Abstract: Samples of six sunscreening cosmetic product of same brand and series but collected from separate distribution channels were analyzed with Fourier transform attenuated total reflection infrared spectrometry (ATR-FTIR).At the same time the variety and content of sunscreening agent in the cosmetic products were detected by high performance liquid chromatography (HPLC).Results showed that,in the FTIR spectra,there are quite big differences among the structure of main functional group of the sunscreening agent in the cosmetic product of same brand and series but collected from separate distribution channels.Further,the differences are quite conspicuously correlated with the variety and content of the sunscreening agent in the cosmetics detected by HPLC.

Key words: sunscreening cosmetics, Fourier transform attenuated total reflection infrared spectrometry, identification