Thin layer chromatographic determination of selected active ingredients of pesticides in foods of plant origin.
Kempe G., Schumann U., Speer K.
Author Affiliation: Landesuntersuchungsanstalt für das Gesundheits- u. Veterinärwesen Sachsen, Standort Chemnitz, Zschopauer Str. 87, D-09111 Chemnitz, Germany.
Deutsche Lebensmittel-Rundschau 95 : 231-234
Abstract : Samples of fruit and vegetables analysed for pesticides (benfuracarb, carbofuran, carbosulfan, chloroxuron, diflufenican, fluotrimazole, furathiocarb, imazalil, imidacloprid and thiodicarb) using multimethod S19 were determined using thin-layer chromatography with automated multiple development (AMD) and UV-detection. It was found that the eluates of the mini silica gel column were not suited to the determination of agents because of strong matrix influences. After the purification of solutions by solid-phase extraction on an amino cartridge, interfering substances present in eluates 4 and 5 could be removed to the extent that chloroxuron, imazalil and thiodicarb were detectable in the matrices of currants [Ribes], kiwifruits, mangoes, paprika, peaches and grapes. In some cases, detection limits were achieved that satisfy the German legal limits. However, rates of retrieval could not be determined.