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Carminic acid
| Carminic acid[1] |
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| IUPAC name |
7-α-D-Glucopyranosyl-9,10-dihydro-
3,5,6,8-tetrahydroxy-1-methyl-9,10-
dioxoanthracenecarboxylic acid |
| Other names |
Carminic acid
C.I. Natural Red 4
C.I. 75470 |
| Identifiers |
| CAS number |
1260-17-9 |
| SMILES |
Cc1c(C(O)=O)c(O)cc2C(=O)c3c(O)c
(O)c([C@H]4O[C@H](CO)[C@@H](O)
[C@H](O)[C@H]4O)c(O)c3C(=O)c12 |
| Properties |
| Molecular formula |
C22H20O13 |
| Molar mass |
492.38 g/mol |
| Density |
? g/cm3 |
| Melting point |
120 °C (decomp.)
|
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references |
Carminic acid (C22H20O13) is a red glucosidal hydroxyanthapurin that occurs naturally in some scale insects, such as the cochineal and the Polish cochineal. The insects produce the acid as a feeding deterrent. Carminic acid is the colouring agent in carmine. Synonyms are C.I. 75470 and C.I. Natural Red 4.
The chemical structure of carminic acid consists of a core anthraquinone structure linked to a glucose sugar unit. Carminic acid was first synthesized by organic chemists in 1991.[2]
References
- ^ Merck Index, 11th Edition, 1850.
- ^ Allevi, P. et al. 1991. The 1st Total Synthesis of Carminic Acid. Journal of the Chemical Society-Chemical Communications 18:1319-1320.
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Carminic_acid". A list of authors is available in Wikipedia.
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