L-Histidine

USP40

AJI92

EP6

Assay

98.5-101.5%

99.0-101.0%

98.5-101.0%

PH

7.0-8.5

7.0-8.5

/

Transmittance

/

Clear and colorless ≥98.0%

/

Specific rotation[a]D20

/

+12.0°-+12.8°

/

Specific rotation[a]D25

+12.6°-+14.0°

/

+11.4°-+12.4

Chloride(Cl)

≤0.05%

≤0.02%

≤0.02%

Ammonium(NH4)

≤0.02%

≤0.02%

Sulfate(SO4)

≤0.03%

≤0.02%

≤0.03%

Iron(Fe)

≤30PPM

≤10PPM

≤10PPM

Heavy metals(Pb)

≤15PPM

≤10PPM

≤10PPM

Arsenic (As2O3)

/

≤1PPM

/

Other amino acids

individual impurities≤0.5% total impurities≤2.0%

Confirms

/

Ninhydrin-positive substances

/

/

Confirm

Loss on drying

≤0.20%

≤0.20%

≤0.50%

Residue on ignition

≤0.40%

≤0.10%

≤0.10%