P-aminobenzoic acid / 4-aminobenzoic acid / p-acid / PABA

English name: PABA; p-Aminobenzoic acid; 4-Aminobenzoic acid; Vitamin Bx; Vitamin H1

Other names: 4-aminobenzoic acid; p-acid
CAS number: 150-13-0
C7H7NO2 = 137.14

Level: AR

Content: ≥99.5%

Sulfate: ≤0.01%

Chloride: ≤0.01%

Melting point: 186.5 ～ 188.5 ℃

Sodium carbonate dissolution test: qualified

Iron: ≤0.002%

Heavy metals: ≤0.001%

Residue on ignition: ≤0.03%

Application: It is one of chemical raw materials, used in pharmaceutical intermediate and agricultural intermediate.

Properties: white monoclinic prism crystal. Light yellow in exposed air and light. Soluble in boiling water, soluble in alcohol, ether, ethyl acetate and glacial acetic acid, slightly soluble in water and benzene, insoluble in petroleum ether. 

The pH value of the 0.5% solution is 3.5. The lethal dose (mice, oral) was 2850 mg / kg. Irritating. 

Solubility: 4.7 g / L water (20 ° C), 121 g / L ethanol, 1g / 50ml ether. Relative density: 1.374. It is one of the constituents of folic acid, a substance necessary for the growth and division of cells in the body. It is very high in yeast, liver, bran and malt. 

Uses: biochemical research. Used as a reagent for the determination of copper. Used for synthesis and storage of esters, folic acid and azo dyes: RT, protected from light