Determination of Chlormequat in Pears by Liquid Chromatography/Mass Spectrometry

Authors: Mol, Hans G.J.; Dam, Ruud C.J. Van; Vreeken, Rob J.; Steijger, Odile M.

Source: Journal of AOAC International, Volume 83, Number 3, May 2000 , pp. 742-747(6)

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Abstract:

A straightforward and reliable method was developed for the determination of chlormequat in pears by liquid chromatography/mass spectrometry (LC/MS). Water and methanol were compared as extraction solvents. Because no significant differences in extraction efficiency or repeatability were found, water was chosen as the extraction solvent. The extracts were analyzed without cleanup by either an ion-trap liquid chromatograph/mass spectrometer in the single MS mode or a triple-quadrupole instrument in the MS/MS mode, using electrospray ionization. Both instruments were equally suitable for quantitation and confirmation of identity. Recoveries were 76-103%, and reproducibility was ≤12%. The lowest detection limit (0.007 mg/kg) was obtained with the triple-quadrupole instrument in the MS/MS mode.

Document Type: Research article

Affiliations: 1: TNO Nutrition and Food Research Institute, Department of Pesticides, PO Box 360, 3700 AJ Zeist, The Netherlands.

Publication date: 2000-05-01

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The Journal of AOAC INTERNATIONAL publishes refereed papers and reviews in the fields of chemical, biological and toxicological analytical chemistry for the purpose of showcasing the most precise, accurate and sensitive methods for analysis of foods, food additives, supplements and contaminants, cosmetics, drugs, toxins, hazardous substances, pesticides, feeds, fertilizers and the environment available at that point in time. The scope of the Journal includes unpublished original research describing new analytical methods, techniques and applications; improved approaches to sampling, both in the field and the laboratory; better methods of preparing samples for analysis; collaborative studies substantiating the performance of a given method; statistical techniques for evaluating data. The Journal will also publish other articles of general interest to its audience, e.g., technical communications; cautionary notes; comments on techniques, apparatus, and reagents.
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Determination of Chlormequat in Pears by Liquid Chromatography/Mass Spectrometry

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