Contribuição ao estudo de espécies da família Rubiaceae: gênero amaioua
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2014-03-07
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Universidade Federal de Goiás
Resumo
The Amaioua genus (Rubiaceae) is included in the subfamily Ixoroideae. The
genus comprises 10 species, ranging from Panama to Peru, Venezuela and Brazil, and
four of these species are found in Cerrado (DELPRET et al., 2004b). There are no
records in the literature on the popular use of the Amaioua genus. Amaioua guianensis
Aulb is a shrub up to 3 m or a 10-20 m tree, popularly known as marmelada-brava ou
marmelinho-vermelho. Phytochemical studies of leaves and twigs of this species led to
the isolation of several classes of secondary metabolites, such as coumarins, a
cyclopeptide alkaloid, pentacyclic triterpenes, proanthocyanidins and chlorogenic acids
(OLIVEIRA,2009).
Amaioua intermedia Mart, popularly known as carvoeiro, pau-carvão, cinzeiro,
canela-de-veado, guapeva-forte or marmelada-brava, presents itself as shrubs up to 3 m
or 15 m trees. Until the moment there are no records in the literature about a
phytochemical study of A. intermedia,. As part of our phytochemical research for new
compounds from higher plants, we studied the ethanolic extracts of A. guianensis and A.
intermedia, and evaluated the antioxidant activity of such extracts and fractions
obtained from them. Herein we describe the isolation and structural elucidation of a new
kaurane diterpene (compound 8), a new cyclopeptide alkaloid (compound 19), two new
secologanin iridoid (compounds 24 and 25, and seventeen known compounds: a
cyclopeptide alkaloid (compound 7), five iridoids (compounds 1, 13, 14, 15 and 16), a
ent-kaurane diterpene (compound 22), two dimeric proanthocyanidins (compounds 11
and 12), three pentacyclic triterpenes (compounds 9, 20 and 21), a sugar (compound 10)
and four steroids (compounds 3, 4, 5 and 6).
The antioxidant activity analysis of the raw extracts obtained from fruits, roots,
leaves and twigs of A. guianensis, as well as the raw extracts from the leaves and twigs
of A. Intermedia, showed that they reacted to the DPPH radical, leading to a loss of 50%
in its absorbance, on the following concentrations of 71.87, 7.55, 5.30, 7.48, 46.83 and
57.42 mg/mL.
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OLIVEIRA, Pollyanna Laurindo. Contribuição ao estudo de espécies da família Rubiaceae: gênero amaioua. 2014. 274 f. Tese (Doutorado em Química) - Universidade Federal de Goiás, Goiânia, 2014.