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Simple ion chromatographic method for the determination of chlormequat residues in pears |
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| Authors: | Marie-Christine Peeters Isabelle Defloor Jozef Coosemans Jan A Delcour Lut Ooms Rik Deliever Dirk De Vos |
| Institution: | a Teaching Support Unit, Faculty of Agricultural and Applied Biological Sciences, Katholieke Universiteit Leuven, Kasteelpark Arenberg 21, B-3001 Leuven, Belgium b Laboratory of Phytopathology and Plant Protection, Faculty of Agricultural and Applied Biological Sciences, Katholieke Universiteit Leuven, W. De Croylaan 42, B-3001 Heverlee, Belgium c Laboratory of Food Chemistry, Faculty of Agricultural and Applied Biological Sciences, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20, B-3001 Leuven, Belgium d Centre for Surface Chemistry and Catalysis, Faculty of Agricultural and Applied Biological Sciences, Katholieke Universiteit Leuven, Kasteelpark Arenberg 23, B-3001 Leuven, Belgium |
| Abstract: | Current methods for quantitative determination of chlormequat residues in food crops are characterized by rather low recoveries and the need for derivatization (in case of gas chromatography, GC), or by high capital investment (in case of liquid chromatography–mass spectrometry, LC–MS). We propose a cation-exchange chromatography method for the analysis of chlormequat in pears. The method is based on extraction of the target compound with 40 mM HCl, followed by centrifugation and filtration. The filtrate is directly injected into an ion chromatograph equipped with a commercially available cation-exchange column and a suppressed conductivity detection system. While the limit of detection (LOD) (0.5 mg/kg) may not be small enough to allow dietary analysis, the method meets all validation requirements and is an alternative for the existing GC and LC–MS methods in quality control. |
| Keywords: | Chlormequat Pesticides Quaternary ammonium compounds |
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