Fiber introduction mass spectrometry: Determination of pesticides in herbal infusions using a novel sol-gel PDMS/PVA fiber for solid-phase microextraction

Research output: Journal contributionsJournal articlesResearchpeer-review

Authors

  • Rogério Cesar Da Silva
  • Vânia Gomes Zuin
  • Janete Harumi Yariwake
  • Marcos Nogueira Eberlin
  • Fabio Augusto

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 (α-endosulfan), m/z 278 (fenthion), m/z 263 (methyl parathion) and m/z 173 (malathion). Simple headspace SPME extraction (25 min) and fast FIMS detection (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.

Original languageEnglish
JournalJournal of Mass Spectrometry
Volume42
Issue number10
Pages (from-to)1358-1362
Number of pages5
ISSN1076-5174
DOIs
Publication statusPublished - 10.2007
Externally publishedYes

    Research areas

  • Fiber introduction mass spectrometry (FIMS), Passiflora L. infusion, PDMS/PVA fibers, Pesticides, Solid-phase microextraction (SPME)
  • Chemistry

DOI