Abstract
A method for the simultaneous determination of the benzoylurea insecticides diflubenzuron, flufenoxuron, flucycloxuron chlorfluazuron and triflumuron in apples using reversed-phase HPLC is described. The separation of analytes was performed on a Separon SGX C 8 column (150 × 3 mm I.D., 5 μm) with methanol-water (55:45, v/v) as the mobile phase. Benzoylurea residues were extracted with acetone and then partitioned into dichloromethane. The final clean-up step was conducted by gel permeation chromatography on Bio- Beads SX-3 using cyclohexane-chloroform (3:2, v/v) as the mobile phase.
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