1. Academic Validation
  2. Stereoselective Analysis of Chiral Pyrethroid Insecticides Tetramethrin and α-Cypermethrin in Fruits, Vegetables, and Cereals

Stereoselective Analysis of Chiral Pyrethroid Insecticides Tetramethrin and α-Cypermethrin in Fruits, Vegetables, and Cereals

  • J Agric Food Chem. 2019 Aug 21;67(33):9362-9370. doi: 10.1021/acs.jafc.9b01850.
Pengfei Zhao 1 Xinyi Dong 1 Xiaoming Chen 2 Xingjie Guo 1 Longshan Zhao 1
Affiliations

Affiliations

  • 1 School of Pharmacy , Shenyang Pharmaceutical University , Shenyang 110016 , China.
  • 2 Daicel Chiral Technologies (China) Co., Ltd , Shanghai 200131 , China.
Abstract

This manuscript presents an effective and robust method for simultaneous stereoselective determination of two pyrethroid insecticides, tetramethrin and α-cypermethrin in different food products by high-performance liquid chromatography. Enantioseparation was carried out using reversed-phase chromatography, and the influences of four polysaccharide-based chiral columns, mobile phase composition, and column temperature on retention were fully investigated. Satisfactory separation was obtained on Chiralpak IG column using acetonitrile-water (75:25, v/v) under isocratic conditions. To extract and purify the target analytes from food matrices, matrix solid-phase dispersion was employed with C18 as dispersant and primary secondary amine as well as graphitized carbon black as cleanup sorbents. Response surface method based on Box-Behnken design was implemented to assist optimization of the extraction variables. Then, method validation was done in real samples including specificity, linearity, sensitivity, trueness, precision, as well as stability, and its analytical performance fulfills the criteria recommended by the European Union SANTE/11945/2015, demonstrating its applicability in studying the stereochemistry of chiral tetramethrin and α-cypermethrin in food products.

Keywords

chiral pesticide; food; stereoselective analysis; tetramethrin; α-cypermethrin.

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