- Product Detail
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L-Tryptophan AJI97 USP2025 EP11 JP18 Appearance White to yellowish white crystals or crystalline powder White to slightly yellowish-white crystals or crystalline powder White or almost white, crystalline or amorphous powder White to yellowish white, crystals or crystalline powder ldentification Conform Conform IR:Conform to CRS Spectrum IR: Conform to CRS Spectrum State of solution
(Transmittance)Clear,
≥95.0%/ / / Specific rotation 
-30.5° ~ -32.5° / -33.0° ~ -30.0° (dried substance) -30.0° ~ -33.0° Optical rotation 
/ -29.4º ~ -32.8º / / Chloride ≤0.020% ≤0.05% ≤200ppm ≤0.021% Sulfate ≤0.020% ≤0.03% ≤300ppm ≤0.028% Ammonium ≤0.02% / ≤0.02% ≤0.02% Iron ≤20ppm ≤30ppm ≤20ppm / Heavy metals ≤10ppm / / ≤20ppm Arsenic ≤1ppm / / ≤2ppm Other amino acids Conform / / / Loss on drying ≤0.20% ≤0.3% ≤0.5% ≤0.30% Residue on ignition ≤0.10% ≤0.1% ≤0.1% ≤0.1% pH 5.5 ~ 6.4 5.5 ~ 7.0 / 5.4 ~ 6.4 Assay 99.0% ~ 101.0% 98.5% ~ 101.5% (on the dried basis) 98.5% ~ 101.0% (dried substance) ≥98.5% Related compounds / Total impurities 1: ≤0.01% Impurity A: ≤10ppm Conform Total impurities 2: ≤0.03% Sum of impurities with a retention time less than that of tryptophan: ≤ 100ppm Tryptophan related compound A: ≤10ppm Sum of impurities with a retention time greater than that of tryptophan and up to 1.8 times the retention time of N-acetyltryptophan: ≤ 300ppm Appearance of solution / / The solution is clear and not more intensely coloured than reference solution BY6 Clear Ninhydrin-positive
substances/ / Any ninhydrin-positive substance:
each impurity: ≤0.2%/ Total: ≤0.5%
L-Tryptophan
CAS No.: 73-22-3
Molecular formular: C11H12N2O2
Molecular weight: 204.23
Molecular formular: C11H12N2O2
Molecular weight: 204.23
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Shijiazhuang Jirong Pharmaceutical Co., Ltd.
Address: No.8 North of Huagong Road, Circular Chemical Industry Zone, Shijiazhuang, Hebei, China
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