Actividad antibacteriana in vitro del extracto etanólico de hojas de Chamaesyce thymifolia frente a cepas bacterianas por los métodos de difusión en agar y macrodilución, Iquitos, 2017
Abstract
En el presente trabajo de investigación se evaluó y determinó la actividad antibacteriana in vitro del extracto etanólico de Chamaesyce thymifolia utilizando los métodos de Difusión en agar y Macrodilución. Las cepas bacterianas utilizadas fueron: Klebsiella pneumoniae, Proteus vulgaris, Salmonella sp., Bacillus cereus, Bacillus subtilis, Staphylococcus aureus, Escherichia coli y Pseudomonas aeruginosa. Como control positivo se utilizó gentamicina, meropenem, vancomicina y ciprofloxacino; como control negativo, solución de etanol/agua 1:1. Por el método de difusión en agar, los resultados demostraron que el extracto etanólico de Chamaesyce thymifolia presenta actividad antibacteriana a la concentración de 25 mg/ml un rango de lectura Sensible frente a Klebsiella pneumoniae, Proteus vulgaris, Salmonella sp, Bacillus subtilis, Staphylococcus aureus, Escherichia coli y Pseudomonas aeruginosa. Por el método de Macrodilución, la Concentración Mínima Inhibitoria (CMI) a 16 mg/ml del extracto etanólico de hojas de Chamaesyce thymifolia, es Inactivo frente a Salmonella sp., Klebsiella pneumoniae, Proteus vulgaris, Escherichia coli y Pseudomonas aeruginosa. A 8 mg/ml, es Poco Activo frente a las mismas bacterias. A 4mg/ml, el efecto del extracto etanólico es Moderadamente Activo frente a Bacillus cereus, Bacillus subtilis y Staphylococcus aureus. In the present research work, the in vitro antibacterial activity of the ethanolic extract of Chamaesyce thymifolia was evaluated using agar diffusion and macrodilution methods. The bacterial strains used were: Klebsiella pneumoniae, Proteus vulgaris, Salmonella sp., Bacillus cereus, Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. As a positive control, the antibiotics gentamicin, meropenem, vancomycin and ciprofloxacin were used; as a negative control, an ethanol / water solution at a 1: 1 concentration. By the agar diffusion method, in the concentration of 25mg/ml the results showed that the ethanolic extract of Chamaesyce thymifolia shows antibacterial activity reflected in the inhibition diameters, obtaining a reading range Sensitive against Klebsiella pneumoniae, Proteus vulgaris, Salmonella sp, Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Pseudomonas aerugionosa. By the Macrodilution method according to reading range, the Minimum Inhibitory Concentration (MIC) at 16 mg / ml of the ethanolic extract of Chamaesyce thymifolia leaves proved to be inactive against Salmonella sp., Klebsiella pneumoniae, Proteus vulgaris, Escherichia coli and Pseudomonas aureginosa. At the concentration of 8 mg / ml, it proved to be not very active against the same bacteria. At the concentration of 4mg / ml, it was demonstrated that the effect of the ethanolic extract of Chamaesyce thymifolia leaves is Moderately Active against Bacillus cereus, Bacillus subtilis and Staphylococcus aureus.
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