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 Manager: Frank Wang
 Tel: 86-25-84204331,84209951


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CAS No.:73-22-3 (80206-30-0)
HS Code:2933990099
Packing:25kg bag/drum/carton
Port of loading:Shanghai ; Qindao;Tianjin
Min. Order:1MT
AppearanceWhite crystals or crystalline powder
Assay98% Min
Specific Rotation-29.0~ -32.3
Loss on Drying0.5% Max
Heavy Metals20mg/kg Max
Arsenic(As2O3)2mg/kg Max
Residue on ignition0.5% 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's your payment terms?
T/T or L/C.

2. What's your delivery time?
Usually we will arrange the shipment in 7 -15 days.

3. How about the packing?
Usually we provide the packing as 25 kg / bag or carton. Of course, if you have special requirements on them, we will according to you.

4. How about the validity of the products?
According to the products you ordered.

5. What documents you provide? 
Usually, we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.

6. What is loading port?
Usually is Shanghai,Qingdao or Tianjin.

Our Services

1.20years industry experience, 4 own factorires, 3 warehouses, sold all over the world

2.High quality products with reasonable price

3.Stable supply with QC center for quality control

4.Updating price trendency and market information

5.Delivery within two weeks after order

6.Over 500 kind of food additives 

7.New sisiter company is engaged to Pharmaceuticals and ingredients

8.A professional sales team





 9/F,Fortune Building,No.359 Hongwu Road,Nanjing
210002, China
  +86-025-84204331 / 84209951

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