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Antibacterial activity of proanthocyanidins (PACN). A different activity was noticed for various concentrations (expressed as mg/mL). For P. gingivalis (A) only concentrations >0.03 mg/mL were effective in significantly reducing viability (p < 0.01, indicated by the *) with results of approximately 10%. By contrast, PACN had moderate effect on (B) S. salivarius in comparison to P. gingivalis. Values are represented as the mean ± SD of 16 independent measurements.
