CAS 52-90-4 L-Cysteine/Bulk L Cysteine Powder
ISO 52 Inquiries
52-90-4
0%
100g;1kg;25g
2022-12-31
Agrochemicals,Daily Chemicals,Catalysts & Chemical Auxiliary Agents,Extract,Inorganic Chemicals,Organic Intermediate
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Product Description
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Seller Information
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Inquiry History
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Description
Melting point 240 °C (dec.) (lit.) alpha 8.75 º (c=12, 2N HCl) Boiling point 293.9±35.0 °C(Predicted) density 1.197 (estimate) FEMA 3263 | L-CYSTEINE refractive index 8.8 ° (C=8, 1mol/L HCl) storage temp. Store below +30°C. solubility H2O: 25 mg/mL pka 1.92(at 25ºC) form Solid color White PH 4.5-5.5 (100g/l, H2O, 20ºC) optical activity Optical rotation: +8° to +9° (c = 5, 1 N HCl, 20°C). 
Packing
· 1kg/aluminium foil bag, with two plastic bags inside.
· 25kg/fiber drum, with two plastic bags inside.
Size:ID 42cm*H52cm,0.08m3/drum;
Net Weight:25kgs Gross Weight:28kgs.
Delivery- ≤50kg, Express delivery recommended, usually called as DDU service;
- ≤500kg,Air shipping recommended, usually called as CIF service;
- >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;
- For high value products, please select air shipping and express delivery for safety.
SHANDONG LOOK CHEMICAL CO.LTD, a new chemical enterprise in researching, manufacturing and supplying of chemicals located in beautiful "Spring City"-Jinan.Our company mainly working on the researching new-born APIs, intermediate ( especially Carbohydrate derivatives series). Meanwhile, we made huge breakthrough in industries of food, feed additives, cosmetics ,dye and industrial chemicals. Our company enjoyed great reputation both domestic and abroad under the belief of "Integrity management,Quality controlling and Customer orientation".
We had been cooperated with NingXia University and Shandong University on more than ten projects for years and which had been in mass production on the market. We now have more than 80 people in our team and built research center in Jinan and Ningxia. Our manufacturing site allocated in chemical industry parks of Zhangqiu, Heze, Dezhou and Ningxia Fine Chemical Park. We strictly complying with ISO9001 and ISO 2000 standard in manufacturing process, our lab and workshop tightly in accordance with GMP standard.Our products best selling in Europe, South and North America,Asia pacific area and Africa. We sincerely welcome new and regular customers around the world visit us for business negotiation.
FAQ- DO YOU ACCEPT SAMPLE ORDER?
We accept sample orders. We will make samples before mass production, and after sample approved, we'll begin mass production. Doing 100% inspection during production, then do random inspection before packing.
2.HOW TO CONFIRM THE PRODUCT QUALITY BEFORE PLACING ORDERS?
You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.
3.WHAT'S YOUR MOQ?
Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.
4.DO YOU SUPPLY PRODUCT REPORT?
Yes. We'll give you product analysis report before shipping.
5.IS THERE A DISCOUNT?
Different quantity has different discount.
Our Advantage
10 Years Experience
Our products are sold all over Europe,North&South America, Sino-East, Asia and pacific area as well as Africa,we establish long term.
Quality service
Company cooperates with research institutes. We strictly control the process of raw materials up to finished product.
24 hour serviceQuick and clear response to customers questions. Warm after sale service, we will help to solve the problems in your usage.
High quality
Dedicated to serving customers first, we provide reasonable prices, high quality products.ECHEMI 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.CertificatesBasic 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.
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Seller Information
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Business Type:
Manufactory
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Main Products:
Agrochemicals,Daily Chemicals,Catalysts & Chemical Auxiliary Agents,Extract,Inorganic Chemicals,Organic Intermediate
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Location:
hisense intelligence valley,no 2116,of phoenix road
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Payment Terms:
TT against copy of documents,D/P,L/C
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Average lead Time:
7
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Total Annual Revenue:
Less than $1 million
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Total Employees:
11-50
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Year of Establishment:
2017
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Inquiry History52 Inquiries
Country Product Purchase Quantity Date Posted 
India
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5.00 KG Dec 2, 2025
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100.00 KG Jun 7, 2025
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1.00 KG Jul 14, 2026
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1.00 KG Nov 25, 2025
India
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1.00 KG May 13, 2025
India
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1.00 KG Oct 8, 2024
India
L Cyteine
25.00 KG May 21, 2026
India
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100 KG Dec 17, 2025
India
L - CYSTINE
25.00 KG Aug 26, 2026
India
L-Cysteine
1.00 MT Sep 26, 2023
India
L-Cysteine
25 KG Aug 26, 2026
India
L-Cysteine
20.00 MT Dec 13, 2023
India
L-Cysteine
300.00 KG Sep 4, 2026 
Egypt
L-Cysteine
1.00 KG Jul 25, 2026
India
L-Cysteine
500 G May 22, 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 
Pakistan
L-Cysteine
50.00 KG May 6, 2025 Post an enquiry for this product
