Top Quality L-Tryptophan Powder CAS 73-22-3

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L-Tryptophan Powder

Products Description

Name: L-Tryptophan Powder

Cas: 73-22-3

Purity: 99%min


Basic Info:







Stock Availability

In stock

Brand Name

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Product Introduction:

L-Tryptophan is also known as α-aminoindole propionic acid. Molecular formula: C11H12N2O2, white to off-white crystals or crystalline powder. It is odorless or has a slight odor and will appear colored with prolonged exposure. Acid heating in the dark is more stable.

L-Tryptophan powder is easily decomposed when coexisting with other amino acids, sugars and aldehydes. Used as a food fortifier and antioxidant. It is also used in medicine and other fields. L-Tryptophan powder is synthesized from indole aldehyde. It can also be synthesized by trypsin digestion.

Product Nature:

  • Melting point: 289-290°C(dec.)(lit.)
  • Specific optical rotation -31.1º(c=1,H20)
  • Boiling point: 342.72°C(roughestimate)
  • Density 1.34
  • Refractive index -32°(C=1,H2O)
  • Acidity coefficient (pKa) 2.46(at25℃)


Product NameL-Tryptophan Powder
CAS No.73-22-3
Appearance White to light yellow powder
Content99% min
Shelf Life2 years
Packing1kg/bag,25kg/bag or as your requirements

Product function:

  • For the human body:
    • L-tryptophan powder can be used as a nutritional supplement. Antioxidants. Tryptophan is the precursor of the human body’s important neurotransmitter serotonin and one of the essential amino acids.
    • As a nutritional supplement for pregnant women, as a special formula for infants and young children.
    • It is used to treat niacin deficiency (pellagra).
    • As a sedative, it can regulate mental rhythm and improve sleep.
  • For animals:
    • L-tryptophan powder can promote animal feeding, weaken stress response, improve animal sleep, increase fetal antibodies, and improve lactation of dairy cows.
    • Reduce the amount of high-quality dietary protein, reduce feed costs, reduce the amount of dietary protein feed, and save milk powder space.
  • Other:
    • L-tryptophan powder can be used as amino acid medicine. Used for amino acid injection. It is usually combined with iron and vitamins, and combined with VB6 to improve depression and prevent rough skin.
    • L-tryptophan powder is used as a sedative for insomnia, and L-dopa is used to treat Parkinson’s disease. It has carcinogenic effects on laboratory animals. There are side effects such as nausea, loss of appetite, and wheezing. Avoid simultaneous use with monoamine oxidase inhibitors.
    • Used as a nutritional supplement. Tryptophan contained in egg white protein, fish meat and corn meal is a restrictive amino acid, which is found in grains such as rice.
    • L-tryptophan powder can be combined with lysine, methionine and threonine to strengthen amino acids.
    • L-tryptophan powder can be used as a spacer in serum albumin isotachophoresis to meet the growth needs of various microorganisms.


  1. “Nomenclature and Symbolism for Amino Acids and Peptides”. IUPAC-IUB Joint Commission on Biochemical Nomenclature. 1983. Archived from the original on 9 October 2008. Retrieved 5 March 2018.
  2. Ballantyne C (21 November 2007). “Does Turkey Make You Sleepy?”Scientific American. Retrieved 6 June 2013.
  3. Wikipedia


Pre-Sales Service

* Timely reply and 24 hours online, the professional team will provide you with the most favorable prices and high-quality products.

* The sample supports testing and inspection.

* Each batch of products will be tested to ensure that its quality meets user needs.

*Packaging can also be made according to customer requirements.

*Any inquiries will be answered by our relevant personnel within 24 hours.

*We will provide you with commercial invoice, packing list, packing list, COA, health certificate and certificate of origin if you need it. If your market has other special requirements, please let us know.


After-Sales Service

*We will monitor the logistics information in real time and will share the information with you.

* You can consult us at any time if you have any questions about the product, and we will answer you in time.

*If you have any questions about the product, you can report it to us, we will deal with it in time for you, and the product can be returned.


1. ≤50kg, we recommend express delivery, usually called DDU service;

2. ≤500kg, air transportation is generally recommended, usually called FOB, CFR or CIF service;

3.>500kg, sea freight is generally recommended, usually called FOB, CFR or CIF service;

4. For high-value products, please choose air and express to ensure the safety of the products.


Do you accept sample order?

We will make samples before mass production. After the samples are approved by the department and users, we will start mass production. During the production process, we will carry out 100% inspection, and then carry out random inspection before packaging.

How to confirm whether the product quality meets our needs before placing an order?

You can consult us to get free samples of some products, you only need to pay the freight or arrange express delivery to us and get the samples. You can send us the product specifications and requirements you need, and we will manufacture products according to your requirements.

What’s your MOQ?

Our MOQ is 1kg. But usually we can also accept a smaller quantity, such as 100g, if you need it, provided that the sample fee is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.

Learn more about us

Contact us for the latest quotation and free samples of L-Tryptophan Powder

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Packaging and shipping

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L-Tryptophan Powder