
Certain factors may influence the special metabolite production in plants. Leaves of Byrsonima verbascifolia (MALPIGHIACEAE) were collected during different seasons and times of day, to determine the concentration and chemical composition of volatile oils. Chemical analysis indicated that oxygenated sesquiterpenes were the most concentrated, and oxygenated monoterpenes were the least concentrated. The primary components of the essential oil were pentacosane (2.747 to 9.613%), spathulenol (3.398 to 10.552%), and benzene-1,2-dicarboxylic acid diethyl ester (3.861 to 15.307%). Seasonal and circadian variations did not influence the essential oil content. However, the essential oil’s chemical composition was influenced by seasonal variation, among them the spathulenol. Key words: Murici, seasonality, circadian variation, terpens, leafs.
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