INFLUÊNCIA DA SAZONALIDADE E DO RITMO CIRCADIANO NO TEOR E COMPOSIÇÃO QUÍMICA DO ÓLEO ESSENCIAL DE FAVEIRA (Dimorphandra mollis Benth.)

Abstract

Some factors can influence the production of secondary metabolites by the plant, with terpenes being the components of volatile oils most found in various parts of plants. The objective of this work was to verify the percentage and chemical composition of volatile oil extracted from beech leaves (Dimorphandra mollis Benth.), Collected at different times and seasons, to evaluate the circadian and seasonal variation in the content and composition of these oils. The essential oil was obtained by hydro distillation in Clevenger and analyzed by CG / MS. Chemical analyzes indicated a predominant concentration of oxygenated sesquiterpenes and a lower concentration of hydro carbonated monoterpenes. The major component of essential oil was represented by the compound (Z.Z) -farnesol (7.454 to 27.365%). There was no influence of the circadian variation on the EOC, however there was seasonal influence, with an effect of the interaction of the times within the collection times, as well as an isolated effect of the time, which allowed the identification of the best time for the collection of leaves for extraction, for the conditions found in the municipality of Rio Verde - GO. Regarding the classes of terpenes, there was no effect of the circadian variation on the concentrations of OM, OS, HS and other constituents, except for HM. However, there was seasonal variation, making it possible to identify the spring season with the highest concentration of the major compound (ZZ) -farnesol belonging to the group of oxygenated sesquiterpenes, which were in greater concentration in spring and summer, while the oxygenated monoterpenes reached higher concentrations in autumn and winter, hydro carbonated sesquiterpenes did not change during the studied periods.