Estudo químico e biológico de espécies de croton (euphorbiaceae) nativas do Rio Grande do Sul / Chemical and biological study of species of croton (Euphorbiaceae) native of Rio Grande do Sul

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

2011

RESUMO

The family Euphorbiaceae has been highlighted by the production of compounds of industrial interest and importance for the food. Several representatives species are of interest due to production of volatile oils. Examples are species of Croton that have medicinal properties, such as anti-inflammatory, antifungal, antimicrobial and healing. Some species of the genus Croton, widely distributed in Rio Grande do Sul, were investigated in order to analyze the chemical composition of volatile oils obtained by hydrodistillation from the aerial parts of the plants. Three species were collected in different localities of Rio Grande do Sul, Croton pallidulus, C. isabelli and C. ericoides. The chemical composition of the oils was analyzed using gas chromatography coupled to mass spectrometry. Sesquiterpenes and Monoterpenes were the major compounds identified in the oils of C. pallidulus, C. isabelli and C. ericoides. Additionally, the volatile oils obtained from each species were tested for amebicidal activity against Acanthamoeba polyphaga. Both the volatile oil of C. pallidulus and that of C. ericoides showed activity against A. polyphaga, but the latter was more active: the concentration of 0.5 mg/mL, was able to kill 87% of trophozoites, while the oil of C. pallidulus, at the same concentration, killed only 29% of trophozoites. The volatile oil of C. isabelli was the one that showed less activity; in a concentration of 10 mg/mL, the oil killed only 4% of trophozoites. The volatile oils of the three species showed a cytotoxic effect in VERO cells determined by the MTT method. The oil of C. ericoides, the most active against the Acanthamoeba, presented also the highest cytotoxicity. .In addition, the volatile oils of C. pallidulus and C. ericoides were assayed for antibacterial activity against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa using the bioautography method. It was found that the oils of C. pallidulus and C. ericoides inhibited the growth of E. coli and S. aureus. With respect to P. aeruginosa no inhibition of bacterial growth by both species of Croton was observed.

ASSUNTO(S)

volatile oils plantas medicinais croton euphorbiaceae euphorbiaceae oleos volateis amebicidal atividade antibacteriana antibacterial

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