L-Cysteine | CAS No. 52-90-4

L-Cysteine

Basic Information

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CAS Number

52-90-4

Molecular Formula

C3H7NO2S

Molecular Weight

121.16 g/mol

Chemical Classification

Basic Chemical Raw Materials Organic Chemicals Carboxylic Acids

Basic Chemical Raw Materials Organic Chemicals Amines

Water Treatment Chemicals Coagulants and Flocculants Inorganic Coagulants

Basic Physical Properties

Melting Point

220?°C (dec.)

Boiling Point

293.9°C at 760 mmHg

Water Solubility

280 g/L (25 oC)

Flash Point

131.5°C

Solubility

H2O: 25 mg/mL

Refractive Index

8.8 ° (C=8, 1mol/L HCl)

Vapor Pressure

6.73X10-7 mm Hg at 25 °C (est)

Specific Rotation

8.75 º (c=12, 2N HCl)

SMILES

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

InChI

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

InChIKey

XUJNEKJLAYXESH-REOHCLBHSA-N

LogP

-0.6719000000000002

pKa

1.92(at 25℃)

Topological Polar Surface Area

63.32000000000001 Å²

Hydrogen Bond Donor/Acceptor

3 / 3

Complexity

75.3

Safety Information

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GHS Hazard Pictograms

H302

Hazard Statement

H302 Harmful if swallowed
Acute toxicity, oral

Storage Conditions

2-8℃

Stability

Stability Stable, but may be air sensitive. Incompatible with oxidizing agents, bases.

Sensitiveness

Air Sensitive

Synonyms & References

English

L-Cysteine
(+)-2-Amino-3-mercaptopropionic acid
2-Amino-3-mercaptopropanoic acid
Cys
CySH
Cysteine
L-CYSTEINE FREE BASE CRYSTALLINE
(S)-(-)-Cysteine
CYSTEINE, L-(P)
CYSTEINE, L-(RG)
H-Cys-OH
2R)-2-amino-3-[(4-methylphenyl)methylsulfanyl]propanoicacid
(R)-2-Amino-3-mercaptopropionic acid
Cystein
E 920
FEMA 3263
L-2-AMino-3-Mercaptopropanoic acid
L-Cys
L-Cysteine Base
L-α-AMino-β-thiopropionic acid
Thioserine
L-beta-Mercaptoalanine
Half-cystine
(R)-Cysteine
(R)-2-Amino-3-mercaptopropanoic acid
L-(+)-Cysteine
L-Cystein
(2R)-2-amino-3-sulfanylpropanoic acid
beta-Mercaptoalanine
Half cystine
FREE CYSTEINE

MDL Number

MFCD00064306

Customs Code

2930901000

FAQ

What is L-Cysteine (CAS: 52-90-4)?

L-Cysteine is an amino acid with the chemical formula C3H7NO2S. It is a naturally occurring compound in the human body and is commonly used as a dietary supplement. L-Cysteine is known for its role in protein synthesis and as a precursor to glutathione, which supports immune function and detoxification. It is also used in various industries due to its unique properties, such as its ability to act as a reducing agent and chelating agent. L-Cysteine is available in both crystalline and powdered forms and is often used in pharmaceutical and food applications.

What are the main uses of L-Cysteine (CAS: 52-90-4)?

L-Cysteine has diverse applications, including pharmaceuticals, food, and industrial uses. It is used in drug formulations to enhance stability and solubility. In the food industry, it serves as a flavor enhancer and antioxidant. L-Cysteine is also added to nutritional supplements to support immune health and skin integrity. Additionally, it is used in cosmetic products and as a stabilizer in various chemical processes. Its role as a reducing agent makes it valuable in research and manufacturing.

Is L-Cysteine (CAS: 52-90-4) safe?

L-Cysteine is generally considered safe when used in recommended amounts. It is well-tolerated by most people and is approved for use in food and pharmaceutical products. However, high doses may cause gastrointestinal discomfort. Proper handling, such as using gloves and ensuring good ventilation, is recommended during industrial applications. Safety standards ensure that L-Cysteine is produced and used under controlled conditions to minimize risks.

How should L-Cysteine (CAS: 52-90-4) be stored?

L-Cysteine should be stored in a cool, dry, and dark place to maintain its stability and prevent degradation. It is best kept in a sealed container away from moisture and air exposure. Storage temperatures should not exceed 25°C (77°F), and humidity levels should be below 60%. Avoid direct sunlight and ensure proper labeling to prevent contamination or misuse.