HPLC DETERMINATION OF THE SUN-SCREEN AGENT UVINUL T-150 IN COSMETIC PRODUCTS USING DIODE-ARRAY DETECTION

A method is described for the quantitative determination of the sun-screen agent Uvinul T-150 in cosmetic products. It is based on a simple extraction into acidic THF and a HPLC determination with gradient elution and diode array detection, using a column packed with 5-mu-m Lichrosorb RP-18. The detection limit is 10 ng and linearity is observed up to 5-mu-g injected. Other sun-screen agents, commonly used in the finished products, have been analyzed and their chromatographic parameters are reported. The method has been applied for determiningUvinul T-150 and all the compounds considered in some cosmetic samples of different polarity.