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Perez A.,Farmacognosia y Productos Naturales | Gonzalez G.,Farmacognosia y Productos Naturales | Gonzalez J.,Farmacognosia y Productos Naturales | Heinzen H.,Farmacognosia y Productos Naturales
Journal of AOAC International | Year: 2010

An efficient, fast, and accurate matrix solid-phase dispersion sample cleanup procedure was developed specifically for the determination of pesticide residues in lanolin. The scope of the method for organophosphorus, organochlorine, and pyrethroid insecticides is the same as that of official methods from various pharmacopeias. After lanolin dispersion on C18 bonded silica, pesticides are eluted with acetonitrile saturated with n-hexane. Recoveries ranged from 83 to 118% with RSD values of <20% for most pesticides listed, in compliance with the requirements of European and U.S. pharmacopeias. Source


Niell S.,Farmacognosia y Productos Naturales | Pareja L.,Farmacognosia y Productos Naturales | Gonzalez G.,Farmacognosia y Productos Naturales | Gonzalez J.,Farmacognosia y Productos Naturales | And 5 more authors.
Journal of Agricultural and Food Chemistry | Year: 2011

A validated analytical method for the multiresidue analysis of 40 organophosphate pesticides (OPs) and conversion products in raw wool has been developed. The method is based on the selective microwave-assisted extraction (MAE) of raw wool with acetonitrile and analysis of extracts by gas chromatography-flame photometric detector. The optimum MAE conditions were 20 min duration at 80 °C with 30 mL of acetonitrile per gram of wool. A validation study was performed according to the European SANCO guidelines 10684/2009. Limits of detection and quantification for all pesticides tested were from 0.01 to 0.2 mg/kg and from 0.2 to 1.0 mg/kg, respectively. The average recoveries of pesticides spiked at different levels were in the range of 70-120% with relative standard deviations of ≤20%. The extraction performance was compared to the one obtained with a reference Soxhlet extraction. The method was also applied in the analysis of real wool (after field application) samples. © 2011 American Chemical Society. Source

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