Model Number

EP5;USP26

Product Name: L-Tryptophan

CAS No.: 73-22-3                                     

Items	Limits
Appearance	A white or almost white, crystalline or amorphous powder
State of solution	Clear and not more intensely coloured than reference solution BY6
Specific rotation	-30.0~-33.0°
Ninhydrin-positiv substances	Not more intense than the spot with reference solution (0.5%)
1,1’-Ethylidenebis- tryptophan	≤10ppm
Chlorides	≤200ppm
Sulphates	≤300ppm
Ammonium	≤200ppm
Iron	≤20ppm
Heavy metals	≤10ppm
Loss on drying	≤0.50%
Sulphated ash	≤0.10%
Assay	98.5~101.0%