Avaliação da atividade antibacteriana e triagem fitoquímica das folhas de Acacia longifolia (Andr.) Willd. (Leguminosae)

Abstract

Evaluation of the antibacterial activity and phytochemical screening of the leaves of Acacia longifolia (Andr.) Willd., Leguminosae. The antibacterial activity of the extracts of Acacia longifolia (Andr.) Willd. leaves was evaluated by the gel diffusion method. The extracts were incorporated in paper discs and it was verified the effect on the human pathogenic bacteria growth. The tested bacteria were Staphylococcus aureus (ATCC 6538), Escherichia coli (ATCC 11129) and Pseudomonas aeruginosa (ATCC 9027). The crude ethanolic extract, the ethyl acetate and the remained ethanolic fractions showed growth inhibition of S. aureus, only the crude ethanilic extract showed, in lower extension, growth inhibition of P. aeruginosa and no growth inhibition at all of E. coli. The phytochemical screening indicated the presence of tannins, leucoanthocianidins, flavonoids and triterpene/steroids.

Potentiation of antibiotic activity by Passiflora cincinnata Mast. front of strains Staphylococcus aureus and Escherichia coli

“…The antagonistic effect observed with the extracts of stems, epicarp and seeds, when combined with ampicillin, can be explained by the mixture of compounds present in crude extracts, which contain higher amounts of metabolites capable of decreasing the effects of active substances (Peitz et al, 2003).…”

Determining the genotoxicity of an aqueous infusion of Bauhinia monandra leaves

“…The knowledge of the components of a plant from phytochemical selection helps the understanding of its action and its adverse reactions (Andrade et al, 2005;Peitz et al, 2003;Mariz et al, 2006;Carlos et al, 2005). Phytochemical studies of Bauhinia genus confi rm the presence of various isolated and identifi ed compounds, including lactones, fl avonoids, terpenoids, glycolipids, steroid glycosides, steroids, tannins and quinines (Cechinel-Filho et al, 1996, Silva et al, 2000Mendes et al, 2006).…”

Determinação do conteúdo fenólico e avaliação da atividade antioxidante de Acacia podalyriifolia A. Cunn. ex G. Don, Leguminosae-mimosoideae

“…Estudos quimiotaxonômicos relacionam o gênero Acacia como reconhecida fonte de substâncias fenólicas Silva, 1993;Andrade et al, 2003;Pansera et al, 2003), os quais apresentam uma grande variedade de ações biológicas (Duroux et al, 1998;Peitz et al, 2003), dentre elas a atividade antioxidante.…”