Target-triggered inhibiting oxidase-mimicking activity of platinum nanoparticles for ultrasensitive colorimetric detection of silver ion |
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| Authors: | Haohua Deng Shaobin He Xiuling Lin Lu Yang Zhen Lin Ruiting Chen Huaping Peng Wei Chen |
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| Institution: | 1. College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China;2. Guangdong Institute of Microbiology, Guangzhou, 510070, China;3. The Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou, 510642, China;1. Advanced Materials Group, Materials Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India;2. Academy of Scientific and Innovative Research, CSIR-NEIST Campus, India;3. Univ. Lille1, CNRS, Centrale Lille, ISEN, Univ. Valenciennes, UMR 8520 ? IEMN, F-59000 Lille, France;1. State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, PR China;2. School of Chemistry, Dalian University of Technology, Dalian 116023, PR China;3. School of Science and Technology, Kwansei Gakuin Universty, 2-1 Gakuen, Sanda, Hyogo 660-1337, Japan |
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| Abstract: | The development of efficient methods for the detection of hazardous and toxic elements is extremely important for environmental security and public health. In this work, we developed a facile colorimetric assaying system for Ag+ detection in aqueous solution. Chitosan-stabilized platinum nanoparticles (Ch-PtNPs) were synthesized and severed as an artificial oxidase to catalyze the oxidation of the substrate 3,3′,5,5′-tetramethylbenzidine (TMB) and generate color signal. In the presence of Ag+, due to the strong metallophilic interactions between Ag+ and Pt2+ on the surface of Ch-PtNPs, Ag+ can weaken the affinity to the substrates and inactivate the catalytic activity of Ch-PtNPs, leading to decreased absorbance signal to varying degrees depending on Ag+ amount. Combing the specific binding between Ch-PtNPs and Ag+ with signal amplification procedure based on the Ch-PtNPs-catalyzed TMB oxidation, a sensitive, selective, simple, cost-effective, and rapid detection method for Ag+ can be realized. Ag+ ions in tap and lake waters have been successfully detected. We ensured that the proposed method can be a potential alternative for Ag+ determination in environmental samples. |
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| Keywords: | Colorimetric detection Oxidase-like activity Platinum nanoparticle Tetramethylbenzidine Silver ion |
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