Abstract
Herein is reported a simple and label-free fluorescent detection method for hemin based on using protoporphyrin IX (PPIX) as a fluorescent signal reporter. PPIX emits weak fluorescence in an aqueous solution. When PPIX binds to G-quadruplexes, the fluorescence intensity of PPIX is greatly increased. While in the presence of target hemin, hemin competes with PPIX toward G-quadruplexes because its affinity to G-quadruplexes is higher than that of PPIX. With the formation of the hemin-G-quadruplex complex, PPIX is released to the solution from the G-quadruplex accompanied by quenching of the fluorescence of the system. This fluorescence change of the system can be used to monitor hemin with a low detection limit of 36 nM. In addition, the possible binding sites for PPIX binding to the G-quadruplex are discussed based on competition between hemin and PPIX. What is more, this method might pave the way for applying G-quadruplexes and PPIX to more sensing systems.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (No. 21273174) and the Municipal National Science Foundation of Chongqing City (No. CSTC-2013jjB00002, CSTC-2015jcyjB50001).
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Kang, B.H., Li, N., Liu, S.G. et al. A Label-free, Highly Sensitive and Selective Detection of Hemin Based on the Competition between Hemin and Protoporphyrin IX Binding to G-Quadruplexes. ANAL. SCI. 32, 887–892 (2016). https://doi.org/10.2116/analsci.32.887
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DOI: https://doi.org/10.2116/analsci.32.887