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THE QUANTUM YIELD FOR BILIRUBIN PHOTOISOMERISATION
Author(s) -
Sloper R. W.,
Truscott T. G.
Publication year - 1982
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1982.tb02640.x
Subject(s) - quantum yield , flash photolysis , chemistry , relaxation (psychology) , excited state , molar absorptivity , photochemistry , yield (engineering) , bilirubin , laser , reaction rate constant , kinetics , materials science , optics , atomic physics , physics , fluorescence , psychology , social psychology , quantum mechanics , gastroenterology , metallurgy , medicine
— The difference extinction coefficient, dL 500 , for the photoisomerisation of bilirubin (BR) bound to human serum albumin is determined, by isolation of the product, as 4000 1000 mol ‐1 dm 3 cm ‐1 , This value is used with laser flash photolysis data to calculate the quantum yield for photoisomerisation as 0.2 +‐ 0.05 which allows the quantitative demonstration of the much higher efficiency of photoisomerisation compared with self sensitised photooxidation. Similar findings were made for BR in organic solvents and suggest that photoisomerising action is the major relaxation path for excited BR under a variety of conditions.