Abstract
An aptamer based method is described for the determination of 8-hydroxy-2′-deoxyguanosine (8-OHdG) using resonance light scattering (RLS). Magnetic nanoparticles (MNPs) were employed as RLS probes. The probe DNA was placed on the surface of MNPs, which produces a rather low RLS signal. If, however, probe DNA hybridizes with the aptamer against 8-OHdG, a sandwich structure will be formed. This results in a significant enhancement of RLS intensity. The aptamer was used as the recognition element to capture 8-OHdG. 8-OHdG has a stronger affinity for the aptamer than probe DNA, and the conformation of the aptamer therefore switches from a double-stranded to a G-quadruplex structure. As a result, MNPs labeled with probe DNA are released, and RLS intensity decreases. The method allows 8-OHdG to be detected with a linear response in the 32 pM − 12.0 nM concentration range and an 11 pM limit of detection (at 3.29SB/m, according to the recent recommendation of IUPAC). The MNPs can be reused 5 times by applying an external magnetic field for collection. The method was successfully applied to analyze human urine samples for its content of 8-OHdG. It was also found that the levels of 8-OHdG noticeably increased with the increase of the Air Quality Index. Conceivably, the method is a viable tool to investigate the relationship between 8-OHdG levels and the effect of air pollution.
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Acknowledgments
This work was financially supported by the Natural Science Foundation of China (91543206), the Natural Science Foundation (ZR2014BQ017, ZR2015BM024, and 2013SJGZ07) and the Tai-Shan Scholar Research Fund of Shandong Province and research foundation of Liaocheng University.
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Tao, L., Yue, Q., Hou, Y. et al. Resonance light scattering aptasensor for urinary 8-hydroxy-2′-deoxyguanosine based on magnetic nanoparticles: a preliminary study of oxidative stress association with air pollution. Microchim Acta 185, 419 (2018). https://doi.org/10.1007/s00604-018-2937-9
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DOI: https://doi.org/10.1007/s00604-018-2937-9