New trans–β–bergamotene derivatives in the root and the flower essential oils of Cyanthillium cinereum (L.) H. Rob. from Côte d’Ivoire

Abstract

Root and flower essential oils of Cyanthillium cinereum (L.) H. Rob. (Synonym Vernonia cinerea (L.) Less.) (Asteraceae) collected in Southern Côte d’Ivoire was investigated using a combination of chromatographic and spectroscopic techniques. The root oil composition was dominated by trans–β–bergamotene (20.7%), β–elemene (19.0%), cyperene (10.6%), germacrene A (7.1%) and β–pinene (3.8%), whereas γ–humulene (31.0%), (E)–β–caryophyllene (17.0%), trans–β–bergamotene (7.7%), β–pinene (7.5%) and (E)–β–farnesene (6.0%) were the major components of flower oil. Two new compounds bearing the trans–β–bergamotene framework were identified: trans–β–bergamotenone and (E)–trans–β–bergamotenol.

Graphical Abstract

Keywords:

• Asteraceae
• Cyanthillium cinereum
• Vernonia cinerea
• trans–β–bergamotenone
• (E)–trans–β–bergamotenol
• ¹³C NMR
• essential oil

Acknowledgments

The authors wish to thank Mr Henry Téhé for valuable help in the identification of the plant. BG Boué is grateful to the ‘Ministère de l’Enseignement Supérieur de Côte d’Ivoire’ for providing a research grant. Authors also want to thank Nelly Barat (Robertet SA), for her technical assistance during QTOF-MS analysis.

Disclosure statement

The authors declare no conflicts of interest.