Samples of Hesperozygis ringens (Benth.) Epling and Hesperozygis rhododon Epling essential oils were analyzed by a combination of analytical techniques: capillary gas chromatography, liquid/solid chromatography, GC/MS coupling, and NMR spectroscopy. Twenty-four components have been identified representing altogether more than 95% of the oil content. The oil of H . ringens is constituted mainly by pulegone (79.2%) accompanied by several oxygenated derivatives (pulegone oxides, 1.2%; 8-hydroxy- p -menth-3-one, 1.3%; and 8-hydroxy- p -menth-4-en-3-one, 3.7%); that of H . rhododon contains menthone and pulegone as main compounds in almost comparable amounts (43.4% and 29.6%, respectively). Tests carried out on lettuce seeds using alcoholic extracts of the two species showed significant antigerminating properties mainly for H . ringens . The same activity was observed with its essential oil. Keywords: Hesperozygis ringens (Benth.) Epling; Hesperozygis rhododon Epling; Lamiaceae; essential oil composition; pulegone; menthone
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Poser et al. (1996) studied this question.
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