Essential oils in aerial parts of Myrcia tomentosa: composition and variability
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Data
2012-12
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Resumo
Species in the Myrtaceae family are used in folk medicine to treat
gastrointestinal disorders, infectious diseases and hemorrhagic conditions and are known
for their essential oil contents. Gas chromatography coupled with mass spectrometry
(GC-MS) was used to characterize the chemical composition of essential oils of the
leaves, stem bark and fl owers of Myrcia tomentosa (Aubl.) DC., as well as to assess
the chemical variability in the constituents of the essential oils of the leaf. Soil and
foliar analyses were also performed to determine the mineral compositions. Principal
component analysis (PCA) was used to examine the interrelationships between the
obtained data. The most abundant component in the essential oils of the fl owers was
(2E,6E)-methyl farnesoate, whereas hexadecanoic acid was the most abundant essential
oil component in the stem bark. The leaf essential oils showed seasonal variation in
their chemical composition, with bicyclogermacrene and (2E,6E)-methyl farnesoate as
the major chemical components. Forty-four constituents were identifi ed, and only nine
compounds were found in all of the samples. Sesquiterpenes were mainly produced in
the fl owers and leaves. The PCA showed a positive correlation between the oxygenated
sesquiterpenes and the foliar nutrients Cu and P. Signifi cant statistical correlations were
verifi ed between the climatic data, foliar nutrients and essential oil compositions.
Descrição
Palavras-chave
Bicyclogermacrene, PCA, Goiaba-brava, Myrtaceae, Seasonality
Citação
Sá, Fabyola A. S. et al. Essential oils in aerial parts of Myrcia tomentosa: composition and variability. Revista Brasileira de Farmacognosia , Curitiba, v. 22, n. 6, p. 1233-1240, Nov./Dec. 2012.