Benzoic acid, 2,5-dihydroxy-, monosodium salt
Synonyms
Benzoic acid, 2,5-dihydroxy-, sodium salt (1:1);
Gentisic acid, monosodium salt;
Sodium 2,5-dihydroxybenzoate;
Sodium gentisate;
Category
Anionic Surfactant
> Carboxylate
>> Cyclic Carboxylate
>>> Aryl Carboxylate
>>>> Hydroxybenzoate
Chemical Numbering System
CAS: 4955-90-2
EINECS: 225-598-2
Molecular Formula & Molecular Weight
Molecular Formula: C7H5NaO4; C7H6O4.Na
Molecular Weight: 176.10
Structure
Properties
Appearance (1), yellow-white powder.
Solubility 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: 
Animal Toxicity
Table 1 Animal toxicity values
|
mouse subcutaneous LD50 |
3900mg/kg[1] |
|
mouse intraperitoneal LD50 |
3735mg/kg[1] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent anti-oxidizing, dispersing abilities.
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
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.
Manufacturers
References
[1]: ChemIDplus. 4955-90-2, Sodium gentisate
Update: 20140309(1); 20181118(2);