Resumo

ALARCON, María et al. In vitro evaluation of two extracts of Aloe vera in pathogenic bacteria. Salus [online]. 2016, vol.20, n.3, pp.41-46. ISSN 1316-7138.

The increase of bacterial resistance mechanisms has created special interest in the scientific community to search for active principles for the production of new antibiotics, and the Aloe Vera plant has been considered as a potential source to obtain them. The objective of this research was to evaluate the behavior of two types of Aloe Vera extracts, one fresh gel processed with DMSO and other obtained by the mesophyll by ethanol extraction process that was filtered, concentrated and lyophilized. Both extracts were evaluated with antimicrobial susceptibility testing by disc diffusion against Helicobacter pylori, Escherichia coli, Enterococcus faecalis, Staphylococcus aureus and Streptococcus mutans. The ethanolic extract of lyophilized mesophyll was tested in concentrations of 0.5 1.0 1.5 2.0 and 2.5 mg / ml, with each of the reference bacteria, showing no inhibition on bacterial growth in all concentrations tested. Gel-DMSO extract was tested with strains H. pylori, E. coli and S. aureus, obtaining inhibition halos of 14, 8.5 and 8.5 mm respectively. Scientific evidence of the antibacterial activity of this plant can be contradictory, and the processing of the extract is a determining factor in such variability. According to our results, we conclude that H. pylori was the bacteria most sensitive to Gel- DMSO extract compared with E. coli and S. aureus bacteria; also, we advise against the use of diluted and lyophilised extracts is in future research; rather, other alternative extraction process should be considered.

Palavras-chave : Aloe vera; antibacterial; ethanol extract; Gel-DMSO.

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