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L-Cysteine 52-90-4

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CAS No.:

52-90-4

Grade:

Food Grade

Port:

Shanghai

Packaging:

25KG

Price valid (until):

2022-03-18

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zhengjiang langbo pharma

Company Type:

Manufactory

Location:

China

Qualification:

Main Products:

Calcium polystyrene sulfonate,Megestrol Acetate,Eperisone Hydrochloride

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Product Description
Seller Information
Inquiry History

Description

Product Detail

L-cysteine, also known as cysteine, is a non-essential amino acid of human body, amino acid is the component unit of protein, protein is the material basis of life, from human beings to microorganisms, all of which are not composed of protein. Proteins are composed of peptides whose peptide chains are composed of amino acids. Different proteins are composed of peptide chains of different sequences and lengths of amino acids. The genes involved in heredity are actually different sequences of amino acids. L-cysteine is closely related to cystine, and two cysteine molecules form a molecule of cystine. Cysteine is unstable and easily changed into cysteine, which can also be reduced to cysteine. Both are sulfur-containing amino acids that contribute to skin formation and detoxification. L-cysteine is found in keratin, the main protein that makes up nails, toenails, skin chemicalbooks, and hair. L-cysteine assists in the production of collagen tissue, which maintains skin elasticity and texture. It is also related to the protein of digestive enzymes, cysteine can supply - SH group to many important enzymes in the body, such as succinate dehydrogenase, lactate dehydrogenase and so on. L-cysteine is mainly used in cosmetics, medicine and food fields. In cosmetics, it is used to prepare perm essence, sunscreen, hair perfume and hair tonic essence, etc. In the medical field, it can be used to prepare methyl cysteine, ethyl cysteine, acetylcysteine, methyl cysteine, ethyl cysteine and

Basic Info

Product Name:

L-(+)-Cysteine

Other Name:

L-Cysteine;Cysteine,L-;Half-cystine;β-Mercaptoalanine;Thioserine;L-(+)-Cysteine;Cysteine;Propanoic acid,2-amino-3-mercapto-,(R)-;Cystein;L-Alanine,3-mercapto-;NSC 8746;(R)-2-Amino-3-mercaptopropanoic acid;(R)-Cysteine;2-Amino-3-mercaptopropionic acid;L-Cys;E 920;(R)-2-Amino-3-mercaptopropanoic acid;(R)-2-Amino-3-sulfanylpropanoic acid;(2R)-2-Amino-3-sulfanylpropanoic acid;2-Amino-3-mercaptopropanoic acid;11: PN: WO2021055880 SEQID: 12 claimed protein;4371-52-2;154605-72-8;1404190-35-7

CAS No.:

52-90-4

Molecular Formula:

C3H7NO2S

InChIKeys:

InChIKey=XUJNEKJLAYXESH-REOHCLBHSA-N

Molecular Weight:

121.15800

Exact Mass:

121.16

EC Number:

200-158-2

UNII:

K848JZ4886

DSSTox ID:

DTXSID8022876

NCI Thesaurus Code:

C29609

Color/Form:

Colorless crystals|White crystals

HScode:

2930901000

Categories:

Other Chemical Drugs

Characteristics

PSA:

102.12000

XLogP3:

-2.5

Appearance:

DryPowder

Density:

1.6666 g/cm³ @ Temp: 45.00 °C

Melting Point:

240 °C (decomp)

Boiling Point:

293.9ºC at 760 mmHg

Flash Point:

131.5ºC

Refractive Index:

8.8 ° (C=8, 1mol/L HCl)

Water Solubility:

H2O: 280 g/L (25 ºC)

Storage Conditions:

Store at RT.

Vapor Pressure:

6.73X10-7 mm Hg at 25 deg C (est)

Toxicity:

LD50 orally in Rabbit: 1890 mg/kg

Specific rotation:

Specific optical rotation: +6.5 deg at 25 °C/D (5 N HCl); +13.0 deg at 25 °C/D (glacial acetic acid)

PKA:

1.71None

Henrys Law Constant:

Henry's Law constant = 5.30X10-11 atm-cu m/mol at 25 °C (est)

Dissociation Constants:

1.71|pK1 1.71 /carboxylic/; pK2 8.33 /amine/; pK3 10.78 /sulfide/

Collision Cross Section:

149.57 Å² [M+H]+ [CCS Type: DT, Method: stepped-field]|151.34 Å² [M+Na]+ [CCS Type: DT, Method: stepped-field]|144.47 Å² [M-H]- [CCS Type: DT, Method: stepped-field]|113 Å² [M+H]+ [CCS Type: TW, Method: calibrated with polyalanine]|144 Å² [M-H]-

