Items             

EP standard      

CP standard 

USP standard 

Assay

≥98.5%

≥98.5%

≥98.5%

Specific rotation

+14.9°— +16.0°

+14.9°— +16.0°

+14.9°— +17.3°

PH value

5.5-6.5

5.5-6.5

5.5-7.0

Light transmittance

≥98.0%

≥98.0%

——

Chloride

≤0.02%

≤0.02%

≤0.05%

Sulfate

≤0.02%

≤0.02%

≤0.03%

Ammonium

≤0.02%

≤0.02%

——

Loss on drying

≤0.2%

≤0.2%

≤0.2%

Residue on ignition

≤0.1%

≤0.1%

≤0.4%

Iron

≤0.001%

≤0.001%

≤0.003%

Heavy metals

≤0.001%

≤0.001%

≤0.0015%

Arsenic

≤0.0001%

≤0.0001%

≤0.0001%

Bacterial endotoxin

The amount of bacterial endotoxin in every 1g of this product should be less than 25EU

The amount of bacterial endotoxin in every 1g of this product should be less than 25EU

——

Heteroacid

Valine≤0.3％

——

——

Methionine≤0.2％

——

——

Isoleucine≤0.8％

——

——

Phenylalanine≤0.2％

——

——