PHOTOCHEMICAL DEGRADATION OF KERATINS
| Autor: | F. G. Lennox, R. J. Rowlands |
|---|---|
| Rok vydání: | 1969 |
| Předmět: |
Mammals
chemistry.chemical_classification Light integumentary system Ultraviolet Rays Tryptophan General Medicine Biochemistry Radiation Effects Amino acid analysis chemistry Wool Feather visual_art Polymer chemistry Keratin visual_art.visual_art_medium Animals Keratins Photochemical degradation sense organs Irradiation Physical and Theoretical Chemistry Photodegradation Nuclear chemistry |
| Zdroj: | Photochemistry and Photobiology. 9:359-367 |
| ISSN: | 1751-1097 0031-8655 |
| DOI: | 10.1111/j.1751-1097.1969.tb07300.x |
| Popis: | — Twenty-nine samples of fur, hair. wool and feathers have been irradiated with a Sunlamp (Λ max. 310 nm) and with a 2 kW mercury vapour lamp emitting mixed U.V. and visible radiation resembling sunlight. Photodegradation is accompanied by progressive yellowing when irradiated with the Sunlamp. It is accompanied by bleaching followed by yellowing, or by bleaching throughout irradiation if the initial yellowness is high, when exposed to the 2 kW lamp. A group of nine fur and hair samples, representing four different orders of mammals, are the most sensitive to yellowing, followed by a group of ten wool and hair samples from the Artiodactyla and finally by the feather keratins which are less susceptible than the α-keratins. Amino acid analysis of the keratins before and after Sunlamp irradiation shows strong correlation of yellowing both with the initial concentration of tryptophan and with its destruction during irradiation. Similar correlations of yellowing with destruction of other amino acids are less significant. Preliminary washing with non-ionic detergent increases susceptibility to u.v. yellowing. |
| Databáze: | OpenAIRE |
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