Antimicrobial and antioxidant activities of alcoholic extracts obtained from vegetative organs of A. retroflexus.

Antimicrobial and antioxidant activities of alcoholic extracts obtained from vegetative organs of A. retroflexus. Roum Arch Microbiol Immunol. 2014 Jan-Jun;73(1-2):35-42 Authors: Marinaş IC, Chifiriuc C, Oprea E, Lazăr V Abstract In vitro antimicrobial and antioxidant activities of Amaranthus retroflexus leaves and inflorescence alcoholic (ethanol 70%) extracts of various concentrations ranging from 0.78 to 400 μL/ml were analyzed on different clinical and reference bacterial strains (Staphylococcus aureus, Bacillus subtills, Enterococcus faecalis, Klebsiella pneumoniae, Escherichia coli, Pseudomonas aeruginosa, Acinetobacter baumannii) and fungal strains (Candida albicans, C. famata, C. utilis, Saccharomyces cerevisiae) using agar disk diffusion method and broth dilution method (MIC determination) for antimicrobial activity and TEAC (Trolox capacity) assay for the evaluation of the antioxidant activity. The adapted diffusion method was used to test the antimicrobial effect of the extracts separately and in combination with a range of standard antibiotics, in order to evidence any synergic effects of A. retroflexus extracts on the antibiotics activity. The extracts showed the highest inhibitory effect against K. pneumoniae and B. subtilis with no activity against S. aureus among the bacterial strains, while in case of the fungal strains the most intensive effect was exhibited against C. famata by both extracts. The A. retroflexus ...
Source: Roumanian Archives of Microbiology and Immunology - Category: Microbiology Tags: Roum Arch Microbiol Immunol Source Type: research