Dresden 2011 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 9: Ion Trap and FT-ICR-MS, Molecules, Clusters and Reactions

MS 9.6: Vortrag

Freitag, 18. März 2011, 12:00–12:15, GÖR 229

Rapid screening of pesticides from fruit surfaces by means of laser desorption ion mobility spectrometry — Sven Rötering¹, Helko Borsdorf², Christian Weickhardt¹, and •Andreas Seidler¹ — ¹Leipzig University of Applied Sciences, Leipzig, Germany — ²Helmholtz Centre for Environmental Research - UFZ, Leipzig, Germany

Multi residue analysis of pesticides in fruits and vegetables is complicated because a large number of substances belonging to multiple groups of chemicals with different features are used. Standard analysis of pesticide residues is carried out by gas chromatography or HPLC coupled to mass spectrometry. These methods require time consuming pre-treatments. Consequently, at the time the analysis results are available, fruits or vegetables are either eaten or no longer suitable for consumption.

A promising approach for a rapid and inexpensive screening technique is a combination of laser desorption and ion mobility spectrometry.

Pesticides are desorbed from the fruit skin by interaction with a laser pulse. By means of a gas flow the desorbed molecules are transferred into an ion mobility spectrometer where they are identified and quantified. The results are available within seconds and the technique is applicable to many different pesticides representing insecticides and fungicides.

The report illustrates the set-up of the coupling and shows first results obtained for 26 pesticides detected on different fruit skins.