L-TryptophanCAS#73-22-3

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.

Cosmetics Ingredients Functions

HAIR CONDITIONING
ANTISTATIC
FRAGRANCE

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

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).