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Phenylbenzotriazole Sulfonic AcidCompounds of phenylbenzotriazole sulfonicacid origin are just recently introduced for cosK.Skotarczak, A. Osmola-Man´kowska, M. Lodyga, A. Polan´ska, M. Mazur, Z. Adamskimetic purposes. Their action covers a wide spectrumranging from UVB to visible light, while simultaneouslybeing a very good absorbent ofUVA radiation. Registered substances of thisgroup include the following:• Drometrizole trisiloxane (Mexoryl® XL)• Bisoctrizole (Tinosorb® M)• Bemotrizinol (Tinosorb® S)Drometrizole trisiloxane is a compound that iswell persisting on the skin suface, due to thesiloxane portion of the molecule. Concentrationsmay not exceed 15% in cosmpetic products.Bisoctrizole, or Tinosorb® M, is a pigment thatis water-soluble. Its fine particles remain on theskin surface, but physicochemical properties donot allow for penetration of the compoundthrough the skin. In cosmetics, presence may notexceed a concentration more than 10%.Tinosorb® S is a compound very similar toTinosorb® M, but is fat-soluble. The maximumauthorized concentration in cosmetic products isalso 10%.
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