Sesquiterpene Alcohols in the Essential Oils of Mentha aguatica L. and Mentha piperita L.

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Viridiflorol, mp. 70-72℃, [α]¹⁵D + 4.81°, a sesquiterpene alcohol of allo-aromadendrene skeleton, has been isolated from the essential oils of a strain of Mentha aquatica and Mentha piperita. By comparing the IR spectrum of our sample with that of ledol isolated by Dr. Naves from a carqueja oil, it was confirmed that our viridiflorol isolated from the Mentha oils did not contain ledol, an epimer of viridiflorol, though ledol had been reported in an American peppermint oil. The content of viridiflorol and other terpenes in our aquatica oil was estimated by gas chromatography using a column (PEG-20M). The results were shown as follows : viridiflorol (7.0%), β-pinene (21.2), limonene (15.6), isopinocamphone (27.8), elemene (3.5), carvone (4.2), and elemol (4.1). Furthermore, viridiflorol in the following oils of the Genus Mentha was estimated by the internal standard method : a Japanese strain of M. piperita (M-4), 0.28 %; three American peppermint oils, 0.16-0.12%; an American spearmint oil, less than 0.01% and a Japanese arvensis oil (de-mentholized oil), less than 0. 01 %. These results are seemed to be noteworthy for chemotaxonomical and genetical studies, since it has been suggested by cyto-genetical method that piperita wasoriginated from the crossing between aquatica and spicata.
信州大学農学部の論文
1976-06-25