期刊
TALANTA
卷 97, 期 -, 页码 131-141出版社
ELSEVIER
DOI: 10.1016/j.talanta.2012.04.007
关键词
Chinese herbal medicines; Pesticides; Gas chromatography-mass spectrometry; Microwave-assisted extraction; Dispersive-solid phase extraction; Multi-residue analysis
资金
- Natural Science Foundation of China [20965005]
- Science and Technology Planning Project of Jiangxi Province [2008BB22400]
- State Key Laboratory of Food Science and Technology in Nanchang University [SKLF-TS-200918, SKLF-MB-201002]
A simple, rapid and reliable method was proposed for the simultaneous determination of 27 pesticides (organophosphorus, organochlorine, pyrethroid and carbamate pesticides) in Radix astragali. The pesticides were extracted by acetonitrile and the experimental variables, such as temperature, extraction time and volume of acetonitrile, were optimized through orthogonal array experimental design. Cleanup of extracts was performed with dispersive-solid phase extraction using primary secondary amine (PSA) as the sorbent. The determination of pesticides in the final extracts was carried out by gas chromatography-mass spectrometry in selected ion monitoring mode (GC-MS, SIM). The linearity of the calibration curves is good in matrix-matched standard, and yields the coefficients of determination (R-2) >= 0.99 for approximately 96% of the target analytes. Under optimized conditions, the average recoveries (six replicates) for most pesticides (spiked at 0.02, 0.1 and 0.2 mg kg(-1)) range from 70% to 120%, and RSDs are less than 17.2%. (C) 2012 Elsevier B.V. All rights reserved.
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