Abstract
A new derivative of pyridoxine was formed in the incubation mixture containing uridine 5'-diphosphoglucuronyltransferase from rabbit liver, uridine 5'-diphosphoglucuronic acid and pyridoxine. This derivative was isolated and assumed to be pyridoxine β-glucuronic acid-like substance from data, viz., mobilities on paper chromatography and paper electrophoresis, ultraviolet absorption spectra at acidic, neutral and alkaline pH, and products by hydrolysis with β-glucuronidase from Helix pomatia.