Name | new red |
Synonyms | new red trisodium salt of 2-(4-sulfo-1-phenylazo)-1-naphthol-8-acetylamino-3,6-disulfonic acid |
Molecular Formula | C18H12N3Na3O11S |
Physical and Chemical Properties | Chemical property red powder, aqueous solution is red. Soluble in water, slightly soluble in ethanol, insoluble in grease. The maximum absorption wavelength is 515nm-+-10nm. The oral LD5010g/kg of mice and the MNL of mice were 0.5%. The new red aluminum lake is a red powder and odorless. Light resistance and heat resistance are better than those of Xinhong, and are insoluble in water and organic. Solvents. Toxicity reference new red. |
Use | Uses as food colorants, China's provisions can be used for red and green silk, dyed cherry canned (Department of decorative), the maximum use of 0.10g/kg; In a variety of beverages, wine, candy, in the color clothes and plum on the cake, the maximum usage amount was 0.05g/kg. |
(1) preparation of new red. In the realkaline medium, it is obtained by the coupling of acetyl H acid and the diazo compound of p-aminobenzenesulfonic acid.
(2) Preparation of New Red Aluminum Lake. Aluminum hydroxide is prepared from aluminum salts such as aluminum chloride, aluminum sulfate and alkali such as sodium carbonate, and added to the new red aqueous solution to precipitate the product.
Preparation of new red
It is obtained by coupling acetyl H acid with diazo compounds of p-aminobenzenesulfonic acid in alkaline medium. Preparation of New Red Aluminum Lake
Aluminum hydroxide is prepared from aluminum salt such as aluminum chloride, aluminum sulfate, etc. and alkali such as sodium carbonate, and a new red aqueous solution is added to precipitate the product.