In vitro inhibitory effects of rosemary extracts on growth and glucosyltransferase activity of Streptococcus sobrinus

dc.contributor 國立臺灣師範大學人類發展與家庭學系 zh_tw
dc.contributor.author Po-Jung Tsai, Tzung-Hsun Tsai, Su-Chen Ho., en_US
dc.date.accessioned 2014-12-02T06:40:07Z
dc.date.available 2014-12-02T06:40:07Z
dc.date.issued 2007-01-01 zh_TW
dc.description.abstract Rosemary (Rosmarinus officinalis L.) extract functions as an antioxidant and antimicrobial agent. In this study, we investigated in vitro effects of rosemary extracts on Streptococcus sobrinus growth and on its extracellular glucosyltransferase activity. The antibacterial activities of rosemary extracts were determined by the microdilution broth method. The minimum inhibitory concentrations of aqueous and methanolic rosemary extracts against S. sobrinus were 16 and 4 mg/ml, respectively. Glucosyltransferase activity was tested by incubating a crude enzyme preparation with sucrose and determining the amount of water-insoluble glucan formed. Both aqueous and methanolic extracts of rosemary markedly inhibited the formation of water-insoluble glucan. The 50% inhibitory doses of aqueous and methanolic extracts against the glucosyltransferases of S. sobrinus were 1.42 mg/ml and 0.34 mg/ml, respectively. Our results suggest that rosemary extract may prove effective for the inhibition of the growth of cariogenic oral streptococci. en_US
dc.description.uri http://www.sciencedirect.com/science/article/pii/S0308814606009198 zh_TW
dc.identifier ntnulib_tp_A0308_01_005 zh_TW
dc.identifier.issn 0308-8146 zh_TW
dc.identifier.uri http://rportal.lib.ntnu.edu.tw/handle/20.500.12235/41506
dc.language en_US zh_TW
dc.publisher ELSEVIER en_US
dc.relation Food Chemistry, 105, 311-316. en_US
dc.relation.uri http://dx.doi.org/10.1016/j.foodchem.2006.11.051 zh_TW
dc.subject.other Glucan en_US
dc.subject.other Glucosyltransferase en_US
dc.subject.other Oral streptococci en_US
dc.subject.other Rosemary en_US
dc.title In vitro inhibitory effects of rosemary extracts on growth and glucosyltransferase activity of Streptococcus sobrinus en_US
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