R-996 titanium dioxide, white powder, insoluble in water, non-physiological toxicity, chemically stable, with excellent weather resistance and anti-powdering ability.

The conjugation of vitamin C to the P25TiO₂NPs was confirmed by UV-visible spectroscopy of lyophilized vitaminC@P25TiO₂NPs suspensions. The typical absorbance peak of ascorbic acid at 265 nm was found. However, no further characterization was done because they did not show the expected protective effect against the photo-induced cell damage (Fig. 3).

Due to its light-scattering properties, small amounts of titanium dioxide are added to certain foods to enhance their white color or opacity (1Trusted Source, 3Trusted Source).