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Ligand exchange reactions on citrate-gold nanoparticles for parallel colorimetric assay of six pesticides

Abstract

In this work, we explore the ligand exchange reactions on citrate-gold nanoparticles (citrate-Au NPs) for facile and rapid parallel colorimetric identification of six pesticides including three organophosphorus (acephate, phenthoate, and profenofos), neonicotinoid (acetamiprid), chloronitrile (chlorothalonil) and thiocarbamate (cartap) in water and vegetable samples. The citrate-Au NPs acted as probes for parallel colorimetric assay of six pesticides based on the significant red-shift in their surface plasmon resonance (SPR) band, which is due to the aggregation of Au NPs via ligand exchange reactions. Under optical conditions, the probe exhibited good linearity in micromolar concentration for six pesticides. Importantly, the sensing system showed lower detection limits at nanomolar range for six pesticides and exhibited good selectivity in the presence of commonly found inorganic species. The potentiality of the method was assessed by analyzing six pesticides in spiked water and food samples, suggesting that the method exhibited good recoveries, which signifies that the practical application of the method for on-site and real-time parallel colorimetric sensing of six pesticides with simplified procedure.

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Publication details

The article was received on 16 Mar 2018, accepted on 16 Apr 2018 and first published on 17 Apr 2018


Article type: Paper
DOI: 10.1039/C8NJ01294F
Citation: New J. Chem., 2018, Accepted Manuscript
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    Ligand exchange reactions on citrate-gold nanoparticles for parallel colorimetric assay of six pesticides

    K. Rana, J. Bhamore, J. R. Kumar, T. J. Park and S. K. Kailasa, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ01294F

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