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Stoeckelhuber, Markus; Pluym, Nikola; Bracher, Franz; Leibold, Edgar; Scherer, Gerhard and Scherer, Max (2019): A validated UPLC-MS/MS method for the determination of urinary metabolites of Uvinul (R) A plus. In: Analytical and Bioanalytical Chemistry, Vol. 411, No. 30: pp. 8143-8152

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Uvinul (R) A plus (DHHB) is a synthetic benzophenone derivative mainly used in sunscreens, and also in other skin care products. The compound is authorized by the EU as UV filter and a maximum concentration of 10% in consumer products is permitted. Despite its high production volume and usage in consumer products,to date, no information about the systemic exposure to Uvinul (R) A plus in humans is available. Therefore, we developed a human biomonitoring method which allows the simultaneous determination of three major metabolites of Uvinul (R) A plus in human urine samples. Furthermore, three minor metabolites of Uvinul (R) A plus were identified by ion trap experiments. Urine samples were enzymatically hydrolyzed, extracted via liquid-liquid extraction with ethyl acetate, and analyzed by means of UPLC-MS/MS. The final method was validated according to FDA guidelines and applied to 58 urine samples retrieved from the general German population. The three major and specific metabolites of Uvinul (R) A plus were found in about 36% of the samples, proving the suitability of the method for future human biomonitoring studies.

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