CAS No 1260-17-9 , Carminic acid Search by region : Germany

Name: Carminic acid
Synonyms: E 120;2-Anthroicacid, 7-D-glucopyranosyl-9,10-dihydro-3,5,6,8-tetrahydroxy-1-methyl-9,10-dioxo-(7CI); Carmine 5297; NSC 326224; Carminic acid (6CI,8CI); Natural Red 4; E 120 (dye);Carminic acid; San Red 1;San-Ei Gen San Red 1; C.I. Natural Red 4; Sun Red No. 1; Sun Red 1;Cochineal Red PWD; C.I. 75470;
CAS Registry Number:1260-17-9
Melting Point: 136ºC
Density: 1.869 g/cm³
Refractive index: 1.792
Safety Statements: 22-24/25
EINECS: 215-023-3
Molecular Weight: 492.387
InChI: InChI=1/C22H20O13/c1-4-8-5(2-6(24)9(4)22(33)34)13(25)10-11(15(8)27)16(28)12(18(30)17(10)29)21-20(32)19(31)14(26)7(3-23)35-21/h2,7,14,19-21,23-24,26,28-32H,3H2,1H3,(H,33,34)/t7-,14-,19+,20-,21-/m1/s1
Molecular Formula: C22H20O13
Molecular Structure:

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1260-17-9 Carminic acid

Carminic acid
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1260-17-9 Carminic acid (natural dye)

Carminic acid (natural dye)
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References of Carminic acid

Title: Carminic Acid
CAS Registry Number: 1260-17-9
CAS Name: 7-a-D-Glucopyranosyl-9,10-dihydro-3,5,6,8-tetrahydroxy-1-methyl-9,10-dioxo-2-anthracenecarboxylic acid
Synonyms: C.I. Natural Red 4; C.I. 75470
Molecular Formula: C22H20O13
Molecular Weight: 492.39
Percent Composition: C 53.66%, H 4.09%, O 42.24%
Literature References: Glucosidal coloring matter from the scale insect Coccus cacti L., Homoptera (cochineal). The essential constituent of carmine. Isoln: Schunk, Marchlewski, Ber. 27, 2979 (1894); Dimroth, Scheuer, Ann. 399, 43 (1913). Structure: Dimroth, Kammerer, Ber. 53, 471 (1920); Ali, Haynes, J. Chem. Soc. 1959, 1033; revised structure: Bhatia, Venkataraman, Indian J. Chem. 3 (2), 92 (1965). See also Colour Index vol. 4 (3rd ed., 1971) p 4632.
Properties: Red prisms from alc, no distinct melting point, darkens at 120°. Has a deep red color in water and is yellow to violet in acid solns. uv max (water): 500 nm (e 6800); (0.02N HCl): 490-500 nm (e 5800); (0.0001N NaOH): 540 nm (e 3450). [a]15654 +51.6° (water). Sol in water, alc, concd H2SO4; slightly sol in ether. Practically insol in petr ether, benzene, chloroform.
Optical Rotation: [a]15654 +51.6° (water)
Absorption maximum: uv max (water): 500 nm (e 6800); (0.02N HCl): 490-500 nm (e 5800); (0.0001N NaOH): 540 nm (e 3450)

Derivative Type: Methyl tetra-O-methylcarminate
Molecular Formula: C27H30O13
Molecular Weight: 562.52
Percent Composition: C 57.65%, H 5.38%, O 36.98%
Properties: Yellow needles from benzene + petr ether, mp 185-188°.
Melting point: mp 185-188°

Derivative Type: Aluminum calcium lake
Synonyms: Carmine
Properties: Bright-red, light pieces; easily reduced to powder. Practically insol in cold water or dil acids. Partly sol in hot water; sol in solns of alkali hydroxides or their carbonates giving deep red solns; also sol in borax.

Use: Free acid in color photography; pigment for artists' paints; as bacteriol. stain; rarely now as acid-base indicator or as oxidimetric indicator; as a reagent for aluminum; as a complexing agent for cations. Aluminum calcium lake as dye; in inks; coloring foods, drugs and galenicals; in microscopy for making various stains.