Short Term: 2-8 degree. Long Term: -20 degree. Avoid multiple freeze-thaw cycles.
General Information
Background:
Vitamin B12, also known as cobalamin, is a kind of multi ring compound containing 3-valent cobalt. Four reduced pyrrole rings are linked together to form a large porphyrin ring (similar to porphyrin), which is the only vitamin containing metal elements. Vitamin B12 is a red crystalline powder, odorless and tasteless. It is slightly soluble in water and ethanol. It is most stable under the condition of pH 4.5~5.0 weak acid. It is decomposed in strong acid (pH<2) or alkaline solution, and may be damaged to some extent in case of heat.
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