USD $1.00-10.00 / Kilogram
vitamin b12
cyano-5,6-dimethylbenzimidazole-cobalamin; cyanocobalamin; vb12; 5,6-dimethyl-1-(3-o-phosphono-alpha-d-ribofuranosyl)-1h-benzimidazolmonoes
cas no. 68-19-9
specification:usp/bp/ep
chinese gmp
cep
dmf/ctd format
items standard
characteristics dark red crystalline powder or dark red crystals
identification a(uv) absorption maxima at 278nm、361nm and from 547nm to 559nm
ratio absorbances a361/a278nm 1.70-1.90
a361/a550nm 3.15-3.40
identification b(tlc) conforms to standard
identification c(chemistry) positive
identification d(chemistry) positive
pseudo ayanocobalamin complies
related substances(hplc) ≤3.0%
loss on drying ≤12.0%
assay (on dry basis)(uv) 96.0-100.5%
residue solvent(gc)
acetone ≤0.5%
total plant count(plant culture) ≤1000cfu/g