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Quantitative Detection of Isofenphos-Methyl in Corns Using Surface-Enhanced Raman Spectroscopy (SERS) with Chemometric Methods

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Abstract

Residual pesticides in agricultural production are one of the major food safety concerns around the world. In this study, we investigated the amount of isofenphos-methyl in corns by using surface-enhanced Raman spectroscopy (SERS) coupled with chemometric methods. The highest isofenphos-methyl peak at 1043 cm−1 was used to detect and quantify the amount of isofenphos-methyl spiked in methanol-water (1:1) solvent and corns. The limits of detection (LODs) of isofenphos-methyl in methanol-water solvent and corns were 0.01 μg/mL and 0.01 μg/g, respectively. Quantitative detection of isofenphos-methyl residues (0–5 μg/mL) was conducted using partial least squares (PLS) model. Based upon the results of leave-one-out cross-validation, isofenphos-methyl could be predicted by PLS (the correlation coefficient was 0.9964) with a low root mean square error of calibration (RMSEC=0.146). The developed SERS method provides a much simpler and more sensitive way to monitor isofenphos-methyl for safe production of corns, which can be extended to the other agricultural products.

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Correspondence to Zhifeng Dou.

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Funding

This research was supported by the National Natural Science Foundation of China (No. 31601426), the Natural Science Foundation of Hainan Province (No. 20163058, 20152018), and the Research Start-up Fund Project of Hainan University (No. kyqd1521).

Conflict of Interest

Dongli Liu declares that she has no conflict of interest. Yu Han declares that he has no conflict of interest. Liya Zhu declares that she has no conflict of interest. Wen Chen declares that she has no conflict of interest. Yi Zhou declares that she has no conflict of interest. Jian Chen declares that he has no conflict of interest. Zhiguo Jiang declares that he has no conflict of interest. Xianying Cao declares that she has no conflict of interest. Zhifeng Dou declares that he has no conflict of interest.

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This article does not contain any studies with human or animal subjects.

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Liu, D., Han, Y., Zhu, L. et al. Quantitative Detection of Isofenphos-Methyl in Corns Using Surface-Enhanced Raman Spectroscopy (SERS) with Chemometric Methods. Food Anal. Methods 10, 1202–1208 (2017). https://doi.org/10.1007/s12161-016-0677-1

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