Pyridine Derivatives in Peppermint Oil

Volatile Compounds and Sensory Analysis of Both Harvests of Double‐Cut Yakima Peppermint (Mentha piperita L.)

“…From the in‐depth analysis of these 4 peppermint oils, 177 components were identified as being present (Figure 1, Table 2), including many trace components. This reported composition is in agreement with the previous literature (Sakurai and others 1983; Ishihara and others 1992; Näf and Velluz 1998; Gaudin, 2000; Frérot and Bagnoud 2002, 2004). Certain trends were observed between the 1st‐ and 2nd‐cut oils and also the fresh leaves and dried hay oil analyses.…”

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

“…Pyridine and five other derivatives, 2,6-dimethylpyridine, 5-ethyl-2-methylpyridine, 3-phenylpyridine, 3-phenyl-4-propylpyridine, and 5-phenyl-2-propylpyridine, had been already identified as the basic components of Mitcham peppermint oil (Takahashi et al, 1980;Sakurai et al, 1983). It is also reported that phenylpyridine derivatives have very strong characteristic odors and are representative of an odor profile of the basic fraction of peppermint oil.…”

“…4-Isopropyl-2-methylpyridine was prepared according to the method of Comins and Abdullah (1982) in 52% yield. The spectral data were as follows: RI = 1059; IR (film) 3080, 3030, 2975,1603,1560,920,830 cm"1; NMR (CDC13) 1.20 (d, «7 = 7 Hz, 6 H, two CH3), 2.47 (s, 3 H, CH3), 2.79 (dq, «7=7 and 7 Hz, 1H, CH), 6.84 (d, «7 = 5 Hz, , H), 6.87 (s, , H), 8.25 (d, «7 = 5 Hz, 1H, Ar H); EI-MS m/z (relative intensity) 135 (M+, 64), 120 (100), 106 (4), 93 (6), 77 (13), 65 (5), 42 (6), 41 (6). 3-Phenyl-4-propylpyridine was prepared from 3-phenylpyridine and butyric acid according to the modified method of Minisci et al (1971), and it showed the same physicochemical properties as those reported by Sakurai et al (1983).…”

“…5-Phenyl-2-propylpyridine was prepared according to the method of Sakurai et al (1983), and it showed the same physicochemical properties as those reported.…”

“…It is produced mainly in the northwestern and midwestern states of the United States. Although approximately 200 components have been identified from the neutral and acidic parts of spearmint oil (Smith et al, 1963; Nigam and Levi, 1963;Canova, 1971;Tsuneya et al, 1973; Surberg and Kopsel, 1989; Shimizu et al, 1990), there has been only one published study on the basic fraction, from which three pyridine compounds, 3-phenylpyridine, 5phenyl-2-propylpyridine, and 3-phenyl-4-propylpyridine, were identified in the basic fractions of Midwest Scotch spearmint oil and peppermint oil (Sakurai et al, 1983). The nitrogen compounds seem to greatly contribute to the characteristic odor profile of the spearmint oil because of their powerful and pungent aromas.…”