The objectives of this study are the development of new caged luciferins and the quantitative determination of the photophysical parameters of their photo-decomposition. We synthesized 7-(diethylaminocoumarin)-4-(yl)methyl caged D-luciferin (DEACM-caged D-luciferin) and quantitatively characterized its absorption spectrum, bioluminescence, and photoproducts using chiral HPLC chromatography, as a function of light-irradiation time. We observed that 4 min of UV irradiation generated maximum D-luciferin concentrations, which corresponds to 16.2% of the original DEACM-caged-D-luciferin concentration. Moreover, we evaluated not only the rate of photocleavage (0.20/min) from DEACM-caged D-luciferin to luciferin but also the rate of caged-luciferin degradation that did not produce luciferin (0....
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