Antibacterial Activity of Green Tea Extracts against Streptococcus anginosus group

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  • KITADA Katsuhiro
    Department of Preventive Dentistry, Kagoshima University Graduate School of Medical and Dental Sciences
  • INOUE Masakazu
    Department of Preventive Dentistry, Kagoshima University Graduate School of Medical and Dental Sciences
  • OHO Takahiko
    Department of Preventive Dentistry, Kagoshima University Graduate School of Medical and Dental Sciences

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  • 緑茶抽出物のStreptococcus anginosus groupに対する抗菌作用
  • リョクチャ チュウシュツブツ ノ Streptococcus anginosus group ニ タイスル コウキン サヨウ

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Abstract

Streptococcus anginosus group comprises a part of the normal flora in the human mouth and is closely associated with pyogenic infectious diseases in various body sites. It has been demonstrated that various kinds of antibacterial and medicinal ingredients are contained in green tea leaves, and tea extracts have antimicrobial effects against cariogenic and periodontopathic bacteria. Here, we report the antibacterial effects of green tea extracts against S. anginosus group. Against the 18 strains of oral bacteria including S. anginosus group (S. anginosus, 7 strains; S. constellatus, 3 strains; S. intermedius, 4 strains), the antibacterial effects of green tea extracts were tested. Three strains of S. intermedius and one of S. constellatus were sensitive to tea extracts. However, no strains of S. anginosus showed sensitivity to the extracts. Next, we examined whether the effects of the extracts were bactericidal or bacteriostatic using two species of bacteria which showed strong sensitivity. Against the 2 strains of S. constellatus NCTC10708 and S. intermedius K201K, the extracts showed a growth inhibitiory effeet, and the effect was bactericidal.

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