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This work investigates the ability of two  Croton  spp. essential oils (EO) to enhance chlorhexidine (CHX) activity against oral streptococci. EO’s chemical composition of  Croton argyrophyllus  and  C. pluriglandulosus  was determined by GC-MS/FID. The microbial growth kinetics and minimum inhibitory concentration (MIC) of EOs and CHX were determined, followed by their synergism against  S. mutans  UA159 and ATCC 25175,  S. salivarius  ATCC 7073 and  S.  sp. ATCC 15300. The microplate-based method was used to determine the EO/CHX activity against 24-h-old biofilms. The major compounds were α-pinene (54.74%) and bicyclogermacrene (16.08%) for EOAr and 1,8-cineole (17.41%), methyleugenol (16.06%) and elemicin (15.99%) for EOPg. Both EO had MIC around 16,000 µg/mL. EOs/CHX presented a synergistic effect against most strains (FIC i  from 0.133 to 0.375), and OE/CHX-treated biofilms showed a reduction in biomass and cell viability compared to CHX, only ( p  &lt; 0.01). Thus, the EOs works as natural adjuvants for CHX.

biofouling

Enhancement of chlorhexidine activity against planktonic and biofilm forms of oral streptococci by two  Croton  spp. essential oils from the Caatinga biome