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Photostabilization of organic UV‐absorbing and anti‐oxidant cosmetic components in formulations containing micronized manganese‐doped titanium oxide
Author(s) -
Wakefield G.,
Stott J.
Publication year - 2007
Publication title -
international journal of cosmetic science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 62
eISSN - 1468-2494
pISSN - 0142-5463
DOI - 10.1111/j.1467-2494.2007.00369_1.x
Subject(s) - chemistry , emulsion , manganese , titanium oxide , nuclear chemistry , titanium , titanium dioxide , inorganic chemistry , organic chemistry , materials science , metallurgy
Micronized titanium oxide (TiO2) and manganese‐doped titanium oxide (TiO2:Mn) particles have been incorporated into a variety of oil‐in‐water (O/W) and water‐in‐oil‐in‐water (W/O/W) emulsions in conjunction with the UV‐absorbing organic compounds butyl methoxydibenzoylmethane (BMDM) and octyl methoxycinnamate (OMC) and with the anti‐oxidants vitamin E and vitamin C. The retention of the organics under solar exposure has been shown to be significantly enhanced by the addition of TiO2:Mn to the formulation. In the case of BMDM and OMC, the retention is increased from 20% and 24% to 63% and 83%, respectively, after 2 h of solar exposure. In this system, TiO2 particles are shown to provide only limited protection relative to BMDM and OMC. Vitamin E and vitamin C are actively degraded by the presence of TiO2 in the emulsion during solar exposure. This effect is reversed with TiO2:Mn, the use of which can protect >90% of anti‐oxidants in both the oil and water phases of the formulation. The absence of reactive oxygen species (ROS) generation and surface scavenging of ROS by TiO2:Mn is responsible for a significantly reduced ROS load on the organic components and consequent photostabilization of the emulsion.