USD $1.00-10.00 / Kilogram
we have gmp usp/ep standard
cyanocobalamin (vitamin b12)
characteristics |
dark-red crystalline powder or crystals |
|
solubility |
sparingly soluble in water and ethanol(96%),practically insoluble in acetone. |
|
identification |
ratio of optical density a361/a550nm: 3.15~3.40 a361/a278nm: 1.7~1.88 tlc: conforms chemical:positive hplc:the retention time of major peak of the sample solution corresponds to that of the standard solution |
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pseudo cyanocobalamin |
usp(separator) |
|
related substances |
||
total impurities |
≤3.0% |
|
single impurity |
7β,8β-lactocyanocobalamin≤1.0% 50-carboxycyanocobalamin≤0.5% 34-methylcyanocobalamin≤2.0% 32-carboxycyanocobalamin≤1.0% 8-epi-cyanocobalamin≤1.0% any other unidentified impurity≤0.5% |
|
loss on drying |
≤12.0% |
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assay on dried basis |
96.0%~102.0% |
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residual solvents |
acetone: ≤ 1000ppm ethanol: ≤ 1000ppm |
|
total plate count(cfu/g) |
≤ 100 |
|
yeast and mould(cfu/g) |
≤10 |
|
enterobacteriae |
negative |
|
staphylococcus aureus |
negative |
|
pseudomonas aeruginosa |
negative |
|
endotoxin |
<0.35eu/µg |