Resolution of ultrafast excited state kinetics of bilirubin in chloroform and bound to human serum albumin
Literature Information
Burkhard Zietz, Tomas Gillbro
The Z–E-isomerisation of bilirubin upon excitation with visible light is a fundamental step in phototherapy of newborns with neonatal jaundice. Here we report results of an ultrafast optical spectroscopy study of bilirubin in CHCl3 as well as bound to human serum albumin. The data show that the initially excited singlet state has sub-ps decay times with major amplitude. Transient absorption measurements reveal that the ultrafast decay of the emission is accompanied by the formation of a transient intermediate which decays on the 15–20 ps timescale. The initial photoprocesses are thus considerably faster than the previously reported fastest lifetimes for bilirubin and this is, to our knowledge, the first time that the earliest processes in excited bilirubin have been resolved.
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.














