Strict preparation and evaluation of water-soluble hat-stacked carbon nanofibers for biomedical application and their high biocompatibility: influence of nanofiber-surface functional groups on cytotoxicity

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Abstract
Water-soluble H-CNFs modified with a carboxyl group possessed the ability to induce TNF-α, whereas CHAPS-treated H-CNFs possessed significantly greater activity and were also found to activate NF-κB reporter activity, to a significantly greater level than H-CNFs; furthermore the functional group modified or coated on the surface of H-CNFs was a significant cytotoxic factor that affected cell activation.