Conformity of dextran-coated fullerene C70 with L929 fibroblast cells.

Fullerene C70 with symmetric nanostructure and unique properties that open up leeway for both material science and healthcare applications. Poor water dispersity and limited knowledge about its associated toxicity hinders the biomedical scope of C70. These restraining factors need to be addressed. Dextran, natural and water-soluble polymer was used to improve the dispersity of C70 in water. Dextran coating on C70 successfully yielded stable dispersion of C70 in water with remarkable cytocompatibility with L929 fibroblast cells. The dextran-coated C70 was characterized using different characterization techniques such as fourier transformed-infrared spectroscopy (FT-IR), transition electron microscopy (TEM), dynamic light scattering (DLS) and zeta potential. The cell viability assays suggested that the L929 cells retained more than 80% cell viability after 24 h treatment with dextran-coated C70. The mitochontrial membrane potential of the treated cells were found to be uncompromised. Fluorescent imaging techniques done with the aim of evaluating the integrity of lysosomes detected no potential toxicity in L929 cells treated with dextran-coated C70. Actin filaments showed intact organelles when viewed using Rhodamine- phalloidin staining after 24 h post-treatment. DAPI staining also revealed the integrity of nucleus after exposure to dextran-coated C70. The calcein AM/PI flow cytometry analysis further confirmed that dextran-coated C70 kept cell viability of treated cells above 80% for all concentrations. The results points out the scope of dextran-coated C70 for various health care applications.