- Product Detail
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L-Histidine AJI97 USP2025 EP11 JP18 Appearance White crystals or crystalline powder White crystals White or almost white, crystalline powder or colourless crystals White crystals or crystalline powder ldentification Conform Conform IR:Conform to CRS Spectrum IR: Conform to CRS Spectrum State of solution
(Transmittance)Clear and colorless,
≥98.0%/ / / Specific rotation 
+12.0° ~ +12.8° / +11.4° ~ +12.4° (dried substance) +11.8° ~ +12.8° (on the dried basis) Optical rotation / +12.6º ~ +14.0º / / Chloride ≤0.020% ≤0.05% ≤200ppm ≤0.021% Sulfate ≤0.020% ≤0.03% ≤300ppm ≤0.028% Ammonium ≤0.02% / ≤0.02% ≤0.02% Iron ≤10ppm ≤30ppm ≤10ppm ≤10ppm Heavy metals ≤10ppm / / ≤10ppm Arsenic ≤1ppm / / / Other amino acids Conform / / / Loss on drying ≤0.20% ≤0.2% ≤0.5% ≤0.3% Residue on ignition ≤0.10% ≤0.4% ≤0.1% ≤0.1% pH 7.0 ~ 8.5 7.0 ~ 8.5 / 7.0 ~ 8.5 Assay 98.5% ~ 101.0% 98.5% ~ 101.5% (on the dried basis) 98.5% ~ 101.0% (dried substance) 99.0% ~ 101.0% (on the dried basis) Related compounds / Individual impurities: ≤0.5% / Conform Total impurities: ≤2.0% Appearance of solution / / Solution S is clear and not more intensely coloured than reference solution BY7 Clear and colorless Ninhydrin-positive
substances/ / Any ninhydrin-positive substance:
each impurity: ≤0.2%/ Total: ≤0.5%
L-Histidine
CAS No.: 71-00-1
Molecular formular: C6H9N3O2
Molecular weight: 155.15
Molecular formular: C6H9N3O2
Molecular weight: 155.15
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