Table 3.
Minimum bactericidal concentration values observed for each bacterium after exposure to PAH AuNPs and to free PAH. The value in parentheses after the MBC for PAH AuNPs indicates the amount of free PAH present in that concentration of PAH AuNPs as determined by the fluorescamine assay.35 (Ex: 0.281 ppm of PAH AuNPs contains a free PAH concentration of 2.12 ppm). The MBCs were determined in at least triplicate measurements.
| Bacteria | MBCPAH AuNPs (ppm) | Free PAH present at PAH AuNP MBC concentration (ppm) | MBCFree PAH (ppm) |
|---|---|---|---|
| A. vinelandii UW | ≤0.0281 | ≤0.212 | 2.12 |
| P. aeruginosa PAO1 | ≤0.0281 | ≤0.212 | >21.2 |
| S. oneidensis MR-4 | 0.281 | 2.12 | 2.12 |
| A. baylyi ADP1 | 2.09 | 15.8 | 14.8 |
| S. oneidensis MR-1 | ≥2.81 | ≥21.2 | ≥21.2 |