Pyridoxal 5-phosphate (monohydrate) (Standard) is the analytical standard of Pyridoxal 5-phosphate (monohydrate). This product is intended for research and analytical applications. Pyridoxal 5-phosphate monohydrate, the active form of vitamin B6, is an essential cofactor for multiple enzymes, including aromatic l-amino acid decarboxylase that catalyzes the final stage in the production of the neurotransmitters dopamine and serotonin. Pyridoxal 5-phosphate monohydrate is the most important coenzyme variant in the process of vitamin B6 intracellular phosphorylation and is interconvertible with other variants, including pyridoxine 5'-phosphate (PNP) and pyridoxamine 5'-phosphate (PMP)[1][2].