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Superior Quality L-Cysteine Hydrochloride Monohydrate for Health and Nutrition

Name: Superior Quality L-Cysteine Hydrochloride Monohydrate for Health and Nutrition
Brand: guozhao
SKU: pr2608283839
Price: 4.5 USD
Availability: InStock

47 Inquiries

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CAS No.:

52-90-4

Grade:

Industrial Grade

Content:

99%

Port:

qingdao

Brand:

guozhao

Packaging:

25kg

Price valid (until):

2026-09-28

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Shandong Guozhao Import and Export Co., Ltd.

Company Type:

Distributor

Location:

China

Qualification:

Main Products:

CHEMICALS

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Product Description
Seller Information
Inquiry History

Description

Product Detail

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We are a professional foreign trade company focusing on the export of full-range non-hazardous chemical raw materials.

We specialize in general cargo chemicals only, covering basic chemicals, fine chemicals, industrial additives, water treatment materials, daily chemical raw materials and white powder chemical materials.

We do not deal with dangerous goods, flammable, corrosive or restricted chemicals. All products are safe general cargo for sea shipment, with stable customs clearance and flexible FCL bulk supply.

Our main product portfolio includes: surfactant series, inorganic salts, water treatment chemicals, plant consumables, detergent raw materials, industrial fillers and cosmetic raw materials.

We provide complete official documents (COA, MSDS, TDS) for every shipment, support customized specifications and long-term monthly repeat orders.

With rich experience in chemical export supply chain, we serve global clients including gas factories, epoxy chemical plants, detergent manufacturers, water-treatment companies and chemical traders across Southeast Asia, Korea, India, Middle East and Australia.

We insist on stable quality, competitive price and on-time delivery, aiming to provide reliable and professional Chinese chemical sourcing solutions for global buyers.

ECHEMI Editorial Reference

L-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:

Film-Forming Material

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:
Distributor

Main Products:
CHEMICALS

Location:
No. 109, Chailu Street, Qingnian Park Subdistrict, Huaian District, Jinan City, Shandong Province 280

Year of Establishment:
2026

Shandong Guozhao Import and Export Co., Ltd., located at No. 280, Chalu Street, Qingnian Park Subdistrict, Huaiyin District, Jinan City, Shandong Province, primarily engages in import and export of goods; sales of chemical products (excluding licensed chemical products); sales of specialty chemical products (excluding hazardous chemicals); sales of plastic products; sales of metal products; sales of building materials; sales of architectural decoration materials; sales of daily-use chemical products; sales of food additives; sales of feed additives; sales of fertilizers; sales of batteries; and general cargo warehousing services (excluding items requiring licensing or approval, such as hazardous chemicals).

Inquiry History

47 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 - CYSTINE	25.00 KG	Aug 26, 2026
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
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

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Superior Quality L-Cysteine Hydrochloride Monohydrate for Health and Nutrition

Product Description

Seller Information

Inquiry History

Classification of the substance or mixture

GHS label elements, including precautionary statements

Other hazards which do not result in classification

Precautions for safe handling

Conditions for safe storage, including any incompatibilities

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