Interactions among flavonoids of propolis affect antibacterial activity against the honeybee pathogen Paenibacillus larvae
- PMID: 22386493
- DOI: 10.1016/j.jip.2012.02.009
Interactions among flavonoids of propolis affect antibacterial activity against the honeybee pathogen Paenibacillus larvae
Abstract
Propolis is derived from plant resins, collected by honeybees (Apis mellifera) and renown for its antibacterial properties. Here we test the antibacterial effects of ethanolic extracts of propolis from different origins on Paenibacillus larvae, the bacterial pathogen that causes American Foulbrood, a larval disease that can kill the honeybee colony. All tested propolis samples inhibited significantly the growth of P. larvae tested in vitro. The extracts showed major differences in the content of total flavonoids (ranging from 2.4% to 16.4%) and the total polyphenols (ranging between 23.3% and 63.2%). We found that it is not only the content of compounds in propolis, which influences the strength of antimicrobial effects but there is also a significant interaction effect among flavonoids of the propolis extracts. We propose that interaction effects among the various chemical compounds in propolis should be taken into account when considering the antibacterial effects against honeybee pathogens.
Copyright © 2012 Elsevier Inc. All rights reserved.
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