Abstract

DANGOND ARAUJO, Jose Jairo  and  GUERRERO DALLOS, Jairo Arturo. METHODOLOGY FOR DETERMINATION OF BENZIMIDAZOLIC FUNGICIDES RESIDUES IN STRAWBERRY AND LETTUCE BY HPLC-DAD. Rev.Colomb.Quim. [online]. 2006, vol.35, n.1, pp.67-79. ISSN 0120-2804.

Systemic fungicides like benzimidazolic compounds are used to protect several crops of fruits and vegetables. In this work a new method for analysis of benomyl, carbendazim and thiabendazol in strawberry and lettuce by High-performance liquid chromatography with diode array detector (HPLC-DAD) was validated. Benomyl residues were determined after its conversion to carbendazim. Pesticide residues were extracted from strawberry and lettuce samples with ethyl acetate and these extracts were cleaned up by gel permeation chromatography (GPC). Final determination was carried out by HPLC-DAD in reverse phase column. The method is selective, specific, precise and accuracy. The calibrate curves show linearity over concentration range of 1,24 to 6,19 mg/kg, with detection limits of 0,27 and 0,40 mg/kg and quantification limits of 0,85 and 1,35 mg/kg for carbendazim and thiabendazol respectively. The recovery experiments yielding averages of 90%. No residues of these compounds were founded in recollected samples from specific states of Cundinamarca, Colombia.

Keywords : Benzimidazolics; Strawberry; Lettuce; Liquid Chromatography; Gel permeation Chromatography.

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