Germany
BuGuCh & Partners
Alizarin red S, C.I. 58005
Synonyms:DIAMOND RED W;CI 58005;CI NO 58005;LABOTEST-BB LT00159822; 3,4-DIHYDROXY-2-ANTHRAQUINONESULFONIC ACID, SODIUM SALT; 3,4-DIHYDROXY-9,10-DIOXO-2-ANTHRACENESULFONIC ACID, SODIUM SALT; 9,10-DIHYDRO-3,4-DIHYDROXY-9,10-DIOXO-2-ANTHRACENESULFONIC ACID, SODIUM SALT; ALIZARIN SULFONIC ACID SODIUM SALT
CAS:130-22-3
Molecular formula:C14H7NaO7S
Molecular Weight:342.26
Merck:14,8573
BRN:4117090
Stability:Stable. Incompatible with strong oxidizing agents.
Chemical properties: orange yellow or yellow brown powder. Soluble in water, slightly soluble in ethanol, insoluble in benzene and chloroform. 1% aqueous solution pH 2.15, the aqueous solution was light brown, add hydrochloric acid into a yellow, add sodium hydroxide, then become blue-violet. Irritant
Usage:
1. Commonly used in woolen, worsted, carpets, blankets are used to fight color
2. Biochemical research
3. Determination of fluoride. Acid-base indicator, pH3.7 (yellow) -5.2 (violet). With many metal ions to generate color compounds for zirconium, thorium, aluminum, titanium and beryllium color reaction and colorimetric determination. Microscopic staining agents, in vivo staining of nerve tissue, chromosome staining in plant cytology, and reagents for the detection of sagittaline.
4. Determination of fluoride; acid-base indicator, pH3.7 (yellow) ~ 5.2 (purple); with many metal ions to generate color compounds for zirconium, thorium, aluminum, titanium and beryllium color reaction and colorimetric Micro-staining agents, in vivo staining of nerve tissue, chromosome staining in plant cytology, and reagents for the determination of atropine
Brief manufacture process:
The alizarin added 15% fuming sulfuric acid, 105-110 ° C sulfonation, heat 3h, cooling, pouring into distilled water, 60 ° C sodium chloride precipitation, heated to 70 ° C, placed overnight, filtration. After washing with 10% sodium chloride solution, it was dissolved in steam
Distilled water, placed, filtered. The solution was soaked in ethanol and hydrochloric acid (9: 1). The crystals were stirred overnight, and the crystals were dried at 80 ° C or lower. Purification: alizarin red by water dissolved in hot water, coupled with activated carbon decolorization, filtration, while stirring the filtrate plus ammonia, until a small amount of crystalline precipitation, stirring 20min, placed overnight, filtration, the product at 70-80 ℃ dry.
