Abstract
We have developed a simple procedure to evaluate the power of antioxidants. It is based on the detection of DNA damage by using an electrochemical biosensor. The latter was fabricated by immobilization DNA on a glassy carbon electrode. DNA damage is caused by the generation of hydroxy radicals in the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate via a Fenton-type reaction. The ionic liquid provides a benign environment for the investigation of the free radicals. The effect of antioxidants on the oxidative damage of DNA can be monitored by the indicator Co(bpy) 3+3 , which binds to the intact DNA much more strongly than to damaged DNA. Ascorbic acid, rutin and aloe-emodin exhibited an inhibitory effect on the damage, and their antioxidative mechanisms were studied. It is also found that catalase displays a protective function against DNA damage by decomposing hydrogen peroxide.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 20875023) and the Foundation for Innovative Research Groups of the Education Department of Hubei Province (No. T201101).
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Xiong, H., Wang, Y., Zhang, X. et al. Evaluation of antioxidative capacity via measurement of the damage of DNA using an electrochemical biosensor and an ionic liquid solvent. Microchim Acta 176, 479–484 (2012). https://doi.org/10.1007/s00604-011-0739-4
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DOI: https://doi.org/10.1007/s00604-011-0739-4