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L - Tryptophan Amino Acid For Dietary Supplement , CAS 73-22-3 L - Tryptophan Powder 

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L - Tryptophan Amino Acid For Dietary Supplement , CAS 73-22-3 L - Tryptophan Powder 

China L - Tryptophan Amino Acid For Dietary Supplement , CAS 73-22-3 L - Tryptophan Powder  supplier

Large Image :  L - Tryptophan Amino Acid For Dietary Supplement , CAS 73-22-3 L - Tryptophan Powder 

Product Details:

Place of Origin: China
Brand Name: PooChun
Model Number: CAS 73-22-3

Payment & Shipping Terms:

Minimum Order Quantity: Negotiable
Price: Negotiable
Packaging Details: 1~10kg / Al-Pt bag, 10kg / 25kg fiber drum
Delivery Time: 1-3days after payment
Payment Terms: T/T, L/C
Supply Ability: 5000kg per Month
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Detailed Product Description
MF: C11H12N2O2 Assay: ≥ 98.5%
Appearance: White Powder MW: 204.23
Standard: USP, EP, AJI, CP, FCC Use: Dietary Supplement
Test Method: HPLC Shipping: DHL TNT FedEx EMS UPS By Sea By Air
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L-Tryptophan Amino Acid Powder for dietary supplement and insomnia and depression CAS 73-22-3


L-Tryptophan is an important precusor substance of auxin biosynthesis in plant. It has the similar structure of IAA. It widely exists in higher plant. There are two ways to synthetic auxin. The first is tryptophan oxidizes and deaminize and form indole acetone,then decarboxylation and form IAAId; Under the corresponding enzymes IAAId oxsidizes indoleacetic acid. The second way is decarboxylation and form to tryptamine then tryptamine oxsidize deamination finally forms tryptophan.


L-Tryptophan ( abbreviated as Trp or W; encoded by the codon UGG ) is an α-amino acid that is used in the biosynthesis of proteins. It contains an α-amino group, an α-carboxylic acid group, and a side chain indole, classifying it as a non-polar, aromatic amino acid. It is essential in humans, meaning the body cannot synthesize it and thus it must be obtained from the diet. Tryptophan is also a precursor to the neurotransmitter serotonin and the hormone melatonin.

Like other amino acids, tryptophan is a zwitterion at physiological pH where the amino group is protonated (–NH3+; pKa = 9.39) and the carboxylic acid is deprotonated ( –COO−; pKa = 2.38).



Use as a dietary supplement


L-Tryptophan is sold over the counter in the United States ( after being banned to varying extents between 1989 and 2005 ) and the United Kingdom as a dietary supplement for use as an antidepressant, anxiolytic, and sleep aid. It is also marketed as a prescription drug in some European countries for the indication of major depression under various trade names.


Since L-tryptophan is converted into 5-hydroxytryptophan ( 5-HTP ) which is subsequently converted into the neurotransmitter serotonin, it has been proposed that consumption of tryptophan or 5-HTP may therefore improve depression symptoms by increasing the level of serotonin in the brain. In 2001 a Cochrane Review of the effect of 5-HTP and tryptophan on depression was published. The authors included only studies of a high rigor and included both 5-HTP and tryptophan in their review because of the limited data on either. Of 108 studies of 5-HTP and tryptophan on depression published between 1966 and 2000, only two met the authors' quality standards for inclusion, totaling 64 study participants. The substances were more effective than placebo in the two studies included but the authors state that "the evidence was of insufficient quality to be conclusive" and note that "because alternative antidepressants exist which have been proven to be effective and safe, the clinical usefulness of 5-HTP and tryptophan is limited at present". The use of tryptophan as an adjunctive therapy in addition to standard treatment for mood and anxiety disorders is not supported by the scientific evidence. Due to the lack of high-quality studies and preliminary nature of studies showing effectiveness and the lack of adequate study on their safety, the use of tryptophan and 5-HTP is not highly recommended or thought to be clinically useful.


