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Title: In vitro inhibitory effects of rosemary extracts on growth and glucosyltransferase activity of Streptococcus sobrinus
Authors: 國立臺灣師範大學人類發展與家庭學系
Po-Jung Tsai, Tzung-Hsun Tsai, Su-Chen Ho.,
Issue Date: 1-Jan-2007
Publisher: ELSEVIER
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.
ISSN: 0308-8146
Other Identifiers: ntnulib_tp_A0308_01_005
Appears in Collections:教師著作

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