Flavin mononucleotide disodium salt; FMN; 7,8-Dimethyl-10-ribitylisoalloxazine Phosphate Sodium; 5'-(Dihydrogen Phosphate)riboflavin Sodium; Riboflavine 5-Phosphate Sodium; Riboflavin Mononucleotide Sodium; Riboflavine Monophosphate Sodium; Riboflavine Phosphate Sodium; Vitamin B2 Phosphate Sodium

Flavin mononucleotide (FMN), or riboflavin-5′-phosphate, is a biomolecule produced from riboflavin (vitamin B2) by the enzyme riboflavin kinase and functions as prosthetic group of various oxidoreductases including NADH dehydrogenase as well as cofactor in biological blue-light photo receptors. During the catalytic cycle, a reversible interconversion of the oxidized (FMN), semiquinone (FMNH•) and reduced (FMNH2) forms occurs in the various oxidoreductases. FMN is a stronger oxidizing agent than NAD and is particularly useful because it can take part in both one- and two-electron transfers. In its role as blue-light photo receptor, (oxidized) FMN stands out from the 'conventional' photo receptors as the signaling state and not an E/Z isomerization. It is the principal form in which riboflavin is found in cells and tissues. It requires more energy to produce, but is more soluble than riboflavin.