Food Yellow 4
Name:C.I.Food Yellow 4,C.I.19140
Molecular Structure: Single azo class
C.I.Food Yellow 4,C.I.19140,CAS 1934-21-0,C16H9N4Na3O9S2,534.37
Molecular Formula:C16H9N4Na3O9S2
Molecular Weight: 534.37
CAS Registry Number:1934-21-0
Manufacturing Methods : (a) 4-Aminobenzenesulfonic acid
diazo, and 5-Oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazole-3-carboxylic acid coupled; (b), 4-Hydrazinobenzenesulfonic acid (2 Moore) and Oxalacetic acid reaction.
Properties and Applications: yellow. Orange yellow powder. Soluble in water for yellow. Slightly soluble better ethanol and soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid for yellow, yellow solution diluted; In nitric acid also for yellow solution. The dye solution to join strong hydrochloric acid colour and lustre is unchanged; Add thick sodium hydroxide solution for red light yellow. LD50 (rat through the mouth) : > 2000 mg/kg, ADI: 7.5 mg/kg. And C.I.Acid Yellow 23 and the same chemical structure.
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