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The vitaminC@P25TiO2NPs, on the other side, did not have any effect on cell protection against ROS. This might be due to the fact that vitamin C, a well-known scavenger of ROS, could behave as prooxidant and even promote ROS and lipid peroxidation [39]. It was recently described that at small concentrations of vitamin C, the prooxidant effects dominate; while in large concentrations the antioxidant ones predominate [40]. The effect also depends on the cell state and the interaction of vitamin C with light. In this case, ascorbic acid may act as an antenna to harvest visible light when conjugated to P25TiO2NPs. Indeed, it was previously found that this combination (in some ratios) could have an improved photocatalytic activity, possibly due to a red shift in its light absorbance [41]. Further studies on vitaminC@P25TiO2NPs were not conducted, because of the poor antioxidant capacity [42].

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China is one of the largest producers and consumers of titanium dioxide powder in the world. There are numerous titanium dioxide powder factories in China, mainly located in Sichuan, Shandong, Guangdong, and other regions. These factories adopt advanced technology and equipment to produce high-quality titanium dioxide powder. They not only supply domestic market but also export to Europe, America, Asia, and other regions. In addition to China, there are also many titanium dioxide powder factories in other countries such as the United States, Japan, and Germany In addition to China, there are also many titanium dioxide powder factories in other countries such as the United States, Japan, and Germany In addition to China, there are also many titanium dioxide powder factories in other countries such as the United States, Japan, and Germany In addition to China, there are also many titanium dioxide powder factories in other countries such as the United States, Japan, and Germanytitanium dioxide powder factories. These factories compete with each other in terms of product quality, price, and service to meet the needs of different customers.

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