HPLC determination of flufenoxuron residues in Capsicum and tomato

An HPLC method for determination of flufenoxuron residues in Capsicum and tomato was established using a Thermo Hypersil-ODS C18 reverse phase column (250 × 4.6 mm),methanol-water (80∶20,by vol) as the mobile phase,a flow rate of 1.0 ml/min,and detection at 245 nm. Capsicum and tomato samples were extracted with acetone,purified using LLE with dichloromethane,cleaned up with a neutral Al2O3 column,and quantitatively analyzed with an external standard method. The average recovery rate was 87.51 to 102.13%,with a coefficient of variation of 0.07 to 6.02%,a limit of detection of 8.809 × 10-10 g,and a minimum detectable concentration of 0.011 mg/kg. Accuracy,precision,and sensitivity of the method all satisfactorily met the demands of pesticide residue analysis.