UROCANIC ACID PHOTOBIOLOGY. PHOTOCHEMICAL BINDING OF UROCANIC ACID TO BOVINE SERUM ALBUMIN*

Abstract
Abstract— The photolysis of E‐[ring‐2‐14C]urocanic acid with bovine serum albumin (BSA) leads to incorporation of radiolabel into the protein. Levels up to 68 nmol mg−1 BSA have been observed if the irradiation is carried out in an inert atmosphere. Oxygen reduces the level slightly. It appears from gel‐filtration chromatography that the label incorporation is covalent in nature.