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Updated: May 10, 2025

Analysis of Organochlorine Pesticides in a Soil Sample by a Modified QuEChERS Approach Using Ammonium Formate
Published on: January 20, 2023
Quaternary ammonium compounds in medicinal herbs and health risk assessment
Yasmin S Nasr1, Osama El-Sayed Hussein1, Hassan A El-Gammal1
1Agricultural Research Center, Central Laboratory of Residue Analysis of Pesticides and Heavy Metals in Food (QCAP), Ministry of Agriculture and Land Reclamation, Giza, Egypt.
Abstract:
The rising global demand for medicinal herbs has increased human consumption, raising concerns about potential health risks related to quaternary ammonium compounds (QACs), especially among infants due to frequent use in certain cultures. To perform a market survey, an LC-ESI-MS/MS method was developed to detect five QACs, including Benzalkonium Chlorides (BACs) and Dialkyl Dimethyl Ammonium Chloride (DDAC), in dry medicinal herbs. The method employed QuEChERS extraction with acetonitrile and achieved chromatographic separation with a poroshell C18 column. Method validation was conducted according to Eurachem and SANTE/11312/2021 guidelines, showing high sensitivity and selectivity, with recoveries between 70% and 110% and RSDs below 5%. The method was applied to market samples, resulting in 33% exceedances of the maximum residue limits. In this study also dietary exposure risks for adults, toddlers and infants were evaluated. Preliminary risk assessment indicated acceptable dietary exposure risks.
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