Macromolecular crowding affects protein photosensitivity: The case of egg white immunoreactivity

► UV-C light decreases the immunoreactivity of egg white protein solutions. ► UV-C light promotes fragmentation of egg white protein. ► Above 2.2 g/l concentration, egg white protein is resistant to UV-light. ► Macromolecular crowding makes egg white protein resistant to photolysis.