p-Aminobenzoic acid
Synonyms
4-Aminobenzoic acid;
PABA;
Category
Zwitterionic Surfactant
> Amino Acid Type
>> Amino acid and its Salts
Chemical Numbering System
CAS: 150-13-0
EINECS: 205-753-0
Molecular Formula & Molecular Weight
Molecular Formula: C7H7NO2; C7H7N1O2
Molecular Weight: 137.14
Structure
Properties
Appearance (1), white solid.
Solubility soluble in water.
Physical - chemical properties
|
Water solubility, g/L |
5.39 (25°C)[1] |
Stability stable.
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
|
dog oral LD50 |
1000mg/kg[2] |
|
mouse oral LD50 |
2850mg/kg[2] |
|
rabbit intravenous LD50 |
2000mg/kg[2] |
|
rabbit oral LD50 |
1830mg/kg[2] |
|
rat intraperitoneal LD50 |
> 3450mg/kg[2] |
|
rat oral LD50 |
> 6000mg/kg[2] |
Reproductive effect[2]. Overall carcinogenic evaluation: Group 3[2].
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent antistatic, dispersing, UV absorbing abilities. Absorb UVB band.
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 dispersing agent, emulsion stabilizer.
Use as UV absorbing agent.
2, Organic synthesis
Use as intermediate in organic synthesis.
Manufacturers
References
[1]: HSDB. 150-13-0, 4-Aminobenzoic acid
[2]: ChemIDplus. 150-13-0, 4-Aminobenzoic acid
Update: 20190414(1);