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Detection of Pesticides in Fruits by Surface-Enhanced Raman Spectroscopy Coupled with Gold Nanostructures

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Abstract

There is growing concern in recent years for consumers about contamination of pesticides in fruits due to increasing use of pesticides in fruits. The objective of this study was to use surface-enhanced Raman spectroscopy (SERS) to detect and characterize pesticides extracted from fruit surfaces. Gold-coated SERS-active nanosubstrates were used for SERS measurement. Three types of pesticides (carbaryl, phosmet, and azinphos-methyl) widely used in apples and tomatoes were selected. Significantly enhanced Raman signals of pesticides were acquired by SERS from the extract of fruit samples and exhibited characteristic patterns of the analytes. Multivariate statistical methods such as partial least squares and principal component analysis were used to develop quantitative and qualitative models. SERS was able to detect all three types of pesticides extracted from fruit samples at the parts per million level. The study of detection limit demonstrated that at 99.86% confidence interval, SERS can detect carbaryl at 4.51 ppm, phosmet at 6.51 ppm, and azinphos-methyl at 6.66 ppm spiked on apples; and carbaryl at 5.35 ppm, phosmet at 2.91 ppm, and azinphos-methyl at 2.94 ppm on tomatoes. Most of these detection limits meet the maximum residue limits established by Food and Agriculture Organization of the United Nations and World Health Organization. Satisfactory recoveries (78–124%) were achieved for samples with concentrations at and larger than the detection limit. These results demonstrate that SERS coupled with novel SERS-active nanosubstrates is a rapid, sensitive, and reliable method for detection and characterization of chemical contaminants in foods.

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Acknowledgements

This research was supported by the Open Project Program (No. SKLF-KF-201108) of State Key Laboratory of Food Science and Technology, Jiangnan University.

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Authors and Affiliations

  1. School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, 214122, China

    Bin Liu, Peng Zhou & Xiaoming Liu

  2. Food Science Program, Division of Food Systems & Bioengineering, University of Missouri, Columbia, MO, 65211, USA

    Bin Liu & Mengshi Lin

  3. Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO, 65211, USA

    Xin Sun & Hao Li

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  1. Bin Liu
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  2. Peng Zhou
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  3. Xiaoming Liu
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Correspondence to Peng Zhou or Mengshi Lin.

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Liu, B., Zhou, P., Liu, X. et al. Detection of Pesticides in Fruits by Surface-Enhanced Raman Spectroscopy Coupled with Gold Nanostructures. Food Bioprocess Technol 6, 710–718 (2013). https://doi.org/10.1007/s11947-011-0774-5

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