[article]
| Titre : |
Photochemical behavior assessment of sunscreen preparations by in vitro UV spectroscopy |
| Type de document : |
texte imprimé |
| Auteurs : |
Louis Ferrero, Auteur ; Marc Pissavini, Auteur ; Stephanie Marguerie, Auteur ; Leonhard Zastrow, Auteur |
| Année de publication : |
2004 |
| Article en page(s) : |
p. 197-205 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Tags : |
'Comportement photochimique in vitre' 'Test de produit antisolaire' 'Photoprotection UVA et UVB ' 'Spectroscopie UV' |
| Index. décimale : |
668.5 Parfums et cosmétiques |
| Résumé : |
In this study, we used a spectroscopic method, found effective in measuring sunscreen photo-degradation results in terms of a photoabsorption decrease. The traditional approach was to measure variations in well-known parameters such as the absolute in vitro sun protection factor (SPF) or the relative UVA/UVB ratio after a controlled dose of UV radiation. However, these parameters fail to fully reflect the product's photochemical behavior. Variation in the SPF mainly depicts changes in UVB filtration, and variation in the relative parameter UVA/UVB ratio can be subjected to misinterpretation, as is the case for products in which a parallel loss of photoabsorption is observed in the UVA and UVB regions. In our laboratory, we developed a new approach using pure spectroscopic UVA and UVB attenuation factors called UVA attenuation factor and UVB attenuation factor. Attenuation factors are defined here as the inverse of the arithmetic mean of the transmittance data, taken either from the UVB region (290–320 nm, 1 nm steps) or the UVA region (320–400 nm, 1 nm steps). Using these two new spectroscopic indices, the photochemical behavior of a sunscreen formula can be assessed in each UV region. The general procedure consists of applying two UV doses to a film of sunscreen previously spread on a roughened polymethylmethacrylate plate and then measuring the UV transmission versus wavelength before and after the irradiation process. We tested different UV filters in a cosmetic base to demonstrate the efficacy of the method. |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10475 |
in IFSCC MAGAZINE > Vol. 7, N° 3 (07-08-09/2004) . - p. 197-205
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Photochemical behavior assessment of sunscreen preparations by in vitro UV spectroscopy in IFSCC MAGAZINE, Vol. 7, N° 3 (07-08-09/2004)
