Abstract
Histidine photooxygenation has been the subject of extensive investigation for many years. The intricate nature of histidine distinguishes it from other amino acids, as its side chain readily undergoes changes in charge state and tautomerization in response to pH, and the polarity of the imidazole ring inverts upon oxidation. This complexity gives rise to a diverse range of oxidation products and mechanisms, posing challenges in their interpretation. This review aims to provide a thorough overview of the chemistry involved in histidine photooxygenation, encompassing a comprehensive analysis of resulting products, mechanisms engaged in their formation, and analytical techniques that have contributed to their identification. Additionally, it explores a wide range of applications stemming from this transformation, offering valuable insights into its practical implications in fields such as materials science, biomedical research, and drug development. By bridging the existing gap in literature, this review serves as a resource for understanding the intricacies of histidine photooxygenation and its diverse ramifications.
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