- Essential oil composition and allelopathic effect of the Brazilian lamiaceae Hesperozygis ringens (Benth.) epling and Hesperozygis rhododon epling
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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.
- Von Poser, Gilsane L.,Menut, Chantal,Toffoli, Maria E.,Verin, Pierre,Sobral, Marcos,Bessiere, Jean-Marie,Lamaty, Gerard,Henriques, Amelia T.
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p. 1829 - 1832
(2007/10/03)
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- Biotransformation of terpenic compounds by fungi. I. Metabolism of R-(+)-pulegone
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R-(+)-Pulegone 1 is converted by several fungal strains to new regioselectively hydroxylated compounds. Epoxidation of the double bond does not seem to be responsible for the main observed hydroxylation pattern.
- Ismaili-Alaoui,Benjilali,Buisson,Azerad
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p. 2349 - 2352
(2007/10/02)
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