The in vitro study of ursolic acid and oleanolic acid inhibiting cariogenic microorganisms as well as biofilm
Version of Record online: 31 OCT 2012
© 2012 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd
Volume 19, Issue 5, pages 494–500, July 2013
How to Cite
Oral Diseases (2013) 19, 494–500
- Issue online: 28 MAY 2013
- Version of Record online: 31 OCT 2012
- Accepted manuscript online: 1 OCT 2012 12:10AM EST
- Manuscript Accepted: 21 SEP 2012
- Manuscript Revised: 20 SEP 2012
- Manuscript Received: 27 JUL 2012
- ursolic acid;
- oleanolic acid;
- Streptococcus mutans ;
- Actinomyces viscosus ;
The aim of this study was to examine the effect of ursolic acid (UA) and oleanolic acid (OA), triterpenoid compounds that are isolated from many edible and medicinal plants, on cariogenic microorganisms and biofilms.
A microtitre plate dilution assay was used to determine the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of UA and OA against two Actinomyces spp. and four Streptococcus spp. The antibacterial activity of UA and OA was assessed by crystal violet staining, scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM).
UA and OA displayed differential antibacterial activities against the six tested bacteria, with UA showing greater antibacterial activity than OA. Furthermore, the two drugs had greater antibacterial activity against Actinomyces spp. than Streptococcus spp. UA and OA at 1/4 MIC can reduce bacterial biofilm formation, whereas higher UA concentrations displayed antibacterial activity against Actinomyces viscosus and Streptococcus mutans in mature biofilms. For instance, 2.0 mg ml−1 UA was sufficient to kill an A. viscosus biofilm.
UA and OA inhibit the growth of cariogenic microorganisms, which suggests that UA and OA have considerable potential as antibacterial agents for dental caries prevention.