Integrating a DNA Strand Displacement Reaction with a Whispering Gallery Mode 
Sensor for Label-Free Mercury (II) Ion Detection

Wu, Fengchi; Wu, Yuqiang; Niu, Zhongwei; Vollmer, Frank

doi:10.3390/s16081197

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Integrating a DNA Strand Displacement Reaction with a Whispering Gallery Mode Sensor for Label-Free Mercury (II) Ion Detection

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Wu, Fengchi
Vollmer Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Vollmer, Frank
Vollmer Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Wu, F., Wu, Y., Niu, Z., & Vollmer, F. (2016). Integrating a DNA Strand Displacement Reaction with a Whispering Gallery Mode Sensor for Label-Free Mercury (II) Ion Detection. SENSORS, 16(8): 1197. doi:10.3390/s16081197.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-629B-C

Abstract

Mercury is an extremely toxic chemical pollutant of our environment. It has attracted the world's attention due to its high mobility and the ease with which it accumulates in organisms. Sensitive devices and methods specific for detecting mercury ions are, hence, in great need. Here, we have integrated a DNA strand displacement reaction with a whispering gallery mode (WGM) sensor for demonstrating the detection of Hg2+ ions. Our approach relies on the displacement of a DNA hairpin structure, which forms after the binding of mercury ions to an aptamer DNA sequence. The strand displacement reaction of the DNA aptamer provides highly specific and quantitative means for determining the mercury ion concentration on a label-free WGM sensor platform. Our approach also shows the possibility for manipulating the kinetics of a strand displacement reaction with specific ionic species.