Innovations upon antioxidant capacity evaluation for cosmetics: A photoelectrochemical sensor exploitation based on N-doped graphene/TiO2 nanocomposite
Abstract The anti-aging of human skin is always an essential factor concerned by people who love beauty. In order to maintain skin at a healthy and fair situation, proper cosmetics will achieve the expected anticipation, in which the antioxidant component should undertake the pivotal composition to resist free radicals. Antioxidant capacity detection should provide direct evidence for cosmetics identification and evaluation. In this paper, a photoelectrochemistry (PEC) platform based on N-doped graphene/TiO 2 (NGT) nanocomposite has been established, which was for the first time proposed as sensor for antioxidants capacity assay. The annealing technique has been employed for in-situ preparation of NGT and successful nitrogen atoms doping was verified by XPS as well as elemental mapping technique. This PEC platform was successfully acted as sensing activation into antioxidant capacity evaluation toward different commercial cosmetics prototypes. Subsequently, the related mechanism was further unearthed and in-depth discussed. This investigation should have meaningful instructions on makeup screening as well as profound impact on guidance of healthy daily life for human beings. Highlights N-doped graphene/TiO 2 photoelectrochemical (PEC) sensor has been established. Light irradiation from back side of the sensor facilitated assay of colored samples. This high-efficient PEC sensor has been applied to global antioxidant capacity evaluation for cosmetics. Synergistic effect of antioxidant components in make-up sample was achieved. Relevant mechanism was further unearthed and in-depth discussed. Graphical abstract We reported the development of a photoelectrochemical (PEC) platform based on N-doped graphene/TiO 2 (NGT) nanocomposite. Such a PEC sensor was further successfully applied to rationally evaluate antioxidant capacity of cosmetics by employing ascoric acid (AA) as equivalent. [DISPLAY OMISSION]
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