Cysteine
CAS 52-90-4
EC 200-158-2
Formula C3H7NO2S
MW 121.16 g/mol
Amino Acids & Peptides Personal Care & CosmeticsFood & NutritionPharmaceuticals & Healthcare Humectant & MoisturizingAntioxidant & StabilizerSurface Modification & Wetting
Description
Cysteine (CAS 52-90-4) is a sulphur-containing amino acid supplied as a white crystalline powder, commonly identified by the abbreviations CYS and CYSH, the systematic shorthand H-Cys-OH, and the food additive designation E920. It occurs naturally in proteins and is produced commercially via fermentation or extraction.
In baked goods, cysteine functions as a dough conditioner by cleaving disulphide bonds in gluten networks, reducing mixing time and improving extensibility. In personal care formulations, its free thiol group acts as a reducing agent in hair-waving systems and contributes antioxidant and humectant activity in skin-conditioning products.
Cysteine is available in food-grade (E920, FCC), pharmaceutical-grade (Ph.Eur.), and cosmetic-grade specifications. It is REACH-registered under HS code 29309012 and supplied in standard 25 kg bags or fibre drums. Buyers should confirm grade suitability against application-specific regulatory requirements prior to procurement.
In baked goods, cysteine functions as a dough conditioner by cleaving disulphide bonds in gluten networks, reducing mixing time and improving extensibility. In personal care formulations, its free thiol group acts as a reducing agent in hair-waving systems and contributes antioxidant and humectant activity in skin-conditioning products.
Cysteine is available in food-grade (E920, FCC), pharmaceutical-grade (Ph.Eur.), and cosmetic-grade specifications. It is REACH-registered under HS code 29309012 and supplied in standard 25 kg bags or fibre drums. Buyers should confirm grade suitability against application-specific regulatory requirements prior to procurement.
Physical Properties
| Melting Point | 240 °C (decomp) |
| Boiling Point | 293.9±35.0 °C(Predicted) |
| Density | 1.6666 g/cm³ @ Temp: 45.00 °C |
| Appearance | White crystalline powder |
| Color | White |
| Odor | sulfury |
| Form | Solid |
| Water Solubility | 280 g/L (25 ºC) |
| Refractive Index | 8.8 ° (C=8, 1mol/L HCl) |
| pH | 4.5-5.5 (100g/l, H2O, 20℃) |
| Log P | -2.49 |
Safety & Handling (Learn More)
Warning GHS07
H
H302H315H319H335
P
P261P264P270P271P280P319P321P330P405P501P264+P265P301+P317P302+P352P304+P340P332+P317P337+P317P362+P364P403+P233P305+P351+P338
Trade & Regulatory
| HS Code | 29309012 |
| Storage Class | 11 - Combustible Solids |
| WGK (Germany) | 3 |
Other Names
L-(+)-Cysteine(2R)-2-amino-3-sulfanylpropanoic acidCysE920CYSHCysteinH-CYS-OH
Related Products
Raw Materials
Derivatives
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