Chemical Composition of Essential Oils of Three Species of the Genus Bocageopsis (Annonaceae) Amazon Region

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The essential oils (EO) of three species of Bocageopsis (B. canescens, B. pleiosperma, and B. multiflora) were investigated by gas chromatography coupled to mass spectrometry (GC/MS), revealing the presence of sesquiterpenes and their derivatives. The leaves of two individuals with different stages of development of B. canescens species were analyzed, being identified in the bigger and, consequently, older individual, germacrene D (19.5%), (E)-caryophyllene (14.8%), bicyclogermacrene (9.7%), d-elemene (8.5%), and b-elemene (8.3%) as main constituents. In the younger and smaller individual, oxygenated sesquiterpenes were predominant: spathulenol (24.1%), caryophyllene oxide (9.8%), and isospathulenol (8.5%), besides the sesquiterpene (E)-caryophyllene (13,6%). The main constituents of the twig from the older individual were sesquiterpenes: -muurolol (40.0%) and b-acorenol (16.0%). On the other hand, in the species B. multiflora, the main constituents in the EO extracted from the leaves were spathulenol (35.14%) and -trans-bergamotene (31.23%). The main compounds in the branches were -trans-bergamotene (25.32%), b-selinene (19.57%), and -gurjunene (15.42%). The sesquiterpenes b-selinene (28.16%) and -trans-bergamotene (21.92%) were predominant in the twig b-bisabolene was the main constituent in the leaves (89.64%) and twig (33.75%) of B. pleiosperma species, being also observed a significant presence of bisabolene derivative cryptomerione (25.76%) in the twig. These results represent the first report on the chemical composition of the species B. canescens from the Amazon region.