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Abstract
Gas chromatography with nitrogen phosphorus detector (GC-NPD) was applied to the simultaneous determination of 15 organophosphorus and 6 organonitrogen pesticides residues in Angelica sinensis. The pesticides were extracted by microwave-assisted extraction (MAE) and ultrasound-assisted extraction (UAE) techniques, respectively. The experimental variables were optimized through orthogonal array experimental design. Cleanup of extracts was performed with column chromatography using florisil and neutral aluminum as the sorbents. The determination of pesticides in the final extracts was carried out by GC-NPD. Under optimized conditions, the average recoveries obtained from MAE and UAE are in the range of 75.1–129% and 70.6–129%, respectively, and the relative standard deviations of MAE and UAE were 3.1–10.6% and 1.0–17.8%, respectively.
Acknowledgments
The authors gratefully acknowledge the financial support of this study by the Natural Science Foundation of China (20765002 and 20965005), the State Key Laboratory of Food Science and Technology (SKLF-MB-200807), the Key Laboratory Open Foundation of Food Science of the Ministry of Education, Nanchang University (NCU200408) and the program for Changjiang Scholars and Innovative Research Team in University (IRT0540).