Abstract
Antimicrobial effects of Melipona beecheii honey have been attributed to diverse factors, in this sense, certain components such as proteins and phenolics could explain relevant aspects of its antimicrobial activity. The aim of this study was to evaluate the antibacterial activity of phenolic and protein extracts from M. beecheii honey against two bacterial pathogens: Staphylococcus aureus and Escherichia coli. With respect to phenolic content, HPLC analysis allowed the identification of phenolic acids like chlorogenic acid, caffeic acid, and flavonoids like catechin, myricetin, quercetin and apigenin. On the other hand, seven bands with molecular weight from 7.6 to 95kDa were detected in protein extract by SDS-PAGE system. It was determined the antibacterial activity of both extracts, with MICs lower than 145µg/mL and 60µg/mL for the phenolic and protein extracts respectively. These results indicate that phenolic and protein components of M. beecheii honey contribute significantly to the antibacterial activity.
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