Product Detail

L-Tryptophan	AJI92	USP40	EP6.0
Description	White to yellowish white crystals or crystalline powder	/	White or almost white,crystalline or amorphous powder
Identification	Conform	Conform	Conform
Solubility	/	/	Sparingly soluble in water, slightly soluble in ethanol(96 percent). It dissolves in dilute solutions of mineral acids and alkali hydroxides.
Appearance of solution	/	/	The solution is clear and not more intensively coloured than reference solution BY6
Assay	98.5%~100.5%	98.5%~101.5%	98.5%~101.0%
pH	5.4～6.4	5.5~7.0	/
Transmittance	≥95.0%	/	/
Loss on drying	≤0.20%	≤0.3%	≤0.5%
Residue on ignition	≤0.10%	≤0.1%	≤0.1%
Chloride	≤0.020%	≤0.05%	≤200ppm
Heavy Metals	≤10ppm	≤15ppm	≤10ppm
Iron	≤20ppm	≤30ppm	≤20ppm
Sulfate	≤0.020%	≤0.03%	≤300ppm
Ninhydrin-positive substances (TLC)	/	/	Conform
Arsenic	≤1ppm	/	/
Ammonium	≤0.02%	/	≤200ppm
Other amino acids	Meet the requirements	/	/
Pyrongen	Conform	/	/
Specific Rotation	-30.0° ～ -32.5°	-29.4°~ -32.8°	-30.0°～-33.0°
Organic impurities	/	Conforms	/