title: Highly sensitive quantification of pyrethroid insecticide etofenprox in vegetables with high-performance liquid chromatography and fluorescence detection.
abstract: This paper describes a highly sensitive analytical method using high-performance liquid chromatography and fluorescence detection (HPLC-FLD) capable of quantifying trace amounts of synthetic pyrethroid insecticide etofenprox residue in six vegetable samples: bell pepper, cucumber, eggplant, Japanese mustard spinach, spinach, and tomato. After extraction with acetonitrile, the crude sample extract was cleaned up with a solid-phase extraction cartridge. The matrix interference derived from the tested vegetable samples was evaluated. Quantification was conducted using external calibrators prepared in pure acetonitrile. The limits of quantification for etofenprox in each sample were 1.87-3.87 ng/g. Recoveries obtained by application of the proposed analytical method of vegetable samples spiked at the considerably low levels (5-100 ng/g) were 85-111% with relative standard deviations of less than 12%. The proposed method using the HPLC-FLD was applied for trace analysis of the insecticide residue in vegetable samples.
authors: National Institute for Agro-Environmental Sciences, Tsukuba, Ibaraki 305-8604, Japan. Electronic address: eikiw@affrc.go.jp.
authors: Eiki
authors: E
authors: Watanabe
authors: National Institute for Agro-Environmental Sciences, Tsukuba, Ibaraki 305-8604, Japan.
authors: Koji
authors: K
authors: Baba
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000379:methods* / Q000592:standards; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D005453:Fluorescence; D005506:Food Contamination / Q000032:analysis*; D005524:Food Technology / Q000379:methods*; D010573:Pesticide Residues / Q000032:analysis*; D011722:Pyrethrins / Q000032:analysis*; D012680:Sensitivity and Specificity; D052616:Solid Phase Extraction; D014675:Vegetables / Q000737:chemistry*
chemical_list: D010573:Pesticide Residues; D011722:Pyrethrins; C076840:ethofenprox
keywords: Etofenprox; HPLC–FLD; Matrix interference; Residue analysis; Solid-phase extraction; Vegetable samples