Seasonal variations of volatile constituents of Hemizygia bracteosa (Benth.) Briq. aerial parts from Benin |
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| Affiliation: | 1. Laboratoire de Chimie Organique Physique et de Synthèse (LaCOPS), Faculté des Sciences et Techniques (FAST), Université d''Abomey-Calavi (UAC), 01 BP: 4166 Cotonou, Bénin;2. Laboratoire de Pharmacognosie et des Huiles Essentielles (LAPHE), Faculté des Sciences de la Santé (FSS), Faculté des Sciences et Techniques (FAST), Université d''Abomey-Calavi (UAC), 01BP: 188 Cotonou, Bénin;3. Pharmacognosy Research Group, Louvain Drug Research Institute, Université catholique de Louvain, B1 7203, avenue Emmanuel-Mounier 72, B-1200 Bruxelles, Belgium;4. Laboratoire d''Écologie Appliquée (LEA), de la Faculté des Sciences Agronomiques (FSA), Université d''Abomey-Calav, 03 BP: 1974 Cotonou, Bénin |
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| Abstract: | Essential oils from fresh aerial parts of Hemizygia bracteosa (Benth.) Briq. were extracted by steam distillation. The oil yield from plants collected during the hot season (February) and during the cold season (August) were 0.12 ± 0.01% and 0.25 ± 0.02%, respectively. GC/FID and GC/MS analyses allowed us to identify a total of 65 compounds, representing 97% of the hydrodistillate. The main components of the oil from the hot period were (E)-β-farnesene (64 ± 0.04%), β-elemene (7.4 ± 0.05%), trans-nerolidol (6.2 ± 0.04%), and α-muurolene (2.7 ± 0.03%). The essential oil from the cold season was characterized by the presence, as major compounds, of (E)-β-farnesene (67 ± 0.04%) along with β-caryophyllene (3.6 ± 0.06%), β-elemene (3.3 ± 0.05%), 7-epi-α-selinene (3.1 ± 0.01%) and p-cymene (2.5 ± 0.04%). This is the first report of these components in the essential oil of Hemizygia bracteosa (Benth.) Briq. |
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| Keywords: | Lamiacea Essential oil composition Seasonal variations β-Elemene. Lamiacea Huile essentielle Variation saisonnière β-élémène |
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