Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
L-Tryptophan
1. Basic Product Information
Product Name: L-Tryptophan
CAS Number: 73-22-3
Molecular Formula: C11H12N2O2
Molecular Weight: 204.23
Synonyms: L-2-Amino-3-indolylpropanoic acid, L-Tryptophane
Product Category: Essential amino acid, cell culture medium raw material, food/feed nutritional additive, pharmaceutical intermediate, cosmetic raw material, biochemical standard reagent
2. Physical and Chemical Properties
Physical Indicators
- Appearance: White or off-white crystalline powder
- Odor: Odorless, faint mild bitter taste
- Solubility: Slightly soluble in water; sparingly soluble in hot ethanol; insoluble in acetone, ether, benzene and hydrocarbon solvents
- Melting Point: 281–282 °C (decomposes)
- Specific Rotation [α]D2?: -29.0° ~ -33.0° (c=1, H?O)
- Density (20 °C): 1.34 g/cm3
- Hygroscopicity: Slightly hygroscopic under high humidity conditions
- Aqueous Stability: Stable under neutral and weakly acidic aqueous solutions; prone to oxidative discoloration and degradation under strong alkali, high temperature or long-term UV irradiation
Chemical Characteristics
- Molecular Structure: Chiral essential amino acid with indole heterocyclic side chain, containing one amino group and one carboxyl group
- Core Functional Mechanism: Essential human amino acid that cannot be synthesized endogenously; precursor of serotonin, melatonin and niacin; participates in protein synthesis and nervous system metabolism
- Photostability: Strongly light-sensitive; UV exposure triggers indole ring oxidation to generate brown dark impurities
- Thermal Stability: Stable below 220 °C; decomposes intensely above melting point to release irritating nitrogen-containing volatile fumes
- Chemical Compatibility: Compatible with neutral biological buffers and most cosmetic excipients; incompatible with strong oxidants, concentrated strong alkalis and heavy metal ions
3. Main Application Fields
- Core Application: Food & Feed Nutritional Fortifier
Nutritional supplement for functional food, dairy products, health supplements and animal feed to balance amino acid composition and improve growth performance - Cell & Tissue Culture Reagent
Key component of serum-free cell culture medium for mammalian cell passage, antibody and protein expression culture systems - Pharmaceutical Synthetic Intermediate
Raw material for neuroregulatory, anti-depressant and polypeptide pharmaceutical synthesis; component of compound amino acid injection formulations - Cosmetic Functional Raw Material
Anti-oxidant and skin conditioning additive in anti-aging skincare products - Biochemical Analytical Standard
Reference standard for amino acid chromatographic detection and metabolic pathway research
4. Platform Category & Product Group Guidance
1) Domestic B2B Platform Category
Recommended Path: Organic Intermediates / Biochemical Reagents
Reason: Essential indole amino acid raw material widely used in nutrition, biotech, pharmacy and feed industries
2) English Product Group Dropdown Options
Recommended Selection: Basic Organic Chemicals
Do NOT classify solely as pharmaceutical chemicals; it is universal food-grade biochemical raw material
3. Standard Foreign Trade Packaging Specification
1kg nitrogen-sealed aluminum foil vacuum bag for lab tests; 25kg double PE-lined kraft woven bag or fiber drum for bulk industrial orders
5. Quality Specification Table
| Test Item | Standard Requirement |
| CAS Number | 73-22-3 |
| Molecular Formula | C11H12N2O2 |
| Appearance | Uniform white crystalline powder without yellow/brown discoloration |
| Titration Purity | Food Grade ≥99.0%, Biochemical Grade ≥99.5% |
| Specific Rotation | -29.0° ~ -33.0° |
| Water Content (KF Method) | ≤0.20% |
| Heavy Metals (Pb) | ≤10 ppm |
| Arsenic (As) | ≤2 ppm |
| pH (1% aqueous solution) | 5.5–7.0 |
| Standard Storage Package | Lightproof airtight vacuum aluminum foil bag, dry warehouse storage |
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