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. 2019 Aug 23;14(8):e0221756. doi: 10.1371/journal.pone.0221756

Fig 1. Antibacterial activity of licorice extract against S. mutans in vitro.

Fig 1

A) Effect of licorice extract on growth of S. mutans. Licorice or equal volume of phosphate buffered saline (PBS, negative control) was added to the cultures at Time 0. Optical density was measured at 600nm at indicated time points. B) Killing activity of licorice extract against S. mutans. Cultures were exposed to licorice or phosphate buffered saline (PBS, negative control) for indicated amount of time. CFUs were counted by serial dilution and plating. For both A and B, values represent average of 2 biological replicates (with 2 technical replicates for each biological replicates). Error bars = SD. Where no error bars are visible, length of error bar is shorter than symbol.