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%.

Isem tal-Prodott:	VITAMINA 12
CAS:	68-19-9
MF:	C63H88CoN14O14P
MW:	1355.37
EINECS:	200-680-0
Il-Vitamina B12, li fil-qosor tissejjaħ VB12, magħrufa wkoll bħala cobalamin, u hija waħda mill-vitamini B, hija klassi ta ’komposti organiċi kumplessi li fihom il-klassi Corrin tal-kobalt, u li fihom kobalt trivalenti fi pjan Corrin simili tal-porfirin fiċ-ċentru taċ-ċirku .Hija l-ikbar u l-aktar kumplessa molekula ta 'vitamina li ġiet skoperta. Hija wkoll l-unika vitamina bil-jone tal-metall. Il-kristall huwa aħmar, jissejjaħ ukoll vitamina ħamra. L-impjant ma fihx VB12, u ma jistax jipproduċi VB12. Il-fwied huwa l-aħjar sors ta 'VB12, imbagħad mill-ħalib, laħam, bajd, ħut eċċ. VB12 huwa koenzima essenzjali fis-sintesi ta' RNA u DNA. In-nuqqas ta 'VB12 in vivo jista' jikkawża bidliet patoloġiċi fis-sistema nervuża bħan-nerv periferali u s-sistema nervuża ċentrali.