Rapid and simple analysis of pesticides persisting on green pepper surfaces swabbing with solvent-moistened cotton.
A rapid and simple nondestructive extraction (NDE) method that includes wiping off of systemic neonicotinoid insecticides has been developed to streamline sample pretreatment procedures conducted before chromatographic determination. Pesticide residues were extracted from green pepper surfaces by swabbing  them with absorbent cotton moistened with acetone or acetonitrile. After spraying of pesticides, the extraction rate decreased gradually, except for thiacloprid. Presumably, extraction rates depend on the physicochemical properties of pesticides, especially water solubility. It was thought that the applicability of the proposed method greatly depended on the systemic speed of each pesticide, and water solubility was placed as the index that was important to  making certain. Direct analysis of some insecticides persisting on sample surfaces has been possible only by extraction before chromatographic determination. These findings indicate strongly that the proposed NDE method has collateral conditions, but it appears promising for on-site pretreatment for pesticide residue analysis.
National Institute for Agro-Environmental Sciences, Tsukuba, Ibaraki 305-8604, Japan. eikiw@affrc.go.jp
Eiki
E
Watanabe
Yuso
Y
Kobara
Yasuhiro
Y
Yogo
D002212:Capsicum / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D005506:Food Contamination / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis* / Q000302:isolation & purification*; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods*
D010573:Pesticide Residues