Magnetic solid-phase extraction of benzoylurea insecticides in tea samples with F3O4 -hyperbranched polyester magnetic composite as sorbent

Chaoran Liu, Xinya Liu, Philip J. Marriott, Heng Qian, Zilin Meng, Zhirong Yang, Runhua Lu, Haixiang Gao, Wenfeng Zhou

Research output: Contribution to journalArticleResearchpeer-review

15 Citations (Scopus)


In this work, a method for the analysis of benzoylurea insecticides, including hexaflumuron, flufenoxuron, lufenuron and chlorfluazuron, in tea samples by high-performance liquid chromatography with Fe3O4 -hyperbranched polyester nanocomposite as the adsorbent for magnetic solid-phase extraction was developed. The magnetic nanocomposite was prepared and characterized by infrared spectroscopy, vibrating sample magnetometry, and scanning electron microscopy. The as-prepared nanocomposite was used as a sorbent for the extraction and preconcentration of pesticide residues in tea samples. The extraction and desorption conditions, including mass ratios of raw materials, amount of sorbent, pH value, extraction time, and desorption time, were investigated. Under the final conditions chosen for the analysis, good linearity was obtained for all the tested compounds, with R2 values of at least 0.9979. The limits of detection were determined in the range of 0.15–0.3 μg/L. The recovery obtained from the analysis of tea samples with various spiked concentrations was between 90.7 and 98.4%, with relative standard deviations (n = 4) lower than 4.1%. Furthermore, the present approach was successfully applied to the quantitative determination of residues of benzoylurea insecticides in real samples.

Original languageEnglish
Pages (from-to)1610-1619
Number of pages10
JournalJournal of Separation Science
Issue number8
Publication statusPublished - Apr 2019


  • benzoylurea insecticides
  • high-performance liquid chromatography
  • hyperbranched polyester
  • magnetic solid-phase extraction
  • tea samples

Cite this