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Product Description
L-Tryptophan#73-22-3
L-tryptophan is the L-enantiomer of tryptophan. It has a role as an antidepressant, a nutraceutical, a micronutrient, a plant metabolite, a human metabolite, a Saccharomyces cerevisiae metabolite, an Escherichia coli metabolite and a mouse metabolite. It is an erythrose 4-phosphate/phosphoenolpyruvate family amino acid, a proteinogenic amino acid, a tryptophan and a L-alpha-amino acid. It is a conjugate base of a L-tryptophanium.

L-Tryptophan Chemical Properties |
Melting point | 289-290 °C (dec.)(lit.) |
alpha | -31.1 º (c=1, H20) |
Boiling point | 342.72°C (rough estimate) |
density | 1.34 |
bulk density | 400kg/m3 |
refractive index | -32 ° (C=1, H2O) |
storage temp. | 2-8°C |
solubility | 20% NH3: 0.1 g/mL at 20 °C, clear, colorless |
form | powder |
pka | 2.46(at 25℃) |
color | White to yellow-white |
PH | 5.5-7.0 (10g/l, H2O, 20℃) |
Odor | wh. cryst. or cryst. odorless powd., sl. bitter taste |
biological source | non-animal source |
Optical Rotation | [α]20/D 31.5±1°, c = 1% in H2O |
Water Solubility | 11.4 g/L (25 ºC) |
Merck | 14,9797 |
BRN | 86197 |
Stability: | Stable. Incompatible with strong acids, strong oxidizing agents. |
InChIKey | QIVBCDIJIAJPQS-VIFPVBQESA-N |
LogP | 0.704 (est) |
CAS DataBase Reference | 73-22-3(CAS DataBase Reference) |
NIST Chemistry Reference | L-Tryptophan(73-22-3) |
EPA Substance Registry System | L-Tryptophan (73-22-3) |
Absorption | cut-off at 326nm in 0.5 M HCl at 0.5M |
Safety Information |
Hazard Codes | Xi |
Risk Statements | 33-40-62-41-37/38-36/37/38-22 |
Safety Statements | 24/25-36/37/39-36-26 |
WGK Germany | 2 |
RTECS | YN6130000 |
F | 8 |
TSCA | Yes |
HS Code | 29339990 |
Hazardous Substances Data | 73-22-3(Hazardous Substances Data) |
Toxicity | LD508mmol / kg (rat, intraperitoneal injection). It is safe when used in food (FDA, §172.320, 2000). |
Product Usage
L-tryptophan is an essential amino acid which is necessary for normal growth in infants and for nitrogen balance in adults. It acts as a natural dietary supplement and used as an antidepressant, anxiolytic and sleep aid. It is used as a precursor to niacin, indole alkaloids and serotonin. It acts as an important intrinsic fluorescent probe, which finds to estimate the nature of microenvironment of the tryptophan.
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