DESENVOLVIMENTO DE MÉTODO MULTIRESIDUAL PARA ANÁLISE DE PESTICIDAS EM MEL, UTILIZANDO CROMATOGRAFIA A LÍQUÍDO COM DETECTOR ESPECTROFOTOMÉTRICO COM ARRANJO DE DIODOS

Abstract

Honey is a product of proven therapeutic and nutritional properties, and which may act as an excellent bioindicator, given the way the bees gather and process the raw material used in its preparation. The monitoring of pesticide residues in honey is important both to control product quality in domestic and international markets, and in assessing the potential for contamination in areas near agricultural crops. Considering these facts, we developed a method for analyzing carbamate insecticides (carbaryl and carbofuran), organochlorine (aldrin and dieldrin), organophosphates (dimethoate and parathion methyl) and pyrethroid (permethrin), and the group of anilides herbicide (propanil) and fenoxiácidos (2,4-D) in honey. Hence, in this work the analytical conditions were established for the proper determination of residues of pesticides cited using the technique of solid phase extraction and liquid chromatography with UV detection with a diode array. The study aimed to compare different analytical conditions for the determination of pesticides, looking for better separation, sensitivity, precision and accuracy in the determination of pesticide residues in samples of honey bees. Standard solutions at concentrations ranging from 1.0 to 20.0 μ g mL-1 were evaluated in different mobile phases, using a C18 column (250 x 4.6 mm id, 5 μ m). The mobile phase composition more suitable was acetonitrile: water at pH 3.0 (acidified with acetic acid) in gradient mode, for monitoring the compounds at a wavelength of 220 nm. In the established conditions, except for aldrin and dieldrin and dimeotate, it was observed recoveries between 75.26% and 113.58%, with variation Coefficients Between 2.16% and 11.31% for concentration levels raging from 0:10 to 1.00 μ gg-1 (correlation coefficients between 0.9978 and 0.9998). Recoveries lower than 50% to the cited insecticides were observed when using ethyl acetate solvent extractor and the solvent elution by ethyl acetate, in such a way new studies can be done to obtain better recoveries for these compounds.