Vitamin B 12, also known as cobalt amine, is the only vitamin containing metal elements. In nature, vitamin B12 is synthesized by microorganisms. Higher animals and plants cannot make vitamin B12. Vitamin B12 is the only vitamin that requires the help of an intestinal secretion (endogenous factor) to be absorbed. Some people due to gastrointestinal abnormalities, lack of this endogenous factor, even if adequate dietary sources can also suffer from malignant anemia. There is basically no vitamin B12 in vegetable foods. It stays in the gut for a long time and takes about three hours (most water-soluble vitamins take only a few seconds) to be absorbed. Vitamin B 12's main physiological function is to participate in the production of bone marrow red blood cells, prevent malignant anemia, prevent brain nerve damage. Vitamin B 12 is one of the last B vitamins to be found so far. Vitamin B12 is a polycyclic compound containing 3 valent cobalt. Four reduced pyrrole rings are linked together to form a Golin macroring (similar to porphyrin), which is the core of vitamin B12 molecule. Therefore, compounds containing this ring are referred to as Golin-like. Vitamin B12 is a light red acicular crystal which is easily soluble in water and ethanol. It is most stable under the condition of weak acid pH 4.5 and 5.0, and decomposes in strong acid (pH < 2) or alkaline solution, which can be destroyed to some extent in the event of heat. But short time high temperature disinfection loss is small, encounter bright light or ultraviolet ray is easy to be destroyed. The loss of ordinary cooking process is about 30%.

Nom du produit:	VITAMINE 12
CAS:	68-19-9
MF:	C63H88CoN14O14P
MW:	1355,37
EINECS:	200-680-0
La vitamine B12, qui est appelée VB12 pour faire court, également connue sous le nom de cobalamine, et est l'une des vitamines B, est une classe de composés organiques complexes contenant du cobalt de la classe Corrin et contenait du cobalt trivalent dans un plan de porphyrine Corrin similaire au centre de l'anneau Il s'agit de la molécule de vitamine la plus grande et la plus complexe découverte. C'est également la seule vitamine à ion métallique. Le cristal est rouge, on l'appelle aussi vitamine rouge.La plante ne contient pas de VB12, et ne peut pas produire de VB12. Le foie est la meilleure source de VB12, puis du lait, de la viande, des œufs, du poisson, etc. Le VB12 est une coenzyme essentielle dans la synthèse de l'ARN et de l'ADN. L'absence de VB12 in vivo peut provoquer des modifications pathologiques du système nerveux comme le nerf périphérique et le système nerveux central.