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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-binding domains are mainly found in two families of enzymes present in animals and prokaryotes, which perform distinct kinds of reactions at the cobalt-carbon bond .
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 ]
Cyanocobalamin is the most common form used in dietary supplements and food fortification because cyanide stabilizes the molecule against degradation. Methylcobalamin is also offered as a dietary supplement. [12] There is no advantage to the use of adenosylcobalamin or methylcobalamin forms for the treatment of vitamin B 12 deficiency. [20] [21 ...
️ Seek out methylcobalamin. Most vitamin B12 supplements contain cyanocobalamin, which contain trace amounts of cyanide, Somer says. It’s also far less efficient than supplements made with ...
Cyanocobalamin is commercially prepared by bacterial fermentation. Fermentation by a variety of microorganisms yields a mixture of methylcobalamin , hydroxocobalamin and adenosylcobalamin . These compounds are converted to cyanocobalamin by addition of potassium cyanide in the presence of sodium nitrite and heat.
Commonly cyanocobalamin or methylcobalamin in vitamin supplements. A coenzyme involved in the metabolism of all animal cells, especially affecting DNA synthesis and regulation, but also fatty acid metabolism and amino acid metabolism.
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