Example 2. In another study conducted by Vaysse and coworkers,
twenty herbal medicines or dietary supplements
marketed as natural slimming products were analysed by diffusion
ordered spectroscopy (DOSY), 1H-nuclear magnetic resonance
(NMR) and DOSY–COSY 1H-NMR.64 Of the twenty,
fourteen had been adulterated: eight contained sibutramine
alone, five contained sibutramine plus phenolphthalein, and one
contained synephrine. The substances were quantified with 1HNMR,
and DOSY NMR was considered a useful tool for the
detection of unexpected adulteration.