vitamin b12 is also called the cobalt amine or cyanide cobalt element. it is a kind of composed of porphyrin compounds containing cobalt b vitamins. initially found taking the liver can control the symptoms of pernicious anemia, after 20 years of research, was isolated from the liver until 1948 a control effect of pernicious anemia with red crystal material, named as vitamin b12. in 1963, determine its structural formula. to complete the synthetic in 1973. vitamin b12 is found so far in b vitamins at the latest one. vitamin b12 is a kind of cobalt containing 3 price polycyclic compounds, 4 reduction of pyrrole ring together into a goo lin large ring (similar to porphyrin), is the core of vitamin b12 molecules. so are the class of compounds containing this kind of ring goo moiety. vitamin b12 for shallow red needle crystal, soluble in water and ethanol, at ph 4.5 ~ 5.0 under the condition of weak acid is the most stable, strong acid (ph < 2) or break down in the alkaline solution
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