Analysis Note Purity based on UV and HPLC. Caution This material is 80-90% pure when prepared, but is very unstable. As much as 10% purity loss per day at 25 °C has been noted. Biochem/physiol Actions Methyl donor; cofactor for enzyme-catalyzed methylations, including catechol O-methyltransferase (COMT) and DNA methyltransferases (DNMT). Although present in all cells, it is concentrated in liver where 85% of all methylation reactions occur. It is also involved in regulating liver function, growth, and response to injury. |