Abstract
Deoxyribonucleic acid (DNA) can form G-quadruplexes in the presence of certain metal ions. These play a functional role in a variety of biological process. A DNA 17-mer (PW17) was previously reported to bind hemin in the presence of excess potassium ion. The resulting stabilized G-quadruplex-hemin complex exhibits peroxidase-like activity. However, this activity is lost in the presence of one equivalent of Pb2+ ion. We exploit this property in a method for spectrophotometric detection of Pb2+. Inhibition by Pb2+ ion is reflected by a change in the Soret band of hemin and a sharp reduction in the catalytic activity towards hydrogen peroxide-mediated chromogenic oxidation of 2,2′-azino-bis(3-ethylbenzothiazoline)-6-sulfonate. The new method enables Pb2+ to be detected in the concentration range from 0.05 to 1.2 μM, with a detection limit of 27 nM. The assay shows high selectivity over other metal ions. It was successfully used to determine Pb2+ in water samples.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 20890022), the National Key Basic Research Development Project of China (No. 2010CB933602) and the Project of Chinese Academy of Sciences (No.KJCX2-YW-H09).
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Wang, Y., Wang, J., Yang, F. et al. Spectrophotometric detection of lead(II) ion using unimolecular peroxidase-like deoxyribozyme. Microchim Acta 171, 195–201 (2010). https://doi.org/10.1007/s00604-010-0418-x
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DOI: https://doi.org/10.1007/s00604-010-0418-x