Abstract
Abstract— 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.
Published Version
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