Estudo fitoquímico de Myrcia rotundifolia (Berg.) Legrand (Myrtaceae).

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

This work describes the composition of the volatile oils from leaves of Myrcia rotundifolia Berg. and the isolation, identification and structural elucidation of secondary metabolites from organic extracts of stems. M. rotundifolia is a specie found on sand dunes in Parque Metropolitano do Abaeté, Salvador, it has been studied chemically for the first time. After usual chromatographic procedures with hexane extract and dichlorometane phase of the methanol extract were identified squalene, friedelin and arjunolic acid, a mixture of the betulinic acid, lupenone, b-sitosterol and stigmasterol, and a mixture of the lupeol and b-amirin. The identification of the compounds was accomplished by spectral analysis such as 1H, 13C NMR (including DEPT) and mass spectra. The volatile oils were obtained from fresh leaves by hydrodistillation. The leaves were harvested in six different months of the year. The oils were analised by gas chromatography, gas chromatography interfaced with a mass selective detector and by Kovats index calculated by co?injection with a standard saturated n-alkanes homologous series. The results showed small differences in oils composition. The major constituents of the essential oils were the sesquiterpenes a-copaene, b-cariophyllene, germacrene D and d-cadinene.

ASSUNTO(S)

óleos essenciais myrtaceae myrcia esteróides triterpenos quimica

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