| The activity of 23 samples of ethanolic brown propolis, from the State of Mato Grosso, was investigated against Escherichia coli ATCC 25922. The values of physical and chemical parameters showed significant variation among samples. The percentage of dry extract ranged from 2.6 to 27.6%. The index of oxidation varied from 3 to 519 seconds. All samples showed the percentage of wax higher than the limit preconized by the legislation, with values varying from 3.4 to 74.6%. The quantification of phenolic and flavonoid compounds, responsible for antimicrobial activity, ranged from 0.1 to 5.0 (w/w) and 0.02 to 0.66 (w/w), respectively, being that the higher the index of phenolic compounds the larger the zones of inhibition. Antibacterial activity was observed in... |
