1-Octyl-3-methylimidazolium hexafluorophosphate-functionalised magnetic poly β-cyclodextrin for magnetic solid-phase extraction ofpyrethroids from tea infusions

ABSTRACT

In this study, a novel sorbent, 1-octyl-3-methylimidazolium hexafluorophosphate functionalised magnetic poly β-cyclodextrin, was successfully synthesised and applied to magnetic solid-phase extraction for the determination of pyrethroids in tea infusions. The sorbent was characterised by transmission electron microscopy, energy-dispersive spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, vibrating sample magnetometer and Brunauer–Emmett–Teller measurement. All factors affecting extraction efficiency, such as sorbent amount, extraction time, ionic strength and desorption conditions, were optimised individually. Under the chosen conditions, wide linearity (2.5–500 μg L⁻¹) with determination coefficients ranging from 0.9995 to 0.9999, low limits of detection of 0.32–0.54 μg L⁻¹ and good precision (intra-day: 2.6–7.0%; inter-day: 3.5–7.6%) were achieved for four pyrethroids in tea infusions. The relative recoveries of target analytes in real tea infusion samples were from 70% to 101% with relative standard deviations lower than 9.1%. We conclude that the proposed method is promising in the detection of pyrethroids in tea infusions.

KEYWORDS:

• 1-octyl-3-methylimidazolium hexafluorophosphate
• poly β-cyclodextrin
• pyrethroids
• magnetic solid-phase extraction
• tea infusions

Disclosure statement

No potential conflict of interest was reported by the author(s).

Ethical approval

This article does not include any studies with human participants or animals performed by any of the authors.

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Additional information

Funding

This work was supported by the National Key R&D Programme of China (Project Nos. 2018YFC1604402), the National Natural Science Foundation of China (Project Nos. 21677174, 21277172 and 21507159).