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The Photochemical Isomerization Kinetics of Urocanic Acid and Their Effects upon the in vitro and in vivo Photoisomerization Action Spectra
Author(s) -
Hanson Kerry M.,
Simon John D.
Publication year - 1997
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.1751-1097.1997.tb03230.x
Subject(s) - photoisomerization , urocanic acid , isomerization , chemistry , photochemistry , in vivo , kinetics , irradiation , action spectrum , organic chemistry , biochemistry , amino acid , catalysis , biology , physics , microbiology and biotechnology , quantum mechanics , nuclear physics , histidine
— The kinetic rate equation for the photoreversible photoisomerization between trans ‐urocanic acid (UA) and cis‐UA following absorption of UV radiation has been solved and used to show that the maximum of the trans ‐UA photoisomerization action spectrum depends upon both the initial trans ‐UA concentration irradiated in an experiment and upon the irradiation dose used to determine the amount of cis ‐UA generated. This kinetic model can be used to explain current discrepancies between in vitro and in vivo photoisomerization action spectra reported in the literature.