ELECTRON SPIN RESONANCE OF MELANIN FROM HAIR. EFFECTS OF TEMPERATURE, pH AND LIGHT IRRADIATION |
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| Authors: | R. Arnaud G. Perbet A. Deflandre G. Lang |
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| Affiliation: | *Laboratoire de Photochimie Moléculaire et Macromoléculaire (Equipe associée au C.N.R.S. No. 929) Universitéde Clermont II, B.P. 45–63170 Aubiere, France;†Centre de Recherches de la Sociéte L'Oreal Département de Chimie Générale, 1, avenue de Saint Germain, 93601 Aulnay Sous Bois, France |
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| Abstract: | ![]()
Abstract— The variation with temperature, pH and light of the ESR signal of hydrated melanin powders from Japanese black hair has been studied. An explanation of the results is proposed on the basis of quinhydrone type complexes and of acid-base equilibria of melanin and its semiquinone radicals. During exposure to light of wavelengths 254–600 nm, both stable and unstable radicals have been observed. The action spectrum for the formation of stable melanin radicals has been determined. |
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