Rosolic acid/Aurine；Corallin/p-Rosolic acid/Pararosolic acid

English Name: rosolic acid; Aurine； Corallin； p-Rosolic acid； Pararosolic acid

Other names: rose red acid; Resinous acid; Rhodochromic acid; Golden red; Rosacic acid; Melatonic acid

CAS No.: 603-45-2

C19H14O3=290.32

Grade: ind

PH discoloration range: 6.8 (yellow) ～ 8.0 (red)

Sensitivity test: acceptable

Ethanol dissolution test: qualified

Burning residue (calculated by sulfate): ≤ 0.2%

Physicochemical Properties: dark red crystal, metallic luster. There are also yellow brown pieces with dark green metal. It is easily soluble in ethanol in golden yellow solution, soluble in sodium hydroxide or potassium hydroxide in water or ethanol solution in carmine, soluble in concentrated sulfuric acid, 70% sulfuric acid, hydrochloric acid or perchloric acid in yellow to orange, slightly soluble in glacial acetic acid, slightly soluble in ether and chloroform, almost insoluble in water (0.12%) and benzene. It will not volatilize when heated to 180 ℃ in vacuum. The maximum absorption wavelength (potassium hydroxide solution) is 534.6, 479.5nm. Irritating. Melting point 308-310 ℃ (simultaneous decomposition)

Purpose: biochemical research. Acid base indicator. Qualitative reagent for carbon dioxide in drinking water. It can also be used to distinguish human milk from cow's milk. Dye intermediate

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