Establishment of rapid detection method of phosalone residues in pakchoi by surface-enhanced Raman scattering spectroscopy

ABSTRACTSurface-enhanced Raman scattering spectroscopy method coupled with colloidal gold was used to detect and characterize phosalone pesticide in pakchoi. Theoretical and experimental Raman spectra were compared to analyze and identify the assignment of vibrations. Pakchoi samples containing phosalone pesticide residues were prepared and extracted for Raman spectra acquirement and gas chromatography-mass spectrometry measurement. A statistical regression analysis method was applied for the detection of phosalone residues. This analytical method was validated by predicted recovery and the paired-samples T test with five unknown samples. This study demonstrates that surface-enhanced Raman scattering (SERS) method is capable of detecting phosalone residues in pakchoi quickly and accurately.