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Type: Artigo de periódico
Title: Fiber introduction mass spectrometry: determination of pesticides in herbal infusions using a novel sol-gel PDMS/PVA fiber for solid-phase microextraction
Author: da Silva, RC
Zuin, VG
Yariwake, JH
Eberlin, MN
Augusto, F
Abstract: An application of the direct coupling of solid-phase microextraction (SPME) with mass spectrometry (MS), a technique known as fiber introduction mass spectrometry (FIMS), is described to determine organochlorine (OCP) and organophosphorus (OPP) pesticides in herbal infusions of Passiflora L. A new fiber coated with a composite of poly(dimethylsiloxane) and poly(vinyl alcohol) (PDMS/PVA) was used. Sensitive, selective, simple and simultaneous quantification of several OCP and OPP was achieved by monitoring diagnostic fragment ions of m/z 266 (chlorothalonil), m/z 195 (alpha-endosulfan), m/z 278 (fenthion), m/z 263 (methyl parathion) and m/z 173 (malathion). Simple headspace SPME extraction (25 min) and fast FIMS defection (less than 40 s) of OCP and OPP from a highly complex herbal matrix provided good linearity with correlation coefficients of 0.991-0.999 for concentrations ranging from 10 to 140 ng ml(-1) of each compound. Good accuracy (80 to 110%), precision (0.6-14.9%) and low limits of detection (0.3-3.9 ng ml(-1)) were also obtained. Even after 400 desorption cycles inside the ionization source of the mass spectrometer, no visible degradation of the novel PDMS/PVA fiber was detected, confirming its suitability for FIMS. Fast (ca 20 s) pesticide desorption occurs for the PDMS/PVA fiber owing to the small thickness of the film and its reduced water sorption. Copyright (c) 2007 John Wiley & Sons, Ltd.
Subject: solid-phase microextraction (SPME)
fiber introduction mass spectrometry (FIMS)
PDMS/PVA fibers
Passiflora L. infusion
Country: Inglaterra
Editor: John Wiley & Sons Ltd
Citation: Journal Of Mass Spectrometry. John Wiley & Sons Ltd, v. 42, n. 6, n. 825, n. 829, 2007.
Rights: fechado
Identifier DOI: 10.1002/jms.1223
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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