Rapid determination of pesticide multiresidues in panax ginseng by QuEChERS-gas chromatography-mass spectrometry

doi:10.3724/SP.J.1123.2018.06015

Abstract

Abstract:

In this study, the extraction and purification improvements of the QuEChERS method were coupled with gas chromatography-mass spectrometry (GC-MS) to determine 20 pesticides in panax ginseng. Dry ginseng powder was mixed with water, and the solution was then extracted with acetonitrile and purified with N-propylethylenediamine (PSA) and MgSO₄ to remove co-extractives that might interfere with the results. The target compounds were detected after electron-impact ionization in selected ion monitoring (SIM) mode. Under optimum conditions, the method gave a good linear relationship for the determination of the pesticides within a certain concentration range, with correlation coefficients greater than 0.990. Moreover, the limits of detection (S/N=3) were 0.002-0.007 mg/kg, the limits of quantification (S/N=10) were 0.002-0.024 mg/kg, and the average recoveries for pesticides in panax ginseng were 70.41%-114.06%, with relative standard deviations of 0.76%-15.47%. In comparison with previous methods, the new procedure has the advantages of simple sample preparation and higher sensitivity.

Key words: panax ginseng, gas chromatography-mass spectrometry (GC-MS), pesticides, QuEChERS

CLC Number:

O658

CUI Lili, YAN Meixia, PIAO Xiangmin, PANG Shifeng, WANG Yingping. Rapid determination of pesticide multiresidues in panax ginseng by QuEChERS-gas chromatography-mass spectrometry[J]. Chinese Journal of Chromatography, 2018, 36(11): 1173-1180.

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