Two chromatographic methods for the quantitative determination of some pesticides applied for cucumber pests in Egypt

Abstract

Two novel sensitive and accurate thin‐layer chromatography and high‐performance liquid chromatography methods were used for monitoring the residues of four pesticides: mandipropamid, metalaxyl, thiophenate methyl and carbendazim, which are widely used to eliminate cucumber pests in Egypt. The first method is a thin‐layer chromatography method, using silica gel plates as a stationary phase and hexane/methanol/acetone/glacial acetic acid (7.5:2:0.5:0.1, v/v) as a developing system. The second method is high‐performance liquid chromatography using isocratic elution and a mobile phase consisting of acetonitrile/0.02 molar potassium dihydrogen phosphate buffer (25:75, v/v) at a flow rate of 1 mL min−1 with UV detection at 225 nm. All the obtained results were evaluated regarding the agricultural committee of Egypt and showed acceptable pesticides residues.

Applying novel economic simple green sample preparation procedures on natural and industrial specimens for chromatographic determination of insecticidal residues

“…The development of specific methods of analysis for a mixture of little definite insecticides and/or fungicides is a new trend in residual assessment for food and environmental analysis 1 – 3 . The authors have been working consistently since early 2017 using this strategy starting with extensive studies concerning specific insecticide residues on cucumbers 4 , 5 .…”