Modified screen-printed electrodes for the investigation of the interaction of non-electroactive quinazoline derivatives with DNA |
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Authors: | Labuda J Bucková M Jantová S Stepánek I Surugiu I Danielsson B Mascini M |
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Institution: | Department of Analytical Chemistry, Slovak Technical University, Bratislava. labuda@chtf.stuba.sk |
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Abstract: | Five morpholino-quinazoline derivatives have been investigated voltammetrically using a competition with the tris(o-phenanthroline) cobalt(III) redox marker for the accumulation at dsDNA modified screen-printed electrodes. An association of quinazolines with DNA was observed at the modified electrodes polarized by the negative potential of -0.4 V vs. Ag/AgCl. This was confirmed by a potentiometric stripping analysis based on the DNA guanine signal. Calibration curves for quinazolines within a concentration range of micromol/L were obtained with DP voltammetry using 5 x 10(-7) mol/L Co(phen)3(3+) marker. The quinazolines exhibit no effect on the DNA complex with the fluorescent thiazole orange derivative TO-PRO-3. The role of the accumulation potential in the association interaction with DNA is discussed. |
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