3.3. Glucosyltransferase and glucan-binding lectin inhibition
In order to study the mechanism of action, the effect of the extracts at the such concentrations (the lowest con- centrations that could inhibit the adherence of S. mutans at least 50%) on GTF and GBL activities were examined. All extracts could decrease the activity of GTF signifi- cantly. Chinese black tea was the strongest inhibitor for S. mutans ATCC 25175, followed by Harrisonia perfo- rata, Cassia alata and Andrographis paniculata, respec- tively, while Andrographis paniculata and Cassia alata exhibited similar inhibition on GTF activity of S. mutans TPF-1 (Fig. 4). Statistical analysis of various herbal ex- tracts effect on GTF activity inhibition showed significant difference between Andrographis paniculata and Chi- nese black tea, Andrographis paniculata and Harrisonia perforata, Chinese black tea and Cassia alata, Chinese black tea and Harrisonia perforata in S. mutans ATCC
25175.
For the GBL assay, Andrographis paniculata could de- crease the activity of GBL of both strains, resulting in re- duced bacterial aggregation. Cassia alata could decrease the activity in S. mutans ATCC 25175 but eliminate the activity in S. mutans TPF-1. Chinese black tea and Harrisonia per- forata showed neither decrease nor elimination in S. mutans ATCC 25175 (Fig. 5 and Table 1).
3.3. Glucosyltransferase and glucan-binding lectin inhibitionIn order to study the mechanism of action, the effect of the extracts at the such concentrations (the lowest con- centrations that could inhibit the adherence of S. mutans at least 50%) on GTF and GBL activities were examined. All extracts could decrease the activity of GTF signifi- cantly. Chinese black tea was the strongest inhibitor for S. mutans ATCC 25175, followed by Harrisonia perfo- rata, Cassia alata and Andrographis paniculata, respec- tively, while Andrographis paniculata and Cassia alata exhibited similar inhibition on GTF activity of S. mutans TPF-1 (Fig. 4). Statistical analysis of various herbal ex- tracts effect on GTF activity inhibition showed significant difference between Andrographis paniculata and Chi- nese black tea, Andrographis paniculata and Harrisonia perforata, Chinese black tea and Cassia alata, Chinese black tea and Harrisonia perforata in S. mutans ATCC25175.For the GBL assay, Andrographis paniculata could de- crease the activity of GBL of both strains, resulting in re- duced bacterial aggregation. Cassia alata could decrease the activity in S. mutans ATCC 25175 but eliminate the activity in S. mutans TPF-1. Chinese black tea and Harrisonia per- forata showed neither decrease nor elimination in S. mutans ATCC 25175 (Fig. 5 and Table 1).
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