Cataluminescence strategy for rapid identification of sunscreen cosmetics based on its characteristic composition served as catalyst

In this work, a novel cataluminescence(CTL) strategy was developed for fast differentiation of sunscreen cosmetics. The CTL reactions occurring on the surface of sunscreen cosmetics whose characteristic composition served as catalyst. Normalization methodology was utilized to process sensor array signals, we developed a dimensionless quantity called “relative signal ( S kr )” to characterize the sensor response. Firstly, aldehydes are eligible for triggering CTL reactions on the surface of TiO 2 , so they served as probe in the CTL sensor. Then, with four aldehydes as sensor elements, the obtained four S kr of a catalytic material constitute as digital code for rapid screening of nanomaterials. Further, the CTL S kr of different brands and colors of sunscreen cosmetics were obtained. The CTL S kr functioned as digital code which can be used to distinguish sunscreen cosmetics. Intersecting, the CTL signals of the array could be applied to normalize, and identify sunscreen cosmetics of different brands and colors through linear discrimination analysis (LDA). It provides a rapid and convenience platform for distinguishing sunscreen cosmetics, and avoid cumbersome sample preparation. The strategy is a new idea for rapid distinguishing the complex samples based on its special ingredient.