There is evidence that blood tryptophan levels are unlikely to be altered by changing the diet, but tryptophan is available in health food stores as a dietary supplement. Consuming purified tryptophan increases brain serotonin level, whereas eating foods containing tryptophan does not. This is because the transport system, which brings tryptophan across the blood-brain barrier, is also selective for the other amino acids, which are contained in protein food sources. High blood plasma levels of other large neutral amino acids prevent the plasma concentration of tryptophan from increasing brain concentration levels.





1. 25kg woven bag or compound brown paper bag with plastic lining
2. 500kg or 1,000kg woven bag with plastic lining
3. As per clients' requirements



L-Tryptophan USP32 AJI92 CP2015 ( Injection Grade ) EP8
Assay 98.5-101.5% 99.0-100.5% ≥99.0% 98.5-101.0%
PH 5.5-7.0 5.4-6.4 5.4-6.4 /
Specific rotation[a]D20 / -30.5°--32.5° -30.0°--32.5° -30.0°--33.0°
Specific rotation[a]D25 -29.4°--32.8° / / /
Transmittance(T430) / ≥95.0% ≥95.0% clear & colorless ≤BY6
Chloride(Cl) ≤0.05% ≤0.02% ≤0.02% ≤0.02%
Ammonium(NH4) / ≤0.02% ≤0.02% ≤0.02%
Sulfate(SO4) ≤0.03% ≤0.02% ≤0.02% ≤0.03%
Iron(Fe) ≤30PPM ≤20PPM ≤20PPM ≤20PPM
Heavy metals(Pb) ≤15PPM ≤10PPM ≤10PPM ≤10PPM
Arsenic / ≤1PPM ≤1PPM /
Other amino acids / conform ≤0.50%
Impurity A≤10ppm
Sum of impurities with a retention time less than that of Tryptophan <100ppm
Sum of impurities with a retention time great than that of Tryptophan and up to 1.8 time of N-acetyltryptophan <300ppm
Ninhydrin-positive substances / / / conform
Loss on drying ≤0.30% ≤0.20% ≤0.20% ≤0.50%
Residue on ignition ≤0.10% ≤0.10% ≤0.10% ≤0.10%
Organic volatile impurities / / / /
Endotoxin / / <50EU/g /


Amino Acid Powder product list


Product name CAS #   Product name CAS #
L-Isoleucine 73-32-5 L-Lysine Hydrochloride 657-27-2
L-Valine 72-18-4 L-Methionine 63-68-3
L-Leucine 61-90-5 L-Asparagine H2O 5794-13-8
L-Phenylalanine 63-91-2 INSTANTIZED BCAA /
L-Proline 147-85-3 L-Hydroxyproline 51-35-4
L-Tryptophan 73-22-3 L-Arginine hydrochloride 1119-34-2
L-Lysine Acetate 57282-49-2 L-Asparagine 70-47-3
L-Glutamic Acid 56-86-0 BETA-Alanine 107-95-9
L-Threonine 72-19-5 L(+)-Citrulline 372-75-8
L-Tyrosine 60-18-4 L-histidine dihydrochloride 1007-42-7
L-Arginine Hcl 1119-34-2 L(+)-Lysine monohydrochloride 657-27-2
L-Serine 56-45-1 D(-)-Aspartic acid 1783-96-6
L-Cysteine hydrochloride 7048/4/6 L-Methionine 63-68-3
L-Arginine 74-79-3 DL-Methionine 59-51-8
L-Glutamine 56-85-9 L-Cystine 56-89-3
L-Alanine 56-41-7 L(+)-Cysteine 52-90-4
L-Histidine 71-00-1 L-arginine L-aspartate 7675-83-4
L-Histidine Hcl 5934-29-2 N-acetyl-L-Tyrosine 537-55-3
L-Aspartic Acid 56-84-8 N-Acetyl-L-cysteine 616-91-1
Glycine 56-40-6 BCAA /

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