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Cysteine hydrochloride

CAS Number
52-89-1
EC Number
200-157-7
Chemical Formula
C3H7NO2S.ClH
Molecular Weight
157.62 g/mol

Description

Cysteine hydrochloride ( CAS 52-89-1 ), also supplied as L-Cysteine monohydrochloride, is the stabilized salt form of the amino acid L-cysteine. It offers improved solubility and shelf stability over the free base form. It functions as a dough conditioner, antioxidant, and reducing agent across food, pharmaceutical, and personal care manufacturing. In commercial baking, it reduces mixing time and improves dough extensibility. By cleaving disulfide bonds in gluten networks, it enhances the texture of bread, crackers, and pizza bases. Pharmaceutical manufacturers use it as a stabilizing excipient in injectable formulations. It also serves as a precursor in the synthesis of N-acetylcysteine and other sulfur-containing actives. In personal care, it is the active ingredient in professional hair-straightening treatments. Controlled reduction of keratin disulfide bonds reshapes hair structure effectively. Food and beverage producers also incorporate it as an antioxidant to prevent browning in fruit-based products. Cysteine hydrochloride is available as a white crystalline powder in both monohydrate and anhydrous forms. Standard grades include USP , BP , Ph. Eur. , and EP specifications. Food-grade variants meeting FCC requirements are also available for global distribution. Bulk supply is typically offered in 25 kg bags for industrial use and large scale production. Smaller packaging options are available for pharmaceutical and specialty applications. This versatile chemical ensures consistency and performance across a wide range of technical manufacturing processes. Contact us for supply of Cysteine hydrochloride Request Quote

Other Names (Synonyms)

L-cysteinium chloride | L-Cysteine monohydrochloride | L-(+)-Cysteine hydrochloride | Cysteine monohydrochloride | Cysteine hydrochloride (anhydrous) | Cysteine HCl (anhydrous) | (R)-Cysteine hydrochloride | Cystein chloride

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point179.3 °C
Appearancesolid
ColorWhite to light brown
Odorodorless
FormSolid
Water SolubilitySOLUBLE
Log P0.235 (est)

Safety & Handling

Warning
GHS07· Irritant

Hazard Statements

H302Harmful if swallowed
H319Causes serious eye irritation

Precautionary Statements

P264Wash … thoroughly after handling.
P270Do not eat, drink or smoke when using this product.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P330Rinse mouth.
P501Dispose of contents/container in accordance with local regulations.
P265Wash … thoroughly after handling.
P317Get emergency medical help.
P317If eye irritation persists: Get medical advice/attention. Get emergency medical help.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code29309099
Storage Class11 - Combustible Solids
WGK (Germany)2