Investigation of Variability in the Matrix Effect on Stable Isotope-labeled Internal Standards in Liquid Chromatography-tandem Mass Spectrometry Analysis of 25 Pesticides in Vegetables

Overview

Journal J Pestic Sci

Date 2024 Jun 17

PMID 38882703

Authors

Arisa Banno

Yoshinori Yabuki

Motohiro Sonoda

Shinji Tanimori

Affiliations

Soon will be listed here.

Abstract

The matrix effects (ME) in simultaneous analysis of pesticide residue using liquid chromatography-tandem mass spectrometry (LC-MS/MS) were evaluated by comparing the slopes of matrix-matched and reagent-only calibrations of four types of vegetable samples. Both the sampling and measurement variances of the ME were also determined using one-way analysis of variance. Substantial ion suppression (ME<-20%) was observed in komatsuna, spinach, and tomato when a modified Japanese official method was implemented. The ME magnitude varied significantly due to sample variability for some pesticides, but it varied by no more than 4% as a result of analytical procedure variance. This study also showed that the addition of stable isotope-labeled internal standards at low concentrations improved the recovery of pesticides from samples at various residue levels. The findings of this study highlight the importance and practical application of internal standards and the matrix-matched calibration method in residue analysis using LC-MS/MS.

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