外观 | A white or almost white, crystalline powder or colourless crystals. |
Solubility | Freely soluble in water,practically insoluble in alcohol. |
Identification test (A,B) | Up to the STANDARD |
Appearance of solution | Clarity of solution:5% water solution should be clear |
Colour of solution:5% water solution should be not more intensively coloured than reference solution BY6 | |
Specific optical rotation | +14.0° to +16.0° |
化验 | 98.5-101.0% |
Chlorides | 200ppm max |
Sulphates | 300ppm max |
Ammonium | 200ppm max |
铁 | 10ppm max |
Heavy metals | 10ppm max |
Loss on drying | 0.5% max |
Sulphated ash | 0.1% max |
Ninhydrin-positive substances (TLC) | Up to the STANDARD |
serine
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