A kinetic study of the photochemical and thermal conversion of photoisomers, especialy peaks 0 and 3 [(EE)-bilirubin IX alpha and (EZ)- and (ZE)-bilirubin IX alpha], under anaerobic conditions, was performed by using reversed-phase high-pressure liquid chromatography. Peaks 0 and 3 are spontaneously, photochemically and thermally converted. Short-term photoirradiation of bilirubin gives a mixture containing not only the geometric isomers (EE)-, (EZ)- and (ZE)-bilirubin IX alpha, but also peak 2, (EZ)-cyclobilirubin IX alpha. On prolonged irradiation, cyclization and 15Z leads to 15E isomerization lead to gradual accumulation of two pairs of photoproducts: (EZ)-cyclobilirubin IX alpha A and B and (EE)-cyclobilirubin IX alpha A and B.
Kinetic study of photochemical and thermal conversion of bilirubin IX α and its photoproducts
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K Isobe, S Itoh, S Onishi, T Yamakawa, T Ogino, T Yokoyama; Kinetic study of photochemical and thermal conversion of bilirubin IX α and its photoproducts. Biochem J 1 March 1983; 209 (3): 695–700. doi: https://doi.org/10.1042/bj2090695
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