New pyridine derivatives and basic components in spearmint oil (Mentha gentilis f. cardiaca) and peppermint oil (Mentha piperita)
Ishihara, M. | Tsuneya, T. | Shiga, M. | Kawashima, S. | Yamagishi, K. | Yoshida, F. | Sato, H. | Uneyama, K.
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-isopropenylpyridine, 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, and 3-[(E)-1-buten-1-yl]-4-propylpyridine, were identified by comparison of their spectroscopic data with those of synthetic samples. Among them, 2-acetyl-4-isopropenylpyridine is a major component and has a powerful grassy-sweet and minty odor. The typical basic components in spearmint oil were compared with those of peppermint oil. Odor profiles of 15 pyridine derivatives were also described.
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