the UV-chromatographic profile of the rosemary extract. The peaks 1 and 2 eluting at 1.95 and 2.96 min exhibit spectral features characteristic of carnosol and carnosic acid, respectively. The MSchromatographic profiles unambiguously confirm the presence of
carnosol and carnosic acid. Indeed, the MS spectrum of the pic eluting at 1.99 min exhibits a pseudo-molecular ion [M+ H +] with an m/z = 331.19, while the theoretical mass for the [M+ H +] of carnosol is 331.1909 amu. In the same way, the MS spectrum of the pic eluting at 3.04 min exhibits a pseudo-molecular ion [M+ H +] with an m/z = 333.20, while the theoretical mass for the [M+ H +] of carnosic acid is 333.2066 amu. The pic at m/z = 287.20 amu is attributed to the loss of a formic acid molecule.