Abstract
The development of carbon nanotubes (CNTs) for biomedical and biotechnological applications has gained great promise re- cently, especially for their interesting use in the delivery of therapeutically active molecules to targeted cells. The interaction between cells and this nanomaterial is a critical feature that is responsible for the pharmacological effect as well as for any eventual toxicity. With respect to the latter aspect, in this manuscript we have evaluated a few parameters that seem to be involved in the cytotoxic profile of CNTs (both Single-walled (SWCNTs) and Multi-walled (MWCNTs) nanotubes), such as their sidewall functionalization, tubes' length, solubility, concentration and purity. Among them, we identified the last as the most crucial factor: we have shown that our ultrapure, to- tally dispersible, carbon nanotubes not only display lack of toxicity in the range of concentrations normally used (10-150 μg/ml), but they also pave the way for an extensive use of this material for several biomedical purposes.
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