We are L-Tryptophan CAS:73-22-3 manufacturer and supplier in China, Pls send inquiry of to info@nbinno.com of visit www.nbinno.com our official website should you have any interests

An essential amino acid in human. Not only for protein building, but also important substance as a precursor of niacin, serotonin, melatonin, etc. It is widely used as an ingredient in infusion.

Cas.No 73-22-3
Assay 99.0-101.0%
Specification White to yellowish white crystals or crystalline powder, odorless, slightly bitter taste
Applications Infusion
Packaging 25kg&50kg
Pharmacopeia JP,USP,EP,FCC
STORAGE Controlled room temperature in tight container


State of solution
Not Less Than 95.0%
pH 5.5~6.4
Specific rotation[α]20D -30.5~-32.5°
Specific rotation[α]25D -29.4~-32.8°
Ammonium (NH4) Not More Than 0.020%
Chloride (Cl) Not More Than 0.020%
Sulfate (SO4) Not More Than 0.020%
Iron (Fe) Not More Than 10 ppm
Heavy metals (Pb)** Not More Than 10 ppm
Arsenic (As2O3) Not More Than 1 ppm
Related substances Not More Than 0.5%
Loss on drying Not More Than 0.20%
Residue on ignition Not More Than 0.10%
Endotoxin* Less Than 6.0 EU/g
Assay (dry basis) 99.0~101.0%

· * The endotoxin-certified grade will be supplied on request.
· ** FCC grade (Lead : Not More Than 5 mg/kg) will be supplied on request.
· This product meets requirements of residual solvents listed in the current JP, USP and EP.


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