Wavelength-Dependent Photochemistry and Biological Relevance of a Bilirubin Dipyrrinone Subunit

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Publikace nespadá pod Filozofickou fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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MADEA Dominik MAHVIDI Sadegh CHALUPA David MUJAWAR Taufiqueahmed Pirsaheb DVOŘÁK Aleš MUCHOVA Lucie JANOŠ Jiří SLAVÍČEK Petr ŠVENDA Jakub VÍTEK Libor KLÁN Petr

Rok publikování 2020
Druh Článek v odborném periodiku
Časopis / Zdroj Journal of Organic Chemistry
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://doi.org/10.1021/acs.joc.0c01673
Doi http://dx.doi.org/10.1021/acs.joc.0c01673
Klíčová slova Quantum yield; Isomerization; Molecular structure; Quantum mechanics; Irradiation
Popis Phototherapy is a standard treatment for severe neonatal jaundice to remove toxic bilirubin from the blood. Here, the wavelength-dependent photochemistry of vinylneoxanthobilirubic acid methyl ester, a simplified model of a bilirubin dipyrrinone subunit responsible for a lumirubin-like structural rearrangement, was thoroughly investigated by liquid chromatography and mass and absorption spectroscopies, with the application of a multivariate curve resolution analysis method supplemented with quantum chemical calculations. Irradiation of the model chromophore leads to reversible Z -> E photoisomerization followed by reversible photocyclization to a seven-membered ring system (formed as a mixture of diastereomers). Both the isomerization processes are efficient (Phi(ZE) similar to Phi(EZ) similar to 0.16) when irradiated in the wavelength range of 360-410 nm, whereas the E-isomer cyclization (Phi(c) = 0.006-0.008) and cycloreversion (Phi(-c)= 0.002-0.004) reactions are significantly less efficient. The quantum yields of all processes were found to depend strongly on the wavelength of irradiation, especially when lower energy photons were used. Upon irradiation in the tail of the absorption bands (490 nm), both the isomers exhibit more efficient photoisomerization (Phi(ZE) similar to Phi(EZ )similar to 0.30) and cyclization (Phi(c) = similar to 0.07). In addition, the isomeric bilirubin dipyrrinone subunits were found to possess important antioxidant activities while being substantially less toxic than bilirubin.
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