Aims:The purpose of this study was to compare the effect of hop extracts with diverse βacid concentrations on Streptococcus mutans biofilm formation.
Methods and Results:Ten different hop extracts, with αacid concentrations similar to those found in commercial beer products and βacid concentrations ranging from 2.6 to 8.1%, were added to distilled water to make standardized concentrations.S. mutans isolates were treated with hop extract dilutions varying from 1:2 to 1:256.The minimum inhibitory, minimum bactericidal and minimum biofilm inhibitory concentrations were determined and the optical density was evaluated. Live/dead staining confirmed the bactericidal effects. Biofilm formation of several strains of S. mutans was significantly inhibited by hop extract dilutions of 1:2, 1:4, 1:8, 1:16 and 1:32. Strong negative correlations were observed between αand βacid concentrations of the hop extracts and S. mutans total growth and biofilm formation.
Conclusions:The use of hop extracts prepared similarly to commercial beer decreased S. mutans biofilm formation.
Significance and Impact of the Study:The inclusion of hops in the commercial beer products may provide beneficial health effects. Further studies are warranted to determine an effect in vivo on the development of dental caries.
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