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The purpose of the present study was to determine the antimicrobial activity of eight plant
extracts on oral pathogens, such as Streptococcus mutans, Streptococcus sanguinis,
Streptococcus sanguis and Candida albicans. The antimicrobial activities were determined
using the agar disk diffusion method.
Of the plant extracts tested, the MeOH extract of Alnus sp. and the ethylacetate fraction of
Schizandra chinensis exhibited antimicrobial activity against all four oral pathogens.
Most of the extracts of Alnus sp. and Schizandra chinensis showed relatively high antibacterial
activity against S. mutans and S. sanguinis with the diameter of inhibition zones ranging
between 11 to 35 mm, 12 to 28 mm, respectively.
Especially, the MeOH extract and EA fraction of Schizandra chinensisBall were found to
exhibit a distinctive antimicrobial activity. Thus, the compounds containing in these fractions may be beneficial for the prevention of periodontal disease. However, the extracts of Poncirus trifoliata, Betula platyphylla var. japonica, Betula schmidtii and dry grapes did not inhibit antimicrobial activity.