AskDefine | Define cyanocobalamin

Dictionary Definition

cyanocobalamin n : a B vitamin that is used to treat pernicious anemia [syn: vitamin B12, cobalamin, antipernicious anemia factor]

User Contributed Dictionary



  1. cobalmin.

Extensive Definition

Cyanocobalamin is an especially common "vitamer" (that is, member of a family of vitamins, all of which have some particular nutritional activity in preventing some vitamin deficiency disease) of the B-12 vitamin family. It is the most famous vitamer of the family, because it is chemically the most air-stable, and it is the easiest to crystallize and therefore easiest to purify after it is produced by bacterial fermentation. The cyanide is added to the molecule by activated charcoal columns in purification. Thus, the use of this form of B-12 is the most wide-spread.
This fact has caused some people (usually from reading labels on packages and vitamin supplements, in which vitamin B-12 is almost always listed last, since ingredients by law are listed in order of weight %), to infer that the "correct" chemical name of vitamin B-12 actually is cyanocobalamin. In fact, "vitamin B-12" is the name for a whole class of chemicals with B-12 activity, and "cyanocobalamin" is only one of these. Cyanocobalamin usually does not even occur in nature, and cyanocobalamin is not one of the forms of this vitamin which is directly used in the human body (or that of any other animal). However, animals and humans can convert it to active (cofactor) forms of the vitamin, such as methylcobalamin.


cyanocobalamin in Arabic: فيتامين بي12
cyanocobalamin in Catalan: Cianocobalamina
cyanocobalamin in Czech: Vitamín B12
cyanocobalamin in German: Cobalamine
cyanocobalamin in Spanish: Cianocobalamina
cyanocobalamin in Esperanto: Kobalamino
cyanocobalamin in French: Vitamine B12
cyanocobalamin in Korean: 바이타민 B12
cyanocobalamin in Croatian: Vitamin B12
cyanocobalamin in Italian: Cobalamina
cyanocobalamin in Hebrew: ויטמין B12
cyanocobalamin in Luxembourgish: Cobalamin
cyanocobalamin in Lithuanian: Kobalaminas
cyanocobalamin in Malay (macrolanguage): Vitamin B12
cyanocobalamin in Dutch: Cobalamine
cyanocobalamin in Japanese: シアノコバラミン
cyanocobalamin in Norwegian: Kobalamin
cyanocobalamin in Occitan (post 1500): Vitamina B12
cyanocobalamin in Polish: Witamina B12
cyanocobalamin in Portuguese: Vitamina B12
cyanocobalamin in Russian: Витамин B12
cyanocobalamin in Slovak: Kobalamín
cyanocobalamin in Serbian: Витамин Б12
cyanocobalamin in Serbo-Croatian: Vitamin B12
cyanocobalamin in Finnish: B12-vitamiini
cyanocobalamin in Swedish: Kobalamin
cyanocobalamin in Thai: วิตามินบี12
cyanocobalamin in Vietnamese: Vitamin B12
cyanocobalamin in Turkish: Siyanokobalamin
cyanocobalamin in Chinese: 钴胺素
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