Figure 8From: Free radical scavenging and formation by multi-walled carbon nanotubes in cell free conditions and in human bronchial epithelial cellsCytotoxicity of a) MWCNT LNL1 and b) MWCNT LNL2 plotted against the intensity of the unique radical formed by MWCNT LNL1 and MWCNT LNL2 in medium + 0.6 mg/ml BSA in cell-free (80, 160, 320, 640 and 1000 μg/ml, representing 10, 20, 40, 80 and 125 μg/cm2) and cellular settings (80, 160, 320 and 640 μg/ml, representing 10, 20, 40 and 80 μg/cm2). The dose 10 μg/cm2 (80 μg/ml) was not tested in cell-free settings, and 1000 μg/ml (125 μg/cm2) was not tested in the cells. Columns represent the peak surface, i.e. area under curve (AUC), obtained by double integration of the unique peak (±SD). Lines represent cytotoxicity results (0-200 μg/cm2, representing 0-760 μg/ml). The average number of living cells is expressed as percentage of the number of living cells in control cultures. Symbols represent means. P < 0.001 (cell-free) and P < 0.0001 (cellular) for dose-dependent formation of the unique radical by both MWCNTLNL1 and MWCNTLNL2.Back to article page