histidine

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Description
Appearance White crystals or crystalline powder
Assay(%) 99.0 – 101.0
Loss on drying(%) 0.20 Max
Residue on ignition(%) 0.10 Max
pH 7.0~8.5
Specific rotation(°) +12.0 – +12.8
State of solution(%) 98.0 Min
Chloride(%) 0.020 Max
Ammonium(%) 0.02 Max
Sulfate(%) 0.020 Max
Iron(ppm) 10 Max
Heavy metals(ppm) 10 Max
Arsenic(ppm) 1 Max
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