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Basic information
- CAS
52-89-1- Standard SMILES
Cl.N[C@@H](CS)C(=O)O- InChIKey
IFQSXNOEEPCSLW-DKWTVANSSA-N- Molecular formula
- C3H7NO2S.ClH
- Average molar mass
- 157.62 g/mol
- Monoisotopic mass
- 156.99642718
Overview
L-cysteine hydrochloride is a hydrochloride obtained by combining L-cysteine with one molar equivalent of hydrogen chloride. It has a role as a flour treatment agent, an EC 4.3.1.3 (histidine ammonia-lyase) inhibitor and a human metabolite. It contains a L-cysteinium.
Names & identifiers
- Preferred name
- Cysteine Hydrochloride
- IUPAC
- (2R)-2-amino-3-sulfanylpropanoic acid;hydrochloride
Names & synonyms
Cystein chlorideCYSTEINE HYDROCHLORIDECysteine chlorhydratecysteine-hcl3-Mercaptoalanine hydrochlorideCysteine hydrochloride (anhydrous)CCRIS 3613Cysteine hydrochloride anhydrousNSC 8746EINECS 200-157-7WR 348UNII-A9U1687S1S
Show more names
EK 2367AI3-18781A9U1687S1SCysteine (as hydrochloride)CYSTEINE HYDROCHLORIDE, ANHYDROUSEC 200-157-7ELCYSNOURESS
Database identifiers
- CAS
52-89-1- PubChem CID
- 60960
- DTXSID
DTXSID0020367- ChEMBL
CHEMBL1200630- ChEBI
CHEBI:91247- UNII
- A9U1687S1S
- EC Number
- 200-157-7
Properties
Computed structural propertiesFilling in
- Topological polar surface area
- 64.3 Ų
- Hydrogen bond donors
- 4
- Hydrogen bond acceptors
- 4
- Rotatable bonds
- 2
- Heavy atoms
- 8
- Formal charge
- 0
- Complexity
- 75.3
Experimental & physicochemical properties
Chemical Classes
Biological Agents -> Amino Acids and Derivatives
Biological Agents -> Amino Acids and Derivatives
Cosmetics
Cosmetic ingredients (Cysteine HCl) -> CIR (Cosmetic Ingredient Review)
Antioxidant; Reducing
Food AdditivesDOUGH STRENGTHENER, FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT, FLOUR TREATING AGENT, LEAVENING AGENT, NUTRIENT SUPPLEMENT -> FDA Substance added to food
Flavoring AgentsEU Flavoring substances
Human Drugs
FDA approved drugs -> Active ingredient
FDA approved drugs -> Active ingredient
Physical Description
Dry Powder
Solid; [Sigma-Aldrich MSDS]
Hygroscopic solid; [Merck Index] White powder with an irritating odor; Hygroscopic; [Alfa Aesar MSDS]
Safety & regulation
GHS classification
GHS Classification
This chemical does not meet GHS hazard criteria for 8.7% (146 of 1677) of reports.
Warning
H319 (89.8%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
P264+P265, P280, P305+P351+P338, and P337+P317 (click each P-code to see the statement)
Aggregated GHS information provided per 1677 reports by companies from 23 notifications to the ECHA C&L Inventory.
Warning
Hazard information
Regulatory Information
Chemical: L-Cysteine, hydrochloride
Commission Regulation (EC) No 1565/2000 (Repealed by Com. Implementing Reg. (EU) No 872/2012)
L-Cysteine, hydrochloride (1:1) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of L-Cysteine, hydrochloride (1:1) are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)
Status: Active Update: 07-12-2022 https://echa.europa.eu/registration-dossier/-/registered-dossier/5517
L-Cysteine, hydrochloride: Does not have an individual approval but may be used under an appropriate group standard
Other Safety InformationIMAP assessments - L-Cysteine, hydrochloride: Environment tier I assessment
Hazards Summary
A skin and strong eye irritant; [Sigma-Aldrich MSDS]
Causes other changes of the liver, kidney, and bladder and effects on lipids in 12-week oral studies of rats; [RTECS] A skin and strong eye irritant; [Alfa Aesar MSDS] See Cysteine.
Hazard Classes and Categories
Eye Irrit. 2 (89.8%)
Acute toxicity (ingestion) - category 4
Toxicology
Toxicity SummarySafe in the present practices of use and concentration. Ingredient, concentration, and use information are available in documents discoverable at https://cir-reports.cir-safety.org
Chemistry & industry
Uses & manufacturing
Uses
CIR ingredient: Cysteine HCl
Cysteine is a non-essential amino acid that has been used as a dough conditioner and veterinary detoxicant; [Merck Index]
Cysteine is a non-essential amino acid that has been used as a dough conditioner and veterinary detoxicant; [Merck Index] Used as a flavoring agent, dough strengthener, nutritional supplement, flour treating agent, and leavening agent for foods; [FDA]
U.S. Production2023: 100,000 - <250,000 lb
Consumer UsesFragrance
Industry UsesNot Known or Reasonably Ascertainable
Household ProductsInformation on 1 consumer products that contain Cysteine Hcl in the following categories is provided:
Use ClassificationCosmetics -> Antioxidant; Reducing
General Manufacturing Information
Food, beverage, and tobacco product manufacturing
L-Cysteine, hydrochloride (1:1): ACTIVE
Related reactions
78 records
Compound notes
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