China Amino Acid CAS No 73-22-3 L-Tryptophan Tryptophan

Tests
Limits
Test results
DescriptionWhite to slightly yellowish-white crystals or crystalline powder
conformsIdentification(IR)concordant with the reference spectrumconformsSolubilitySoluble in hot alcohol and in dilute hydrochloric acid.conformsAssay(on dried basis)98.5~101.5%99.3%PH5.5~7.05.7Specific rotation[a]D
25-29.4°~-32.8°-32.3°Chloride(Cl)≤0.05%<0.05%Sulfate(SO4)≤0.03%<0.03%Iron(Fe)≤30ppm<30ppm
Organic impuritiesTotal impurities 1≤0.01% Total impurities 2≤0.03% Tryptophan related compound
A ≤10ppm
conformsLoss on drying≤0.30%0.08%Residue on ignition≤0.10%0.02%
Conclusion: Passed Standard of USP41.