Solid phase extraction for the confirmation of results in polar pesticides residue analysis by HPTLC.
HPTLC is a convenient method for confirming the presence and identification of pesticide residues following gas chromatographic analysis of sample solutions obtained by clean-up according to the Deutsche Forschungsgemeinschaft multiresidue method S 19. For several crops, however, the polar eluates 4 and 5 obtained from the small silica gel column are abounding with co-extractives which interfere with HPTLC determination and also with GLC in some cases. They are effectively removed by solid phase extraction on a small aminopropyl cartridge, using a tertbutyl methyl ether/methanol (99 + 1) mixture as the eluant. The recoveries for 28 polar pesticides were not adversely affected.
Institut für Lebensmittelchemie, Universität Münster, Germany.
S
S
Mouratidis
H P
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Thier
D002800:Cholinesterase Inhibitors / Q000032:analysis; D002849:Chromatography, Gas / Q000379:methods; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002855:Chromatography, Thin Layer / Q000379:methods; D007202:Indicators and Reagents; D010573:Pesticide Residues / Q000032:analysis* / Q000302:isolation & purification; D012015:Reference Standards; D012680:Sensitivity and Specificity; D012997:Solvents
D002800:Cholinesterase Inhibitors; D007202:Indicators and Reagents; D010573:Pesticide Residues; D012997:Solvents