Sunscreen interactions (DOI: 10.2436/20.2003.01.32)
Keywords:
Laser Flash Photolysis, UV-filters, Avobenzone, Singlet oxygen, Triplet excited state, Photostability.Abstract
Sunscreens are used to protect against ultraviolet (UV) radiation reaching earth i.e. UVA and UVB regions of the solar spectrum. Among the different characteristics a sunscreen should possess, photostability is important not only to maintain an efficient protection along exposition time but also to avoid adverse effects like phototoxicity and photoallergy. However, many filters are photoreactive. This is the case of the well-known tert-butylmethoxydibenzoylmethane (BM-DBM, also known as
avobenzone) which, in spite of its photolability, is a widely used
UVA filter. In sunscreen formulation, at least two filters are generally present in order to cover all the UV spectra. This could
produce a synergistic effect that favours filter stabilization or, on
the other hand, could accelerate filter decomposition. Thus, improvement of UV filter stability is a key factor in sunscreen
development that relies on the understanding of photochemical
and photophysical properties of the filter combination. However,
until now a general methodology to study systematically these
combinations does not exist.
In this work, we have focused the attention on the interactions
between avobenzone and six commercial UV filters. In order to
investigate the photostability of sunscreens in a more systematic
way, the designed strategy takes into account all the different
processes that could occur between the different single components.
Keywords: Laser Flash Photolysis, UV-filters, Avobenzone,
Singlet oxygen, Triplet excited state, Photostability.
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