Figure 2.

Cytotoxic effect of empty LCNs on human keratinocytes (NCTC2544) cells as a function of increasing lipid concentration after 72 h of incubation. LCNs cytotoxic effect is expressed both as percentage of cell viability (filled symbols and solid line, •) by MTT test and percentage of cell death (hollow symbols and dashed line, ◦) by trypan blue dye exclusion assay. For each experiment, untreated cells (■, □) were considered as control. Results represents the average of six different experiments ± standard deviation. If error bars are not visible, they are within the symbols.