Oxidized multiwalled carbon nanotubes decorated with silver nanoparticles for fluorometric detection of dimethoate

Chun-Wei Hsu; Zhong-Yi Lin; Tzu-Yi Chan; Tai-Chia Chiu; Cho-Chun Hu

doi:10.1016/j.foodchem.2016.12.095

Oxidized multiwalled carbon nanotubes decorated with silver nanoparticles for fluorometric detection of dimethoate

Food Chem. 2017 Jun 1:224:353-358. doi: 10.1016/j.foodchem.2016.12.095. Epub 2016 Dec 28.

Authors

Chun-Wei Hsu¹, Zhong-Yi Lin², Tzu-Yi Chan³, Tai-Chia Chiu⁴, Cho-Chun Hu⁵

Affiliations

¹ Department of Applied Science, National Taitung University, Taitung, Taiwan, ROC. Electronic address: [email protected].
² Department of Applied Science, National Taitung University, Taitung, Taiwan, ROC. Electronic address: [email protected].
³ Department of Applied Science, National Taitung University, Taitung, Taiwan, ROC. Electronic address: [email protected].
⁴ Department of Applied Science, National Taitung University, Taitung, Taiwan, ROC; Agriculture Products Inspection Center, National Taitung University, Taitung, Taiwan, ROC. Electronic address: [email protected].
⁵ Department of Applied Science, National Taitung University, Taitung, Taiwan, ROC; Agriculture Products Inspection Center, National Taitung University, Taitung, Taiwan, ROC. Electronic address: [email protected].

PMID: 28159279
DOI: 10.1016/j.foodchem.2016.12.095

Abstract

A novel method for the detection of dimethoate based on the peroxidase-like activity of silver-nanoparticles-modified oxidized multiwalled carbon nanotubes (AgNPs/oxMWCNTs) has been developed. The synthesized AgNPs/oxMWCNTs showed excellent peroxidease-like catalytic activity in hydrogen peroxide-Amplex red (AR) system (AR is oxidized to resorufinat, with the resorufin fluorescence at 584nm being used to monitor the catalytic activity). After dimethoate was added to AgNPs/oxMWCNTs, the interaction between dimethoate and the AgNPs inhibited the catalytic activity of AgNPs/oxMWCNTs. The decrease in fluorescence was used for the detection of dimethoate in the range of 0.01-0.35μgmL^-1 (R²=0.998) with a detection limit of 0.003μgmL^-1 (signal/noise=3). This method exhibited good selectivity for the detection of dimethoate even in the presence of high concentration of other pesticides. Consequently, the method was applied to measure the concentration of dimethoate residue in lake water and fruit, thus obtaining satisfactory results.

Keywords: Carbon nanotube; Dimethoate; Nanosensor; Peroxidase-like catalyst; Silver nanoparticles.

MeSH terms

Dimethoate / analysis*
Fluorometry
Food Analysis
Fruit / chemistry
Hydrogen Peroxide / metabolism
Lakes / chemistry
Limit of Detection
Metal Nanoparticles / chemistry*
Nanotubes, Carbon / chemistry*
Pesticides / analysis
Silver / chemistry*

Substances

Nanotubes, Carbon
Pesticides
Silver
Hydrogen Peroxide
Dimethoate