Avaliação da atividade dos extratos hidroetanólico de Chenopodium ambrosioides L. e de Eucalyptus alba Reinw ex Blume, frente a cepas de Mycobacterium sp

Abstract

Chenopodium ambrosioides and Eucalyptus alba are species used in folk medicine for the treatment of tuberculosis and sputum. This study aimed to determine the physical-chemical, microbiological parameters, define phytochemical screening and evaluate antimycobacterial, cytotoxicity, immunomodulation, and toxicity in vivo activities of extracts and fractions. In physical-chemical and microbiological evaluation of C.ambrosioides and E. alba extracts, were found parameters in accordance with the specific literature for medicinal plants. The phytochemical screening of the extracts revealed the presence of saponins, steroids, triterpenoids, phenols and tannins, C. ambrosioides extract also showed proteins and amino acids, while the E. alba extract was positive for organic acids and lactones. The results of broth microdilution assay and microplate alamar blue assay showed moderates activities against the Mycobacterium fortuitum of E. alba extract and ethyl acetate fraction (FAcE) of E. alba; the chloroform fraction (FCl) of C.ambrosioides and the ethyl acetate fraction (FacEA) of E. alba were moderately active against the Mycobacterium tuberculosis. The cytotoxic activity, evaluated by MTT method, showed that the extracts did not reduce cell viability in the concentrations tested. In the immunomodulation assay, E. alba extract presented potential anti-inflammatory effect, by the methods of inhibition the production of NO and TNFα. No signs of acute oral toxicity of the extracts at a dose of 2500 mg/kg in mice were detected. These results suggest the potential antimycobacterial the FAcE of E. alba and immunomodulatory of E. alba extract and can serve as a resource for future studies, aimed at isolation of active compound and elucidation of their mechanisms of action.