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• W1991604231 abstract "In order to better understand the mechanisms of action, of sunlight on skin, a study of the free radicals formed by irradiation of its protein constituents, has been undertaken. Samples of stratum corneum keratin and of skin collagen have been u.v. irradiated, in a vacuum, at – 196°C, then transferred to an electron spin resonance spectrometer (E.S.R.). The E.S.R. signals have then been recorded at – 160°C and at increasing temperatures in order to follow the transformations of primary free radicals into secondary species more stable at room temperature. For keratin, u.v. rays produce radicals of the type -NH-CHR at low temperature but it is not possible to identify them more precisely. These free species react with combined glycine of neighbouring protein chains to form -NH-CH-CO-(I) radicals, the E.S.R. spectrum of which can be observed from –60°C onwards. In the presence of air, rather unstable peroxide radicals are formed. For irradiated collagen, the E.S.R. signals recorded at increasing temperatures show in addition to (I) some evidence of alanine free radicals (-NH-CH-CH3 at – 160°C and -NH-C(CH3)-CO- from -20°C onwards). These results allow a better understanding of the mechanisms which lead to premature ageing of the skin through sunlight exposure and to the transformation of collagen into even more cross-linked proteins. In addition, this study of the free radicals formed in stratum corneum keratin, allows a more refined discussion of the protective effect of skin melanin pigments. Etude par R.P.E. des radicaux libres formés par action de la lumière ultra-violette sur les protéines de la peau Afin de mieux comprendre les mécanismes de l'action du soleil sur la peau, on a entrepris une étude des radicaux libres formés par irradiation de ses constituants protéiniques. Des échantillons de kératine de stratum corneum et de collagène de peau on été soumis à une irradiation u.v., sous vide, à– 196°C, puis transférés dans un spectrographe de résonance paramagnétique électronique (R.P.E.). Les signaux de R.P.E. ont alors éte enregistrés à– 160°C at à des températures croissantes, afin de suivre les transformations des radicaux libres primaires en radicaux secondaires plus stables à température ordinaire. Pour la kératine, les rayons u.v. produisent à basse température des radicaux du type -NH-CHR sans qu'on puisse toutefois en préciser la nature exacte. Ces derniers réagissent avec la glycine combinée dans les chaînes protéiniques voisines pour former des radicaux." @default.
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• W1991604231 date "1979-08-01" @default.
• W1991604231 modified "2023-09-26" @default.
• W1991604231 title "E.S.R. study of free radicals formed in skin proteins by u.v. irradiation" @default.
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• W1991604231 doi "https://doi.org/10.1111/j.1467-2494.1979.tb00215.x" @default.
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