Chemical Properties
Orange or yellow powder. Insoluble in water; soluble in alcohol and
oils.
Definition
ChEBI: Yellow OB is a member of azobenzenes.
Preparation
O-Methylaniline diazotization, and Naphthalen-2-amine coupling.
Hazard
Consult regulations before using in food
products. Questionable carcinogen.
Safety Profile
A poison by ingestion.
Moderately toxic by intraperitoneal and
subcutaneous routes. Questionable
carcinogen with experimental tumorigenic
data. May be contaminated with the
carcinogen p-naphthylamine. Mutation data
reported. When heated to decomposition it
emits toxic fumes of NOx. See also AROMATIC AMINES.
Properties and Applications
red light yellow to orange (in mineral oil). Soluble in ethanol and Toluene, insoluble in water. In the crystallization of from ethanol to get is a deep red, melting point is 126 ℃. In concentrated sulfuric acid to red light purple, after diluted solution for red, orange brown precipitation. Dye alcohol solution to join hydrochloric acid solution more red; Sodium hydroxide and the same color.
|
Standard
|
Light Fastness
|
Heat-resistant(℃)
|
water
|
Sodium Carbonate(5%)
|
Hydrochloric acid(5%)
|
|
Melting point
|
Stable
|
|
ISO
|
Good
|
126
|
70
|
Insoluble
|
Well
|
Well
|
