Product name

Vitamin B12(Cyanocobalamin)

Country of origin

China

Shelf-life

5Years

According as 

USP38

Test items

Specifications 

Test methods

Characters 

Dark red,crystalline powder or dark red crystals.

Visual method

Identification 

A： A361 nm/A278nm ：1.70～1.90
A361 nm/A550nm ：3.15～3.40

USP monograph

B ：Meets USP requirements

USP monograph

C：HPLC:The retention time of the major peak of the sample solution corresponds  to that of the standard solution.

USP monograph

Loss on drying 

≤10.0%

USP monograph/
USP<731>

Assay 

97.0%～102.0%

USP monograph

Related substances 

Total impurities ≤3.0 %

USP monograph

7β,8β-Lactocyanocobalamin ≤ 1.0 %

USP monograph

34-Carboxycyanocobalamin ≤1.0 %

 8-Epi-cyanocobalamin ≤ 1.0 %

50-Carboxycyanocobalamin/32-Carboxycyanocobalamin /Any other unidentified impurity ≤0.5%

Residual solvent 

Acetone  ≤0.5 % 

In house/(GC)

Total plate count 

≤800 cfu/g

USP<2021>

Yeasts and Molds 

≤80 cfu/g

USP<2021>

E.coli

Negative/g 

USP<2022>

Conclusion ：        The product complies with the specification of USP 38