Abstract
Quercetin and rutin as well as catechin and epigallocatechin gallate were investigated, as widely distributed representatives of flavonols and flavanols, respectively, regarding their anti/pro-oxidant properties. The flavonoids are irreversibly oxidized at a dsDNA-modified screen-printed electrode within 0.368 to 0.449 V vs. SHE without binding to DNA. Using the DNA biosensor the detection scheme of a DNA prevention/degradation exploits the [Co(phen)3]3+ complex as an electrochemical DNA marker. Antioxidant activity of flavonoids was tested in a model cleavage mixture composed of 5×10−7 mol L−1 [Cu(phen)2]2+ as the catalyst, 1×10−3 mol L−1 ascorbic acid as the chemical reductant and atmospheric oxygen as the natural oxidant where reactive oxygen radicals are generated. The antioxidant activity increases with the concentration of flavonoids reaching a maximum where pro-oxidative behaviour becomes of importance. The pro-oxidant potency of flavonoids depends on the presence of atmospheric oxygen and follows the order quercetin>rutin>epigallocatechin gallate>catechin.
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Acknowledgement
This work was supported by the Grant Agency VEGA of the Slovak Republic (Grant No. 1/9253/02) and by the Ministry of Agriculture of the Slovak Republic (Project No. 27-26 /99). The authors thank R. Nemcová and Z. Siváková for their technical assistance.
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Labuda, J., Bučková, M., Heilerová, Ľ. et al. Evaluation of the redox properties and anti/pro-oxidant effects of selected flavonoids by means of a DNA-based electrochemical biosensor. Anal Bioanal Chem 376, 168–173 (2003). https://doi.org/10.1007/s00216-003-1884-3
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DOI: https://doi.org/10.1007/s00216-003-1884-3