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The influence of extraction parameters on antimicrobial activity of propolis extracts

The extraction optimization of the poplar-type propolis was performed in order to improve the isolation of flavonoids and the corresponding antimicrobial activity of the products obtained. The efficiency of flavonoids extraction depended upon the type of extraction media used, following the rank 80% ethanol >40 ethanol>> water, regardless their pH value. Ultrasound assisted extraction was as efficient as the maceration procedure, offering additional benefits as short duration time and low extraction temperature. Antimicrobial efficiency of extracts prepared with 80 and 40% ethanol against tested microbial stains was comparable, regardless the extraction technique used, while aqueous extracts manly showed scarce activity. Observed antifungal activity against Candida albicans strongly correlated with flavones and flavonols content in extracts prepared (r2=0.8217), while regression analysis showed that beside flavonoids, some other components which were successfully extracted from the crude propolis contributed to observed antimicrobial efficiency against Bacillus subtilis and Staphylococcus aureus.

Poplar tyle propolis ; flavonoids ; maceration ; ultrasound extraction ; Bacillus subtilis ; Staphylococcus aureus ; Candida albicans

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