Photostability of Trolox in Water/Ethanol, Water, and Oramix CG 110 in the Absence and in the Presence of TiO2
- 31 December 2004
- journal article
- Published by Taylor & Francis in Journal of Dispersion Science and Technology
- Vol. 25 (2) , 193-207
- https://doi.org/10.1081/dis-120030666
Abstract
Trolox (synthetic, hydrosoluble phenolic derivative of vitamin E, used as an active in cosmetic products) can undergo photooxidation upon UVB and UVA irradiation, the main degradation intermediate being Trolox C quinone. Trolox photodegradation rate decreases with decreasing polarity of the solvent, most likely because a more apolar environment inhibits oxidative processes. Ethanol is thus able to protect Trolox from degradation. Micellar solutions of Oramix CG 110® can incorporate Trolox in their core and protect it from photodegradation, either by providing an apolar environment or by competing for light absorption. Trolox can be degraded in the presence of titanium dioxide (an additive in many cosmetic products) under photocatalytic conditions, and both ethanol and Oramix show a certain protection effect towards Trolox photocatalytic degradation. However, concerning both direct photolysis and photocatalytic degradation, the protection given by ethanol and Oramix to Trolox results in at most 50...Keywords
This publication has 18 references indexed in Scilit:
- Effect of Some Additives Used in the Cosmetic Field on the Photocatalytic Activity of RutileJournal of Dispersion Science and Technology, 2002
- A novel sunscreen system based on tocopherol acetate incorporated into solid lipid nanoparticlesInternational Journal of Cosmetic Science, 2001
- Photocatalytic Activity of Inorganic SunscreensJournal of Dispersion Science and Technology, 2001
- The photodegradation of vitamins A and E in parenteral nutrition mixtures during infusionClinical Nutrition, 2000
- Photolysis of α-Tocopherol in Olive Oils and Model SystemsJournal of Agricultural and Food Chemistry, 1998
- A kinetic study of the one-electron oxidation of Trolox C by the hydroperoxidase activity of lipoxygenaseBiochimica et Biophysica Acta (BBA) - General Subjects, 1997
- Photocatalytic degradation of mixed surfactants and some commercial soap/detergent products using suspended TiO2 catalystsJournal of Molecular Catalysis A: Chemical, 1996
- Solvent influence on the kinetics of the photodynamic degradation of trolox, a water-soluble model compound for vitamin EJournal of Photochemistry and Photobiology B: Biology, 1995
- Partitioning and antioxidant action of the water-soluble antioxidant, Trolox, between the aqueous and lipid phases of phosphatidylcholine membranes: 14C tracer and product studiesBiochimica et Biophysica Acta (BBA) - Biomembranes, 1995
- Clinical adsorption and photodegradation of the fatsoluble vitamins A and EClinical Nutrition, 1991