Essential oils from fresh leaves of Piper gaudichaudianum and P. mikanianum, collected in South Brazil, which were obtained by hydrodistillation, were analyzed by GC and GC/MS. Forty-one compounds representing 94.4–95.1% of the oils were identified. P. gaudichaudianum showed small amounts of monoterpenes: among them, β-pinene and linalool were the most abundant. Considerable amounts of sesquiterpenes were present, particularly α-humulene (37.5%) and β-caryophyllene (17.4%). P. mikanianum showed a higher diversity of constituents, of which limonene (14.8%), bicyclogermacrene (14.3%) and β-caryophyllene (10.5%) were the major components.
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Poser et al. (1994) studied this question.
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