qiang Li

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
211 KB
Volume
59
Category
Article
ISSN
0026-265X

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✦ Synopsis

The electrochemical behavior of DNA at a glassy carbon electrode modified by 9,10anthraquinone was studied. The cyclic voltammogram of 9,10-anthraquinone CME in 0.10 mol/liter B-R buffer of pH 5.7 exhibits a redox wave at Οͺ0.48 V (vs SCE). On the addition of DNA in solution, both reduction and oxidation currents decrease, but with no change in the peak potentials. It is found that the decrease of reduction current is proportional to the concentration of DNA over the range from 5.0 Ο« 10 Οͺ7 to 8.0 Ο« 10 Οͺ6 mol/liter with a correlation coefficient of 0.9963. But in the B-R buffer at pH 8.9, the redox wave of anthraquinone CME shifts to Οͺ0.68 V, and the voltammogram obtained upon addition of DNA shows an increase in both reduction and oxidation currents. The CME modified by anthraquinone shows significant two-way electrocatalytic activity on DNA.

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