l-histidine histidine l-histidine powder
Test Items
|
Specification
|
Assay
|
≥99.0%
|
Characteristic
|
White or almost white, crystals or crystalline powder,
Odorless, slightly bitter taste.
|
Specific rotation[a]D
|
+12.0°~ +12.8°
|
Identification
|
AS PER CP2010
|
PH
|
7.0~8.5
|
Transmittance
|
≥98.0%
|
Chloride
|
≤0.02%
|
Sulfate
|
≤0.02%
|
Ammonium
|
≤0.02%
|
Other amino acids
|
≤0.5%
|
Loss on drying
|
≤0.2%
|
Residue on ignition
|
≤0.1%
|
Iron
|
≤0.001%
|
Heavy metals(as Pb)
|
≤10ppm
|
Arsenic
|
≤0.0001%
|
Bacterial endotoxins
|
≤6.0 EU/g
|
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