The antibacterial effects of an aqueous extract of yerba-mate (Ilex paraguariensis) leaves and twigs on pathogenic bacteria
DOI:
https://doi.org/10.31416/rsdv.v12i3.997Palavras-chave:
Ilex paraguariensis, antimicrobiano, resíduo, antioxidanteResumo
A atividade antibacteriana da erva-mate (EM) e de seus resíduos industriais carece de exploração mais aprofundada. O objetivo do trabalho foi avaliar a atividade antibacteriana contra bactérias patogênicas e o conteúdo polifenólico de folhas e galhos de YM extraídos por diferentes períodos. Staphylococcus aureus, S. epidermidis, Listeria monocytogenes e Escherichia coli foram testados contra extrato aquoso de folhas e galhos de EM e o modo de ação foi avaliado por microscopia. Os resultados mostraram que o extrato aquoso dos galhos inibiu ambas as espécies de Staphylococcus quando a extração ocorreu por 18h. O extrato das folhas apresentou inibição contra S. aureus. L. monocytogenes e E. coli não foram inibidas. A extração realizada por 10 minutos não produziu atividade antibacteriana. Não foi observada diferença significativa na concentração de polifenóis totais ou taninos condensados nos três extratos avaliados. A microscopia mostrou alterações na morfologia da célula bacteriana de S. aureus. EM e seu subproduto são uma fonte promissora de compostos funcionais.
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