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Methylcobalamin (mecobalamin, MeCbl, or MeB 12) is a cobalamin, a form of vitamin B 12. It differs from cyanocobalamin in that the cyano group at the cobalt is replaced with a methyl group . [ 1 ] Methylcobalamin features an octahedral cobalt(III) centre and can be obtained as bright red crystals. [ 2 ]
methylcobalamin, the adenosyl ligand in vitamin B 12 is replaced by methyl. Cyanocobalamin is a manufactured form of B 12 . Bacterial fermentation creates AdoB 12 and MeB 12 , which are converted to cyanocobalamin by the addition of potassium cyanide in the presence of sodium nitrite and heat.
Vitamin B 12 deficiency; Other names: Hypocobalaminemia, cobalamin deficiency: Image of the cervical spinal cord in vitamin B 12 deficiency showing subacute combined degeneration. . (A) The midsagittal T2 weighted image shows linear hyperintensity in the posterior portion of the cervical tract of the spinal cord (black arrow
In molecular biology, the vitamin B12-binding domain is a protein domain which binds to cobalamin (vitamin B12). It can bind two different forms of the cobalamin cofactor, with cobalt bonded either to a methyl group (methylcobalamin) or to 5'-deoxyadenosine (adenosylcobalamin).
Cobalamin (vitamin B 12) is the largest and most structurally complex vitamin.It consists of a modified tetrapyrrole, a corrin, with a centrally chelated cobalt ion and is usually found in one of two biologically active forms: methylcobalamin and adenosylcobalamin.
Cerefolin is a prescription medication made by Pamlab that contains 5.635 mg of folate as L-methylfolate, 1 mg of vitamin B 12 as methylcobalamin, 50 mg of vitamin B 2 as riboflavin, and 5 mg of vitamin B 6 as pyridoxine.
Hydroxocobalamin, also known as vitamin B 12a and hydroxycobalamin, is a vitamin found in food and used as a dietary supplement. [1] As a supplement it is used to treat vitamin B12 deficiency including pernicious anemia.
Cyanocobalamin is a form of vitamin B 12 used to treat and prevent vitamin B 12 deficiency except in the presence of cyanide toxicity. [7] [8] [2] The deficiency may occur in pernicious anemia, following surgical removal of the stomach, with fish tapeworm, or due to bowel cancer.
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