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Atividade antibacteriana de extrato hidro-alcoólico de folhas de jambolão (Syzygium cumini (L.) Skells)

A atividade antimicrobiana de plantas medicinais tem sido pesquisada em diversas espécies, tanto no Brasil quanto em outros países. O objetivo deste trabalho foi o de avaliar a existência de efeito antibacteriano de extrato hidro-alcoólico a 10% (m/v) de folhas de jambolão. Utilizaram-se 17 isolados...

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Published in:Ciência rural 2005-04, Vol.35 (2), p.371-376
Main Authors: Loguercio, Andrea Pinto, Battistin, Alice, Vargas, Agueda Castagna de, Henzel, Andréia, Witt, Niura Mazzini
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creator Loguercio, Andrea Pinto
Battistin, Alice
Vargas, Agueda Castagna de
Henzel, Andréia
Witt, Niura Mazzini
description A atividade antimicrobiana de plantas medicinais tem sido pesquisada em diversas espécies, tanto no Brasil quanto em outros países. O objetivo deste trabalho foi o de avaliar a existência de efeito antibacteriano de extrato hidro-alcoólico a 10% (m/v) de folhas de jambolão. Utilizaram-se 17 isolados bacterianos, Gram positivos e Gram negativos. A ação antibacteriana foi avaliada através da inoculação de placas de ágar Mueller Hinton, com um inóculo bacteriano de 1x10(6) ufc mL-1, onde se colocaram quatro discos de papel; o primeiro de antimicrobiano comercial e os demais embebidos em 25mL do extrato, de solução salina ou de etanol. As placas foram incubadas a 37°C por 24 horas, sendo posteriormente realizada a leitura do diâmetro dos halos de inibição. O extrato inibiu o crescimento de 100% das bactérias testadas e os isolados Gram positivos apresentaram um halo médio de 19,5mm, enquanto o dos Gram negativos foi de 18,8mm. Não houve inibição significativa de crescimento nos tratamentos com salina e etanol. Conforme os resultados deste estudo, o extrato testado apresenta atividade antibacteriana frente às amostras testadas, sem diferença de sensibilidade entre microrganismos Gram positivos e Gram negativos. The antimicrobial activity of medicinal plants has been searched in diverse species, as much in Brazil as in other countries. The aim of this study was to evaluate the existence of hydro-alcoholic extract jambolan leaves 10% (w/v) antibacterial effect. Seventeen Gram positive and Gram negative isolated bacterial were used. The antibacterial action was evaluated through the inoculation of Mueller Hinton agar plates, with a bacterial inoculate of 3x10(8) cell/ mL, with four paper discs, being the first of commercial antimicrobial and the others embedded with 25mL of the extract, saline or ethanol. The plates were incubated at 37°C for 24 hours, and their reading of inhibition hales diameter was done. The extract inhibited the growth of 100% of the tested bacteria; the Gram positive isolates had presented an average hale of 19.5mm, while of the Gram negative was of 18.8mm. There was not significant inhibition of growth in treatments with saline and ethanol. As verified in this study, the tested extract presents antibacterial activity against all the isolates, without sensitivity difference among Gram positive and Gram negative microorganisms.
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