Abstract
A rapid and sensitive HPLC method has been developed and validated for the determination of abamectin residues (avermectin B 1a and B 1b, as well as the metabolite 8,9- Z-avermectin B 1) in apples, pears and tomatoes. Residues are extracted with acetonitrile. The diluted extract is cleaned up on a C 18 solid-phase extraction cartridge. Abamectin residues are derivatised with trifluoroacetic acid and 1-methylimidazole and determined by reversed-phase liquid chromatography with fluorescence detection (excitation: 365 nm and emission: 470 nm). High and consistent recoveries, ranging from 88 to 106%, were obtained, at spiking levels of 10, 20 and 50 μg/kg, when analysing apples, pears and tomatoes.
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