Pesticide Residue Analysis and Safety
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Abstract
Abstract
Abstract In this paper, we present the development and application of an analytical method for the determination of residues of the systemic, post-emergence herbicide quizalofop-P-ethyl (a.k.a. quizalofop or DPX-79376) and its metabolite quizalofop acid in hemp cannabis matrices via LC-MS/MS. This method was then applied to measure incurred residues of both analytes in samples of hemp grown in the field according to commercial best practices. A total of nine crop matrices were tested: whole seed, fiber, flower buds, hemp hearts, hemp seed oil, hemp meal, hemp flour, ethanol-extracted CBD resin (CBD-E), and supercritical CO2-extracted CBD resin (CBD-C). Processing of the CBD-E and CBD-C crop fractions was carried out in-house. Field sample analysis utilized sequential extractions, stacked solid phase extraction (SPE) column cleanups, conjugate conversion via enzymatic hydrolysis, and evaporation to prepare samples for LC-MS/MS quantitation. Method validations for each fraction were carried out using untreated hemp matrices over a minimum of three levels, with a lowest level of method validation (LLMV) of 0.050 µg/g. Quizalofop-treated samples from ten field sites across viable production regions were collected and analyzed to determine the quizalofop-P-ethyl and quizalofop acid residues within the different hemp matrices. This data was generated in support of nationwide registration with the United States Environmental Protection Agency (USEPA).
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@article{ZunoFloriano2026Determination,
title = {Determination of Quizalofop (DPX-79376) Residues in Hemp Cannabis Matrices by LC-MS/MS},
author = {Fabiola G. Zuno-Floriano and Alexander S. McFall and Matt J. Hengel},
journal = {ACS Agricultural Science & Technology},
year = {2026},
doi = {10.1021/acsagscitech.6c00461},
url = {https://doi.org/10.1021/acsagscitech.6c00461}
}FAQ
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