Table 2.

Effect of cranberry NDM on preformed S. gordonii biofilm.

NDM concentration (μg/mL)	Metabolic activity	Biofilm mass
0 (control)	2.21 ± 0.3	2.36 ± 0.41
2.5	2.14 ± 0.18	2.33 ± 0.33
5.0	2.24 ± 0.22	2.39 ± 0.27
7.5	2.06 ± 0.4	2.35 ± 0.44
10	1.96 ± 0.33	2.41 ± 0.31
20	1.84 ± 0.59	2.34 ± 0.41
25	1.97 ± 1.1	2.36 ± 0.29
50	1.86 ± 0.69	2.39 ± 0.3
100	1.08 ± 0.44	2.35 ± 0.28

Bacterial biofilm prepared as described previously was treated with varying concentrations of NDM (2.5 μg/mL to 100 μg/mL) for 60 minutes and 4 hours. The metabolic activity was determined by XTT assay and the biofilm mass determined by the crystal violet staining.