Experimental Properties:

Readily oxidizes to form a dimeric amino acid, cystine, in which the two cysteines are linked via a disulfide bridge, a common structural feature in proteins. Amino Acids and Proteins, D.M. Greenberg, Ed. (Charles C. Thomas, Springfield, IL, 1951) 950 pp.|In neutral or slightly alkaline aqueous solution it is oxidized to cystine by air. More stable in acidic solutions.|MP (anhydrous): 178 °C (decomposes). Specific optical rotation: +6.53 deg at 25 °C/D (calculated as cysteine) (c = 2 in 5M HCl); solubility >100 (20 °C) g/100 g H2O /L-Cysteine hydrochloride monohydrate/|Hydroxyl radical reaction rate constant = 7.96X10-11cu cm/molecule-sec at 25 °C (est)

See More L-(+)-Cysteine Properties 

Hazard Identification

Classification of the substance or mixture

Acute toxicity - Category 4, Oral

GHS label elements, including precautionary statements

Precautionary statement(s)
Pictogram(s)
Signal word	Warning
Hazard statement(s)	H302 Harmful if swallowed
Prevention	P264 Wash ... thoroughly after handling. P270 Do not eat, drink or smoke when using this product.
Response	P301+P317 IF SWALLOWED: Get medical help. P330 Rinse mouth.
Storage	none
Disposal	P501 Dispose of contents/container to an appropriate treatment and disposal facility in accordance with applicable laws and regulations, and product characteristics at time of disposal.

Other hazards which do not result in classification

no data available

Handling and Storage

Precautions for safe handling

Handling in a well ventilated place. Wear suitable protective clothing. Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Use non-sparking tools. Prevent fire caused by electrostatic discharge steam.

Conditions for safe storage, including any incompatibilities

Keep container tightly closed in a dry and well-ventilated place. Store under inert gas. Air sensitive. Storage class (TRGS 510): Non Combustible Solids.

See More L-(+)-Cysteine Safety Data Sheet 

Seller Information

Business Type:
Manufactory

Main Products:
Calcium polystyrene sulfonate,Megestrol Acetate,Eperisone Hydrochloride

Location:
room610,xueshi road

Payment Terms:
TT against copy of documents

Average lead Time:
15

Total Annual Revenue:
$5 million-$10 million

Total Employees:
11-50

Year of Establishment:
2020

zhengjiang langbo pharma is a leading Manufactory supplier of Acetic acid, Benzyl alcohol, PE based in Ningbo, Zhejiang, China. With a commitment to quality and customer satisfaction, zhengjiang langbo pharma has become a trusted name in the industry. Our product line includes a range of high-quality Acetic acid, Benzyl alcohol, PE, which are available at competitive prices. zhengjiang langbo pharma has established itself as a reliable supplier of chemical products on the echemi.com.

Inquiry History

44 Inquiries

Country	Product	Purchase Quantity	Date Posted
India	L-cysteine	5.00 KG	Dec 2, 2025
India	L-Cysteine	100.00 KG	Jun 7, 2025
India	L-Cysteine	1.00 KG	Nov 25, 2025
India	L-Cysteine	1.00 KG	May 13, 2025
India	L-Cysteine	1.00 KG	Oct 8, 2024
India	L Cyteine	25.00 KG	May 21, 2026
India	L-Cysteine	100 KG	Dec 17, 2025
India	L-Cysteine	1.00 MT	Sep 26, 2023
India	L-Cysteine	20.00 MT	Dec 13, 2023
India	L-Cysteine	1.00 KG	Jan 28, 2026
India	L-Cysteine	2.00 KG	Jan 27, 2026
Slovenia	L-CYSTEINE	400 KG	Jan 20, 2026
Egypt	L-Cysteine	1000 KG	Jan 19, 2026
India	L-Cysteine	1.00 KG	Sep 8, 2025
Pakistan	L-Cysteine	50.00 KG	May 6, 2025
India	L-Cysteine	1 MT	Apr 23, 2025
India	L-Cystiene	10.00 KG	Mar 26, 2025
India	L-Cysteine	1.00 KG	Nov 14, 2024
India	L-Cysteine	1.00 KG	Oct 28, 2024
India	L-Cysteine	10 KG	Jun 11, 2024

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L-Cysteine 52-90-4

Product Description

Seller Information