Journal
FOOD CHEMISTRY
Volume 145, Issue -, Pages 853-858Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2013.08.137
Keywords
Magnetic multiwalled carbon nanotubes; Gas chromatography-mass spectrometry; Cleanup; Tea samples; Pesticide residues
Funding
- Independence Innovation Foundation of Tianjin University [130-60302010]
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In this work, amine-functionalised magnetic nanoparticles and multiwalled carbon nanotubes (MNPs/MWCNTs) composites were synthesised by a simple method and applied as an adsorbent for rapid clean-up of acetonitrile extracts of tea samples prior to analysing eight pesticide residues by gas chromatography-mass spectrometry. Several parameters affecting the sampling and treatment efficiency were investigated, including extraction solvent, sonication time, weight ratio of MWCNTs to MNPs in the composites, amount of adsorbent, clean-up time and washing solution. Under the optimised conditions, the recoveries obtained for each pesticide ranged from 72.5% to 109.1% with relative standard deviations lower than 12.6%. Limit of quantification ranged from 0.02 to 0.08 mg kg(-1). The established method was successfully applied to the analysis of pesticide residues in real tea samples. The results indicated that the use of MNPs/MWCNTs composites allowed the simple and expeditious clean-up of complex tea samples for subsequent determination of pesticide residues. (C) 2013 Elsevier Ltd. All rights reserved.
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