L-Tryptophan

L-Tryptophan 

IUPAC name

Tryptophan or (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid

Other names

2-Amino-3-(1H-indol-3-yl)propanoic acid

Identifiers 

CAS number

73-22-3 

PubChem

6305

ChemSpider

6066 

UNII

8DUH1N11BX 

ChEMBL

CHEMBL54976 

IUPHAR ligand

717

ATC code

N06AX02

Properties 

Molecular formula

C₁₁H₁₂N₂O₂

Molar mass

204.23 g mol⁻¹

Solubility inwater

Soluble: 0.23 g/L at 0 °C,

11.4 g/L at 25 °C,
17.1 g/L at 50 °C,
27.95 g/L at 75 °C

Solubility

Soluble in hot alcohol, alkali hydroxides; insoluble in chloroform.

Acidity (pK_a)

2.38 (carboxyl), 9.39 (amino)

Test Items

PECIFICATION

Description:

White or yellow slightly

Specific Rotation:

–30.50 to –32.5degree  

PH:

5.5~6.4                                     

Chloride (Cl):

0.05% Max                                      

Sulfate:

NMT0.03%                                     

Heavy Metals:

NMT 0.0015%                                     

Arsenic:

NMT1ppm                                           

Iron:

NMT 0.003%                             

Loss on drying:

NMT 0.3%                   

Residue on Ignition:

NMT 0.1%                                       

Assay:

99.0-101.0%