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A Study of the Photochemistry of Dyes on Proteins and other Substrates
Author(s) -
CUMMING J. W.,
GILES C. H.,
McEachran A. E.
Publication year - 1956
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1956.tb02146.x
Subject(s) - chemistry , photodegradation , aqueous solution , gelatin , photochemistry , substrate (aquarium) , redox , side chain , histidine , absorption (acoustics) , oxidation reduction , organic chemistry , biochemistry , photocatalysis , polymer , materials science , enzyme , geology , catalysis , oceanography , composite material
The rates of oxidation and of reduction in aqueous solution, and of fading in films of a typical protein (gelatin) and a typical non‐protein (methylethylcellulose), have been determined for several series of dyes of different chemical classes. The general conclusion reached is that the photodegradation of a dye may follow either of the alternative mechanisms of oxidation or reduction, but normally oxidation occurs more readily on all non‐proteins and reduction on proteins. In photochemical oxidation of dyes on non‐proteins the substrate does not necessarily take part directly, but in reduction on proteins some constituent of the protein itself appears to act as the reducing agent. The histidine side‐chains are probably the active constituent. The conclusions in some instances have been confirmed by examination of spectral absorption curves of oxidation, reduction, and fading products of certain dyes.