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In order to contribute with experimental evidence that could help to achieve a better understanding of the field for future regulation, in the present work, the biocompatibility of commercial P25TiO2NPs (one type of TiO2NPs used in sunscreen formulations) and two novel functionalized P25TiO2NPs were evaluated under solar simulated irradiation. White light, generated by red, blue, and yellow LEDs, together with UV ones, was chosen to simulate the solar spectra. Functionalization of TiO2NPs was made with antioxidant vitamins in order to prevent the expected photo-initiated ROS production when nanoparticles are exposed to the simulated solar spectra. Vitamin B2 (riboflavin) and vitamin C were chosen to carry out the functionalization because they are water-soluble, low-cost, and are a constitutive part of biological processes. In addition, it is known that both have the potential to prevent macromolecular oxidation by ROS [23][24][25][26].

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One of the key advantages of using titanium oxide as a pigment is its high refractive index, which gives it excellent opacity and brightness. This makes it an ideal choice for use in paints and coatings, where it can add color, durability, and protection to various surfaces. In addition, titanium oxide is also highly stable and resistant to UV radiation, making it a popular choice for use in sunscreens, cosmetics, and other products that require protection from the sun.

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