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Rapid Determination of Thiabendazole Pesticides in Rape by Surface Enhanced Raman Spectroscopy

1,2,†, 1,2,†, 1,2,3, 1,2, 1,2,*, 1,2 and 1,2
1
College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
2
Key Laboratory of Sensors Sensing, Ministry of Agriculture, Hangzhou 310058, China
3
State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310058, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Sensors 2018, 18(4), 1082; https://doi.org/10.3390/s18041082
Received: 7 March 2018 / Revised: 29 March 2018 / Accepted: 2 April 2018 / Published: 4 April 2018
(This article belongs to the Special Issue Applications of Raman Spectroscopy in Sensors)
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Abstract

Thiabendazole is widely used in sclerotium blight, downy mildew and black rot prevention and treatment in rape. Accurate monitoring of thiabendazole pesticides in plants will prevent potential adverse effects to the Environment and human health. Surface Enhanced Raman Spectroscopy (SERS) is a highly sensitive fingerprint with the advantages of simple operation, convenient portability and high detection efficiency. In this paper, a rapid determination method of thiabendazole pesticides in rape was conducted combining SERS with chemometric methods. The original SERS were pretreated and the partial least squares (PLS) was applied to establish the prediction model between SERS and thiabendazole pesticides in rape. As a result, the SERS enhancing effect based on silver Nano-substrate was better than that of gold Nano-substrate, where the detection limit of thiabendazole pesticides in rape could reach 0.1 mg/L. Moreover, 782, 1007 and 1576 cm−1 could be determined as thiabendazole pesticides Raman characteristic peaks in rape. The prediction effect of thiabendazole pesticides in rape was the best ( R p 2 = 0.94, RMSEP = 3.17 mg/L) after the original spectra preprocessed with 1st-Derivative, and the linear relevance between thiabendazole pesticides concentration and Raman peak intensity at 782 cm−1 was the highest (R2 = 0.91). Furthermore, five rape samples with unknown thiabendazole pesticides concentration were used to verify the accuracy and reliability of this method. It was showed that prediction relative standard deviation was 0.70–9.85%, recovery rate was 94.71–118.92% and t value was −1.489. In conclusion, the thiabendazole pesticides in rape could be rapidly and accurately detected by SERS, which was beneficial to provide a rapid, accurate and reliable scheme for the detection of pesticides residues in agriculture products. View Full-Text
Keywords: Surface Enhanced Raman Spectroscopy (SERS); rape; thiabendazole pesticides; PLS; rapid detection Surface Enhanced Raman Spectroscopy (SERS); rape; thiabendazole pesticides; PLS; rapid detection
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Lin, L.; Dong, T.; Nie, P.; Qu, F.; He, Y.; Chu, B.; Xiao, S. Rapid Determination of Thiabendazole Pesticides in Rape by Surface Enhanced Raman Spectroscopy. Sensors 2018, 18, 1082.

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