The essential oils of Mentha rotundifolia and Mentha longifolia were analyzed with GC and GC/MS. The major components were rotundifolone (10.4%) and piperitol (57.6%) in M. rotundifolia , and rotundifolone (33.2%) and diosphenol (47.7%) in M. longifolia. M. longifolia essential oil exhibited a stronger CNS depressant effect than that of M. rotundifolia ; both essential oils were somnifacients.
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Raya et al. (1990) studied this question.
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