RESUMO
The chemical composition of leaf essential oil from Artabotrys insignis Engler & Diels collected from Cote d'Ivoire was determined by GC(FID), GC-MS and 13C NMR. The main compounds were ß-elemene (66.8%) and germacrene A (17.1%). The true content of germacrene A/ß-elemene was obtained by combining GC(FID) and 13C NMR data.
Assuntos
Annonaceae/química , Óleos Voláteis/química , Sesquiterpenos de Germacrano/análise , Sesquiterpenos/análise , Espectroscopia de Ressonância Magnética Nuclear de Carbono-13 , Côte d'Ivoire , Cromatografia Gasosa-Espectrometria de Massas , Óleos Voláteis/análise , Folhas de Planta/químicaRESUMO
ABSTRACT One oil sample isolated from leaves of Artabotrys jollyanus Pierre, Annonaceae, from Côte d'Ivoire has been analyzed by GC(RI), GC-MS and 13C NMR. In total, thirty-seven compounds accounting for 96.9% of the relative composition have been identified. The composition of the essential oil was dominated by trans-calamenene (15.7%), α-copaene (14.8%), α-cubebene (10.4%), cadina-3,5-diene (10.3%), (E)-β-caryophyllene (6.3%) and cadina-1,4-diene (6.1%). 13C NMR spectroscopy was very useful in the identification of trans-calamenene, 7-hydroxycalamenene, cadina-3,5-diene and cadina-1,4-diene. Moreover, monitoring the evolution of the leaf essential oil composition and the yield on a 12-month period (one sample per month) was achieved. The twelve essential oil samples exhibited a chemical homogeneity but the yield varied from sample to sample (0.26-0.60%).