New pyridine derivatives and basic components in spearmint oil (Mentha gentilis f. cardiaca) and peppermint oil (Mentha piperita)

The basic fraction of spearmint Midwest Scotch oil (spearmint MWS, Mentha gentilis f. cardiaca) was analyzed by fused silica capillary gas chromatography and mass spectrometric techniques. A total of 38 nitrogen-containing components including 11 new pyridine derivatives, 2-isopropyl-4-methylpyridine, 4-isopropenyl-2-methylpyridine, 2-ethyl-4-isopropenylpyridine, 2-acetyl-4-isopropylpyridine, 2,4-diisopropenylpyridine, 2-acetyl-4-isopropeny1pyridine, 4-acetyl-2-isopropenylpyridine, 5-[(Z)-1-buten-1-yl]-2-propylpyridine, 5-(E)-1-buten-1-yl]-2-propylpyridine, 3-[(Z)-1-buten-1-yl]-4-propylpyridine