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Determination of pesticide residues in Khat leaves by solid-phase extraction and high-performance liquid chromatography
A.N.A. Ali, D. Lemme, T. Jira, , K. Al-Rahwi
Published in
2006
Volume: 3
   
Issue: 1
Pages: 1 - 10
Abstract
The purpose of this investigation is to develop a simple method for the assessment of pesticides in Khat leaves, Catha edulis Forsk. (Celastraceae) shrub, chewed by about 60% of the Yemeni people, producing amphetamine-like psychostimulation. The first procedures involve solid-phase extraction using Adsorbex® RP-C18 and Bakerbond® RP-C18 disposable cartridges with 40% acetonitrile for elution. Isocratic and gradient analysis was carried out by means of high-performance liquid chromatography using different stationary phases to analyse methidathion, peconazole and dimethoate. An Ultrasphere®ODS RP-18-column with UV-detection at 210 nm and 80/20% (v/v) acetonitrile/ water as mobile phase (isocratic) was used to determine the content of methidathion, peconazole and dimethoate (detection limit 20-25 ng). The method was validated with fortified samples at pesticide concentration of 0.1 mg/ml. Average recoveries ranging from 97.9 and 101.6% with a relative standard deviation (RSD) of 1.7-3.8%. Each recovery analysis was repeated four times. Limits of detection ranged from the analytical procedures were applied to 5 samples of khat and no detectable amounts of pesticides were found in any sample under the conditions described. © Copyright 2006 - African. Journal. Traditional, Complementary and Alternative Medicines.
About the journal
JournalAfrican Journal of Traditional, Complementary and Alternative Medicines
ISSN1896016
Open AccessNo
Concepts (6)
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    Catha edulis
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    Dimethoate
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    Khat leaves
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    Methidathion
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    Penconazole
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    Pesticides