Química Nova (Jan 2009)

UVA I-protection effectiveness of bioactive compound and organic UV filters: an in vitro assessment

  • André Rolim Baby,
  • Tatiana Santana Balogh,
  • Carla Aparecida Pedriali,
  • Telma Mary Kaneko,
  • Maria Valéria Robles Velasco

DOI
https://doi.org/10.1590/S0100-40422009000500039
Journal volume & issue
Vol. 32, no. 5
pp. 1321 – 1323

Abstract

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This research work aimed at determining the UVA effectiveness (UVA I/UV ratio), by diffuse transmittance analysis, of sunscreens developed with a bioactive substance, the rutin, associating or not with organic UVB-UVA filters incorporated at a phosphate-base O/W emulsion. Sunscreens provided conflicting and unpredictable results concerning the anti-UVA protection, specially, at the UVA I region. Possible interactions among the organic UV filters and the polyphenolic bioactive substance may have accounted with improvement or reduction of UV protection by a complex and not yet elucidated mechanism, probably regarding wavelength delocalization to superior or inferior values, by resonant molecule stabilization or destabilization.

Keywords