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SERS Detection of Insecticide Amitraz Residue in Milk Based on Au@Ag Core-Shell Nanoparticles

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Abstract

A simple, rapid, and environmentally friendly surface-enhanced Raman scattering (SERS) method was developed for the determination of trace amitraz in milk with the use of silver-coated gold nanoparticles (Au@Ag NPs) as enhancing reagent. The normal Raman and SERS spectra of amitraz were analyzed, and the peaks were assigned by density functional theory. The morphology of Au@Ag NPs was characterized and confirmed by transmission electron microscopy, scanning electron microscopy, and ultraviolet-visible spectroscopy. The SERS effects of Au@Ag NPs were investigated, including the types of solvents for dissolving amitraz, the volume ratio of the Au@Ag NPs and amitraz, and the concentration of aggregating agent (NaCl) for aggregate Au@Ag NPs. Results show that ethanol exerts the least interference on the SERS spectrum of amitraz and is more environmentally sound than methanol. The strongest SERS signal appeared when the volume ratio of Au@Ag NPs and amitraz was 2:1. Moreover, the strongest SERS signals appeared when the concentration of NaCl was 0.025 mol L−1 because of appropriate aggregation. Under the optimum conditions, the concentration of amitraz presents a good linear relationship with Raman intensity (723 cm−1) with a linear range of 9.77 × 10−4~2.93 × 10−2 g L−1. The detected recoveries of amitraz in milk were between 81.7 and 100.5% with a relative standard deviation (RSD) of 2.61~5.51%.

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Acknowledgements

This work was supported by the Natural Science Foundation of Zhejiang Province (LQ17B050002) and the Analysis and Measurement Foundation of Zhejiang Province (2015C37068).

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Authors and Affiliations

  1. State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032, China

    Pan Li, Yuanjie Teng, Yonghui Nie & Wenhan Liu

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  1. Pan Li
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  2. Yuanjie Teng
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  3. Yonghui Nie
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  4. Wenhan Liu
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Correspondence to Yuanjie Teng or Wenhan Liu.

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Pan Li declares that he has no conflict of interest. Yuanjie Teng declares that she has no conflict of interest. Yonghui Nie declares that he has no conflict of interest. Wenhan Liu declares that he has no conflict of interest.

Funding

This work was supported by the Natural Science Foundation of Zhejiang Province (LQ17B050002) and the Analysis and Measurement Foundation of Zhejiang Province (2015C37068).

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Li, P., Teng, Y., Nie, Y. et al. SERS Detection of Insecticide Amitraz Residue in Milk Based on Au@Ag Core-Shell Nanoparticles. Food Anal. Methods 11, 69–76 (2018). https://doi.org/10.1007/s12161-017-0966-3

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  • DOI: https://doi.org/10.1007/s12161-017-0966-3

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