WITHDRAWN: Green method for the analysis of nitenpyram and pymetrozine in tea

Abstract

Nitenpyram and pymetrozine are widely used polar pesticides as well as in tea cultivation. More costly and toxic organic reagents were involved in the present detection methods. There is a continuing search for more eco-friendly methods. An eco-friendly approach was established and optimized to analyze the presence of two hydrophilic insecticides including nitenpyram and pymetrozine in tea. The method involved the use of boiling water instead of organic solvent, followed by PCX solid phase extraction (SPE) cleanup and determination with ultra-high-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). On average 83.2–98.8% of nitenpyram and pymetrozine were recovered from tea with relative standard deviations (RSDs) below 7%. The limits of quantification (LOQs) were 0.025 mg·kg-1. This organic solvent-saving approach offers a reliable and effective alternative for detecting nitenpyram and pymetrozine from tea samples, which can serve as a practical tool for tea safety and market supervision.