Resumo

PENA SANCHEZ, Marisol et al. Capacidad fotoprotectora de la zeolita: estudio preliminar. Rev Cubana Invest Bioméd [online]. 2001, vol.20, n.1, pp.12-15. ISSN 0864-0300.

Despite its benefits, the sun may become a terrible enemy of the skin by inducing photoaging and in some cases photocarcinogenesis. This makes it necessary to permanently use sunscreens produced on the basis of active principles that provide protection through various mechanisms. This paper was intended to evaluate the protective capacity of zeolite to UV radiations and determine the sun protection factor of formulations by spectrometry with Mansur´s equation. Zeolite was added to an oil cream in water at different concentrations (2, 4 and 6%) which were spectrometrically examined using titanium dioxide (TiO₂) formulations (2, 4 and 6%) ans comparison patterns and ESCALOL ISP VAN DIK as commercial standard. Also the photoprotective capacity was determined by the photoprotection technique with bacteria (E. coli), taking the commercial standard as a positive control. The spectrophotometric analysis showed that just like TiO₂ formulations, zeolite absorbs UVB; furthermore a high reflectance effect, a phenomenum found in TiO2 was observed in zeolite formulations ( 4 & 6%). The results of photoprotection techinque using bacteria indicated that in both zeolite and ESCALOL-protected cultures there was a higher number of surviving bacterial populations than in unprotected cultures

Palavras-chave : SKIN AGING; ULTRAVIOLET RAYS [adverse effects]; SPECTROPHOTOMETRY [methods]; SUNSCREENING AGENTS; SUNLINGHT [adverse effects]; PHOTOSENSITIVITY DISORDERS.

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