Résumé
The presence on the market of illegal products for slimming purposes or the treatment of obesity is a public health issue. These products may illicitly contain chemicals in order to improve their effectiveness. Some of these weight loss compounds are responsible for adverse events including fatal outcomes. A general strategy for the analysis of any suspect formulation begins with a large screening for the general search of a wide range of compounds. A methodology for the qualitative and quantitative determination of 34 compounds in slimming preparations (such as dietary supplements or medicinal products) was used for the control of slimming formulations from the market, including over the internet. The fast liquid chromatography system (UHPLC) used a gradient of solvent (phosphate buffer and acetonitrile), a C18 endcapped column and a diode array detector. This system allows dual identification based on retention time and UV spectra. The analytical method is simple, fast and selective since 34 weight-loss compounds can be detected in a 15 minutes run time. Thus, 32 commercial slimming formulations were analysed using this method, allowing the detection and quantification of hazardous active substances: caffeine, clenbuterol, nicotinamide, phenolphthalein, rimonabant, sibutramine, N,N-didesmethylsibutramine, synephrine and yohimbine.