Glutathione-Capped Gold Nanoparticles-Based Photoacoustic Sensor for Label-Free Detection of Lead Ions

SHI Ruyi; LIU Xiangjiang

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Glutathione-Capped Gold Nanoparticles-Based Photoacoustic Sensor for Label-Free Detection of Lead Ions

SHI Ruyi,LIU Xiangjiang *

College of biosystems engineering and food science, Zhejiang University, Hangzhou 310058

*Correspondence author

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Funding: Specialized Research Fund for the Doctoral Program of Higher Education （No.No. 20130101120148）, Natural Sciences Fund of Zhejiang Province （No.LY14B050004）, National Natural Science Foundation of China （No.No. 21305125）, Zhejiang Provincial Public Welfare Technology Applied Research Project （No.No. 2016C32006）

Opened online:24 April 2017

Accepted by: none

Citation: SHI Ruyi,LIU Xiangjiang.Glutathione-Capped Gold Nanoparticles-Based Photoacoustic Sensor for Label-Free Detection of Lead Ions[OL]. [24 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4725588

The photoacoustic signal generated by laser-induced nanobubbles (PA-LINB) proved to be a sensitive tool to monitor aggregation of gold nanoparticles. Here, a simple and label-free photoacoustic method for the rapid detection of Pb2+ in aqueous phase was developed. Due to the high affinity of Pb2+ ions to glutathione, the presence of Pb2+ led to the aggregation of glutathione conjugated gold nanoparticles (GSH-GNPs). Hence, by measuring the variation of the PA-LINB signal after the aggregation of GSH-GNPs, Pb2+ can be quantified. A low detection limit for Pb2+ (42 nM) and a wide linear working range (42 ~ 1000 nM) was achieved. Furthermore, the proposed method showed good selectivity against other metal ions.

Keywords:Photoacoustic, Laser-induced nanobubbles, Gold nanoparticles, Aggregation, Pb2+

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