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The cell cytotoxicity of various sizes of cobalt nanoparticles, which includes cobalt phosphate octahydrate (CHP) and cobalt phosphates calcinated at 200 °C, 400 °C, and 600 °C (CP2, CP4, and CP6) against HeLa cells at concentrations of 10, 20, 50, and 100 µg/mL after 24 h at 30 °C. 1% Triton-X 100 served as a positive control, while untreated HeLa cells were used as negative control. Lactate dehydrogenase (LDH) assay kit (Invitrogen) was used as per the manufacturer’s instructions.
