Antibacterial activity of mulberry extracts and purified fractions against oral pathogenic bacteria.

This study aimed to isolate antibacterial compounds active against periodontopathic bacteria from mulberry (Morus alba) leaves. The acetone-soluble fraction of mulberry leaves was extracted from the oil layer by oil/water separation. The extract was purified using silica gel open-column chromatography. The minimum inhibitory concentration (MIC) of the crude extract or purified fractions against Porphyromonas gingivalis was measured at each step. The MIC of the crude extract against P. gingivalis was 62.5–125 μg/mL. The fractions showing activity against P. gingivalis were designated Cf K and Cf P. The MICs of Cf K against P. gingivalis , Fusobacterium nucleatum , Prevotella intermedia, and Streptococcus mutans were 6.25 μg/mL, 25 μg/mL, 12.5 μg/mL, and 12.5 μg/mL, respectively. In contrast, the MICs of Cf P against P. gingivalis , F. nucleatum , P. intermedia, and S. mutans were 25.0 μg/mL, >50 μg/mL, 50 μg/mL, and 12.5–25.0 μg/mL, respectively. Mulberry leaves contain antibacterial components against periodontopathic bacteria such as P. gingivalis , F. nucleatum , and P. intermedia. [ABSTRACT FROM AUTHOR]