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Antimicrobial effects of herbal extracts on Streptococcus mutans and normal oral streptococci

  • Microbial Physiology and Biochemistry
  • Published:
Journal of Microbiology Aims and scope

Abstract

Streptococcus mutans is associated with dental caries. A cariogenic biofilm, in particular, has been studied extensively for its role in the formation of dental caries. Herbal extracts such as Cudrania tricuspidata, Sophora flavescens, Ginkgo biloba, and Betula Schmidtii have been used as a folk remedy for treating diseases. The purpose of this study was to evaluate and compare the antibacterial activity of herbal extracts against normal oral streptococci, planktonic and biofilm of S. mutans. Streptococcus gordonii, Streptococcus oralis, Streptococcus salivarius, Streptococcus sanguinis, and S. mutans were cultivated with brain heart infusion broth and susceptibility assay for the herbal extracts was performed according to the protocol of Clinical and Laboratory Standard Institute. Also, S. mutans biofilm was formed on a polystyrene 12-well plate and 8-well chamber glass slip using BHI broth containing 2% sucrose and 1% mannose after conditioning the plate and the glass slip with unstimulated saliva. The biofilm was treated with the herbal extracts in various concentrations and inoculated on Mitis-Salivarius bacitracin agar plate for enumeration of viable S. mutans by counting colony forming units. Planktonic S. mutans showed susceptibility to all of the extracts and S. mutans biofilm exhibited the highest level of sensitivity for the extracts of S. flavescens. The normal oral streptococci exhibited a weak susceptibility in comparison to S. mutans. S. oralis, however, was resistant to all of the extracts. In conclusion, the extract of S. flavescens may be a potential candidate for prevention and management of dental caries.

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  1. Department of Oral Microbiology and Immunology, College of Dentistry, Dankook University, Cheonan, 330-714, Republic of Korea

    Sung-Hoon Lee

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  1. Sung-Hoon Lee
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Correspondence to Sung-Hoon Lee.

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Lee, SH. Antimicrobial effects of herbal extracts on Streptococcus mutans and normal oral streptococci. J Microbiol. 51, 484–489 (2013). https://doi.org/10.1007/s12275-013-3312-5

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  • DOI: https://doi.org/10.1007/s12275-013-3312-5

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