ITEMS	STANDARDs
Appearance	White crystals or crystalline powder
Assay	98% Min
Specific Rotation	-29.0~ -32.3
Loss on Drying	0.5% Max
Heavy Metals	20mg/kg Max
Arsenic(As2O3)	2mg/kg Max
Residue on ignition	0.5% Max

Tryptophan (IUPAC-IUBMB abbreviation: Trp or W; IUPACabbreviation: L-Trp or D-Trp; sold for medical use as Tryptan) is one of the 22standard amino acids and an essential amino acid in the human diet, asdemonstrated by its growth effects on rats. It is encoded in the standardgenetic code as the codon UGG. Only the L-stereoisomer of tryptophan is used instructural or enzyme proteins, but the R -stereoisomer is occasionally found innaturally produced peptides (for example, the marine venom peptide contryphan).The distinguishing structural characteristic of tryptophan is that it containsan indole functional group.

There isevidence that blood tryptophan levels are unlikely to be altered by changingthe diet, but for some time, tryptophan has been available in health foodstores as a dietary supplement.

Clinicalresearch has shown mixed results with respect to tryptophan's effectiveness asa sleep aid, especially in normal patients. Tryptophan has shown someeffectiveness for treatment of a variety of other conditions typicallyassociated with low serotonin levels in the brain. In particular, tryptophanhas shown some promise as an antidepressant alone and as an"augmenter" of antidepressant drugs. However, the reliability ofthese clinical trials has been questioned because of lack of formal controlsand repeatability. In addition, tryptophan itself may not be useful in thetreatment of depression or other serotonin-dependent moods, but may be usefulin understanding the chemical pathways that will give new research directionsfor pharmaceuticals.

1, What kinds of certificates can you offer?

Foodchem is an ISO2008 9001 certified company, as for L-Tryptophan, we can offer HAPPC, KOSHER, HALAL Certificates, ect.

2, Is Foodchem a manufacturer or just a trading company?

Foodchem is both manufacturer and trading company, we are L-Tryptophan distributor, at the same time, we are manufacturer of other products.

3, What is the Min Order Quantity of L-Tryptophan?

Different products have different MOQ, for L-Tryptophan, the MOQ is 500kg.

4, What is the price of L-Tryptophan?

Foodchem is a famous supplier and manufacturer of L-Tryptophan in China, and has been corporate with many L-Tryptophan suppliers for several years, we can provide you with cost-effective L-Tryptophan.

5, How long shall we wait for your reply?

We can guarantee to reply your inquiries of L-Tryptophan in less than 24 hours in working days.

6, What kinds of transportation types can you provide?

Our main transportation methods include air transportation, land transportation and water transportation.

7, What kinds of payment terms can you accept?

The most commonly used payment terms are T/T, L/C, D/P, D/A, etc.

8, How long will I receive my good?

Foodchem has its own EDC warehouse in Shanghai, when your purchase order has been confirmed, inventory products will deliver within 1 week, other products delivery in 2 weeks.