ISSN:
1612-1112
Keywords:
Gas chromatography-mass spectrometry
;
Organochlorine and organophosphorus pesticides
;
Herbal medicines
;
Selective-ion monitoring
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary Multicomponent pesticide residues in herbal medicines have been analyzed by gas chromatography-mass spectrometry (GC-MS) with electron impact (EI) ionization and positive- and negative-ion chemical ionization (PCI and NCI). Herbal medicines (5 g) were extracted with 65∶35 (%,v/v) acetonitrile-water, and partitioned with hexane-diethyl ether (1∶1) and hexane-dichloromethane (1∶1). The organic phase of the extracted fraction was cleaned on a Florisil column and analyzed by GC-MS with selected-ion monitoring (SIM). Method detection limits for 27 pesticides were tens of picograms for ECD, NPD and EI-SIM MS, and a few picograms for NCI-SIM MS. The calibration curve for the pesticide standard solution was linear within the range 0.003–30 pg for EI-SIM MS, PCI-SIM MS, and NCI-SIM MS. Mean recoveries of pesticides from spiked herbal medicines (0.75, 1.5, 3 pg) were 61–125% (RSD1–32%) for NCI-SIM MS and 74–121% (RSD 4–12%) for EI-SIM MS. Detection sensitivity and specificity of NCI-SIM MS were better than for ECD and NPD. Parallel use of EI-SIM MS, PCI-SIM MS and NCI-SIM MS was an excellent complementary method for identification and confirmation of multi-component pesticide residues in variety of herbal medicines.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02467753
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