1,2-Dithiolane-3-pentanoic acid, (S)-
Synonyms
Thioctic acid l-form;
(-)-Thioctic acid;
(S)-(-)-Lipoic acid;
(S)-Lipoic acid;
(S)-Thioctic acid;
S-(-)-alpha-Lipoic acid;
L-Thioctic acid;
Category
Anionic Surfactant
> Carboxylate
>> Chain Carboxylate
>>> Sulphurheterocyclic Alkyl Carboxylate
>>>> Dithiolan Linear Alkylcarboxylate
Chemical Numbering System
CAS: 1077-27-6
EINECS: N/A
Molecular Formula & Molecular Weight
Molecular Formula: C8H14O2S2
Molecular Weight: 206.33
Structure
Properties
Appearance (1), white to pale yellow solid.
Solubility slightly soluble in water.
Stability stable. Easily oxidized.
Risk Solid form: flammable material; irritation, irritation to skin, eye, respiratory system. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.
GHS label: 
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent anti-oxidizing, dispersing abilities. Universal antioxidant. Vitamer.
Synthesis
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Solid |
|
|
Actives, %, ≥ |
95.0 |
Test Methods
(1), Actives
GB/T 13173 Surface active agents -- Detergents -- Testing methods
GB/T 5173 Surface active agents and detergents -- Determination of anionic-active matter by direct two-phase titration procedure
ISO 2271 Surface active agents -- Detergents -- Determination of anionic-active matter by manual or mechanical direct two-phase titration procedure
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Solid |
|
|
Heavy metals (as Pb), mg/kg, ≤ |
20 |
|
As, mg/kg, ≤ |
3 |
Test Methods
(1), Heavy metals (as Pb)
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30799 The test method of food detergents -- Determination of heavy metals
(2), As
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30797 The test method of food detergents -- Determination of total arsenic
3, Further explanation
(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.
Major Uses
1, Typical applications
Use as antioxidant.
Use as chelating agent.
Manufacturers
Update: 20140203(1); 20180925(2);