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L-Tryptophan

Molecular Formula: C11H12N2O2 

Molecular Weight: 204.23 

CAS No: 73-22-3

L-TryptophanCP2020EP11USP2023
Assay≥99.0%98.5-101.0%98.5-101.5%
PH5.4-6.4/5.5-7.0
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%
Total plate count≤ 1000 CFU/g≤ 1000 CFU/g≤ 1000 CFU/g
Moulds & Yeasts≤ 100 CFU/g≤ 100 CFU/g≤ 100 CFU/g



L-TryptophanUSP32AJI92
Assay98.5-101.5%99.0-100.5%
PH5.5-7.05.4-6.4
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%
Total plate count≤ 1000 CFU/g≤ 1000 CFU/g
Moulds & Yeasts≤ 100 CFU/g≤ 100 CFU/g