An efficient LSPR method to quantitatively detect dimethoate: Development, characterization and evaluation

Dongxian Li; Yanyan Zhang; Qingqian Guo; Xiaoquan Sun; Hao Zhang; Shun Wang; Zephania Birech; Jiandong Hu

doi:10.1371/journal.pone.0239632

An efficient LSPR method to quantitatively detect dimethoate: Development, characterization and evaluation

PLoS One. 2020 Sep 24;15(9):e0239632. doi: 10.1371/journal.pone.0239632. eCollection 2020.

Authors

Dongxian Li^{1

2}, Yanyan Zhang^{1

2}, Qingqian Guo^{1

2}, Xiaoquan Sun³, Hao Zhang^{1

2}, Shun Wang⁴, Zephania Birech⁵, Jiandong Hu^{1

2

6}

Affiliations

¹ Department of Electrical Engineering, Henan Agricultural University, Zhengzhou, China.
² Henan International Joint Laboratory of Laser Technology in Agriculture Sciences, Zhengzhou, China.
³ Henan Institute of Metrology, Zhengzhou, China.
⁴ College of Science, Henan Agricultural University, Zhengzhou, China.
⁵ Department of Physics, University of Nairobi, Nairobi, Kenya.
⁶ State Key Laboratory of Wheat and Maize Crop Science, Zhengzhou, China.

Abstract

In recent years, there has been growing concern among consumers about pesticide contamination in fruits. Therefore, rapid, reliable, and consistent detection methods for OPPs, especially dimethoate, are crucially needed. The existing quantitative methods for detecting dimethoate are not suitable for rapid measuring system such as the dimethoate samples from two channels. Hence this paper examines the utilization of a dual-channel system for utilize the absorption variations of the Localized Surface Plasmon Resonance (LSPR) bands of gold nanoparticles (AuNPs) were investigate for detection of dimethoate. Under optimized conditions, the relationship between concentrations of dimethoate and absorbance ratios (A(520)/A(640)) was linearly found in the concentration range of 10-100 nM. Result from the experiment shows that both channels exhibit a linear correlation coefficient as high as 0.97 and a limit of detection (LOD) as low as 5.5 nM. This LSPR detection system was characterized by testing the dimethoate in apple samples and the recovery rates were found to be in the range of 85.90% to 107.37%. The proposed dual-channel LSPR system for detecting dimethoate creating a new approach for detecting organophosphate insecticide in agricultural fields. It could lay the foundation for designing a high-throughput analysis of the insecticides using a wavelength division multiplexing switch (WDMS).

Publication types

Evaluation Study
Research Support, Non-U.S. Gov't

MeSH terms

Crops, Agricultural / chemistry
Crops, Agricultural / standards*
Dimethoate / analysis*
Food Analysis / methods*
Food Analysis / standards
Food Contamination / analysis*
Fruit / chemistry
Fruit / standards*
Insecticides / analysis*
Sensitivity and Specificity
Surface Plasmon Resonance / methods*
Surface Plasmon Resonance / standards

Substances

Insecticides
Dimethoate

Grants and funding

This project was financially supported by the National Natural Science Foundation of China (31671581), China Postdoctoral Science Foundation (2017M612399).