L-Cysteine monohydrochloride CAS#52-89-1

alpha 

5.5 º (c=8, 6 N HCL)

storage temp. 

Inert atmosphere,Room Temperature

solubility 

H2O: 1 M at 20 °C, clear, colorless

form 

Solid

color 

White to light brown

Odor

odorless

Optical Rotation

[α]20/D +6.4±0.3°, c = 5% in 5 M HCl

biological source

synthetic

Water Solubility 

SOLUBLE

Sensitive 

Hygroscopic

Merck 

14,2781

BRN 

3560277

Stability:

Stable, but light, moisture and air sensitive. Incompatible with strong oxidizing agents, some metals.

Cosmetics Ingredients Functions

HAIR WAVING OR STRAIGHTENING
REDUCING
ANTIOXIDANT
HAIR CONDITIONING

Cosmetic Ingredient Review (CIR)

L-Cysteine monohydrochloride (52-89-1)

InChI

1S/C3H7NO2S.ClH/c4-2(1-7)3(5)6;/h2,7H,1,4H2,(H,5,6);1H/t2-;/m0./s1

InChIKey

IFQSXNOEEPCSLW-DKWTVANSSA-N

SMILES

Cl[H].N[C@@H](CS)C(O)=O

LogP

0.235 (est)

CAS DataBase Reference

52-89-1(CAS DataBase Reference)

NIST Chemistry Reference

L-cysteine hydrochloride(52-89-1)

EPA Substance Registry System

L-Cysteine hydrochloride (52-89-1)

Safety Information

Risk Statements 

36/37/38

Safety Statements 

26-36

WGK Germany 

2

RTECS 

HA2275000

F 

3-10-23

TSCA 

TSCA listed

HS Code 

29309013

Storage Class

11 - Combustible Solids

Toxicity

LD50 intraperitoneal in mouse: 1250mg/kg