RESUMENObjetivo: Determinar la actividad antibacteriana de extractos acuosos de uva (Vitis vinífera) obtenidos desde la cascara, semilla y pulpa, sobre Streptococcus mutans (ATCC 35668, Ecuador), empleando clorhexidina al 0.12% como control positivo y agua destilada como control negativo. Materiales y métodos: Se obtuvieron extractos acuosos a partir de la pulpa, semillas y cáscara de uva de la región norte del Ecuador, a una concentración de 40, 70 y 100%, que fueron impregnados 20 ml de cada uno en discos de papel filtro y colocados en cajas Petri con cepas de Streptococcus mutans inoculadas en agar sangre, discos impregnados en clorhexidina al 0,12% y agua destilada fueron empleados como control; la actividad antimicrobiana fue evaluada considerando los halos de inhibición obtenidos a las 24 y 48 horas de incubación. Resultados: los tiempos de evaluación 24 y 48 fueron diferentes (p= 0,00) mostrándose mayor efecto inhibitorio a las 48 horas, donde el extracto de semilla de uva al 100% presentó actividad antimicrobiana similar a la clorhexidina al 0,12%, y la concentración al 70% del mismo extracto menor inhibición. Sin embargo, los extractos de cáscara y pulpa en su diferente concentración no presentaron halos de inhibición frente a Streptococcus mutans. Conclusiones: El extracto acuoso de semillas de uva al 100%, mostro actividad antimicrobiana similar a la clorhexidina al 0,12% frente al Streptococcus mutans. ABSTRACT Objective:To determine the antibacterial activity of aqueous grape extracts (Vitis vinifera) obtained from the skin, seed and pulp, on Streptococcus mutans (ATCC 35668, Ecuador), using 0.12% chlorhexidine as a positive control and distilled water as a negative control. Materials and methods: Aqueous extracts were obtained from the pulp, seeds and grape skin of the northern region of Ecuador, at a concentration of 40, 70 and 100%, which were impregnated 20 ml each in paper filter discs. and placed in Petri dishes with strains of Streptococcus mutans inoculated on blood agar, disks impregnated in 0.12% chlorhexidine and distilled water were used as control; the antimicrobial activity was evaluated considering the inhibition zones obtained at 24 and 48 hours of incubation. Results: The evaluation times 24 and 48 were different (p = 0.00) showing a greater inhibitory effect at 48 hours, where the 100% grape seed extract presented antimicrobial activity similar to 0.12% chlorhexidine, and the 70% concentration of the same extract reduced inhibition. However, peel and pulp extracts in their different concentration did not present halos of inhibition against Streptococcus mutans. Conclusions: The aqueous extract of 100% grape seeds showed antimicrobial activity similar to 0.12% chlorhexidine against Streptococcus mutans.
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