L-Cysteine Manufacturer
49 Inquiries
52-90-4
Pharmaceutical Grade
99%
shenzhen
Fying
10g/1kg/ 10kg/ 25kg
2026-09-20
vitamin
-
Product Description
-
Seller Information
-
Inquiry History
-
DescriptionECHEMI Editorial ReferenceL-Cysteine is a thiol-containing non-essential amino acid that is oxidized to form cystine.
DryPowder|Solid|White crystals; Sulferous aroma
L-cysteine is an optically active form of cysteine having L-configuration. It has a role as a flour treatment agent, a human metabolite and an EC 4.3.1.3 (histidine ammonia-lyase) inhibitor. It is a serine family amino acid, a proteinogenic amino acid, a cysteine and a L-alpha-amino acid. It is a conjugate base of a L-cysteinium. It is a conjugate acid of a L-cysteinate(1-). It is an enantiomer of a D-cysteine. It is a tautomer of a L-cysteine zwitterion.|A thiol-containing non-essential amino acid that is oxidized to form cystine.|Acetylcysteine, also known as N-acetylcysteine (NAC), is a modified amino acid that is used as an antidote for acetaminophen overdose to prevent hepatic injury. Acetylcysteine is a hepatoprotective agent and has not been linked to significant serum enzyme elevations during therapy or to instances of clinically apparent acute liver injury.|Cysteine is a non-essential sulfur-containing amino acid in humans, related to cystine, Cysteine is important for protein synthesis, detoxification, and diverse metabolic functions. Found in beta-keratin, the main protein in nails, skin, and hair, Cysteine is important in collagen production, as well as skin elasticity and texture. Also required in the manufacture of amino acid taurine, Cysteine is a component of the antioxidant glutathione, and plays a role in the metabolism of essential biochemicals such as coenzyme A, heparin, and biotin. (NCI04)|A thiol-containing non-essential amino acid that is oxidized to form CYSTINE.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:
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 Ų [M+H]+ [CCS Type: DT, Method: stepped-field]|151.34 Ų [M+Na]+ [CCS Type: DT, Method: stepped-field]|144.47 Ų [M-H]- [CCS Type: DT, Method: stepped-field]|113 Ų [M+H]+ [CCS Type: TW, Method: calibrated with polyalanine]|144 Ų [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)
Hazard IdentificationClassification of the substance or mixture
Acute toxicity - Category 4, Oral
GHS label elements, including precautionary statements
Pictogram(s) 
Signal word Warning
Hazard statement(s) H302 Harmful if swallowed
Precautionary statement(s) 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 StoragePrecautions 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.
-
-
Seller Information
-
Business Type:
Trader
-
Main Products:
vitamin
-
Location:
Room 2-502, Building 6, Luneng Tehran Garden Building, No.8 Changbin Road, Xiuying district, Haikou City, Hainan Province
-
Payment Terms:
TT against copy of documents,TT against B/L draft before shipment
-
Average lead Time:
25
-
Total Annual Revenue:
$2.5 million-$5 million
-
Total Employees:
Less than 5
-
Year of Establishment:
2023
-
-
Inquiry History49 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 Jul 14, 2026
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
25.00 KG Jul 30, 2026
India
L-Cysteine
100 KG Jul 29, 2026 
Egypt
L-Cysteine
1.00 KG Jul 25, 2026
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 Post an enquiry for this product
