L-tryptophan:
1)Description: White to yellowish white crystals or crystalline powder.
2)Use: Tryptophan is heterocyclic amino acid, is a kind of important and necessary amino acids for human body. It is widely applied in pharmaceutical and food fields.
3)Quality Index:
Tests | Limits | Test results | |
Description | White crystals or crystalline powder | conforms | |
Identification(IR) | concordant with the reference spectrum | conforms | |
assay | 98.5~101.5% | 99.7% | |
PH | 5.5~7.0 | 5.8 | |
Specific rotation[a]D25 | -29.4°~-32.8° | -31.3° | |
Chloride(Cl) | ≤0.05% | <0.05% | |
Sulfate(SO4) | ≤0.03% | <0.03% | |
Iron(Fe) | ≤30ppm | <30ppm | |
Heavy metals(Pb) | ≤15ppm | <15ppm | |
Loss on drying | ≤0.30% | 0.11% | |
Residue on ignition | ≤0.10% | 0.05% | |
Organic volatile impurities | meets the requirements | conforms | |
Conclusion |
Passed test according to the Standard of USP24. | ||
Company Name: Qingdao Dacon Trading Co., Ltd
Registered Address:No. 519, Workshop On 5/F, 1 Hancheng Rd., Free Trade Zone, Qingdao, Shandong, China (Mainland)
Legal Representative/CEO: Ms. Shuming Kang
Registration No.: 91370220747213098M
