L-Tryptophan

L-Tryptophan	CP2020	EP11	USP2023
Assay	≥99.0%	98.5-101.0%	98.5-101.5%
PH	5.4-6.4	/	5.5-7.0
Specific rotation[a]D20	-30.0°–32.5°	-30.0°–33.0°	/
Specific rotation[a]D25	/	/	-29.4°–32.8°
Transmittance(T430)	≥95.0%	/	/
Appearance of solution	/	clear & colorless ≤BY6	/
Chloride(Cl)	≤0.02%	≤0.02%	≤0.05%
Ammonium(NH4)	≤0.02%	≤0.02%	/
Sulfate(SO4)	≤0.02%	≤0.03%	≤0.03%
Iron(Fe)	≤20PPM	≤20PPM	≤30PPM
Heavy metals(Pb)	≤10PPM	/	/
Arsenic	≤1PPM	/	/
Other amino acids	≤0.50%	Impurity A≤10ppm Sum of impurities with a retention time less than that of Tryptophan <100ppm Sum of impurities with a retention time great than that of Tryptophan and up to 1.8 time of N-acetyltryptophan <300ppm	Total impurities 1≤0.01% Total impurities 2≤0.03% Tryptophan related compound A ≤10PPM
Ninhydrin-positive substances	/	Each impurity≤0.2% Total impurities≤0.5%	/
Loss on drying	≤0.20%	≤0.50%	≤0.30%
Residue on ignition	≤0.10%	≤0.10%	≤0.10%
Endotoxin	<50EU/g	<50EU/g	<50EU/g
Total plate count	≤ 1000 CFU/g	≤ 1000 CFU/g	≤ 1000 CFU/g
Moulds & Yeasts	≤ 100 CFU/g	≤ 100 CFU/g	≤ 100 CFU/g

L-Tryptophan	USP32	AJI92
Assay	98.5-101.5%	99.0-100.5%
PH	5.5-7.0	5.4-6.4
Specific rotation[a]D20	/	-30.5°–32.5°
Specific rotation[a]D25	-29.4°–32.8°	/
Transmittance(T430)	/	≥95.0%
Appearance of solution	/	/
Chloride(Cl)	≤0.05%	≤0.02%
Ammonium(NH4)	/	≤0.02%
Sulfate(SO4)	≤0.03%	≤0.02%
Iron(Fe)	≤30PPM	≤20PPM
Heavy metals(Pb)	≤15PPM	≤10PPM
Arsenic	/	≤1PPM
Other amino acids	/	conform
Ninhydrin-positive substances	/	/
Loss on drying	≤0.30%	≤0.20%
Residue on ignition	≤0.10%	≤0.10%
Endotoxin	/	/
Total plate count	≤ 1000 CFU/g	≤ 1000 CFU/g
Moulds & Yeasts	≤ 100 CFU/g	≤ 100 CFU/g

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