Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 250, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2020.119366
Keywords
Surface-enhanced Raman spectroscopy; Competitive adaptive reweighted sampling; Support vector machine; Chlorpyrifos; Rapid pretreatment; Tea
Categories
Funding
- National Natural Science Foundation of China [31460315]
- Science Foundation for Post Doctorate Research [2015KY21]
- Key R&D Program Project of Jiangxi Province [20171ACF60004]
- Jiangxi Key Laboratory of Tea Quality and Safety Control [20192BCD40007]
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The study utilized a method combining rapid pretreatment and Chemometrics-based Surface Enhanced Raman Spectroscopy to quickly determine chlorpyrifos residue in tea, achieving rapid and accurate detection by optimizing characteristic peaks and using different dosages of chemicals to eliminate substrate interference.
Surface enhanced Raman spectroscopy based on rapid pretreatment combined with Chemometrics was used to determine chlorpyrifos residue in tea. Au nanoparticles were used to as enhance substrate. Different dosages of PSA and NBC were investigated to eliminate the tea substrate influence. Competitive adaptive reweighted sampling (CARS) was used to optimize the characteristic peaks, and compared to full spectra variables and the experiment selected variables. The results showed that PSA of 80 mg and NBC of 20 mg was an excellent approach for rapid detecting. CARS - PLS had better accuracy and stability using only 1.7% of full spectra variables. SVM model achieved better performance with R-p(2) = 0.981, RMSEP = 1.42 and RPD = 6.78. Recoveries for five unknown concentration samples were 98.47 similar to 105.18% with RSD similar to 1.53% similar to 5.18%. T-test results showed that t value was 0.720, less than t0.05,4 = 2.776, demonstrating that no clear difference between the real value and predicted value. The detection time of a single sample is completed within 15 min. This study demonstrated that SERS coupled with Chemometrics and QuEChERS may be employed to rapidly examine the chlorpyrifos residue in tea towards its quality and safety monitoring. (C) 2020 Elsevier B.V. All rights reserved.
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