Carminic acid
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| Carminic acid[1] | |
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| Chemical 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 |
| Chemical formula | C22H20O13 |
| Molecular mass | 492.38 g/mol |
| CAS number | [1260-17-9] |
| Density | ? g/cm3 |
| Melting point | 120 °C (decomp.) |
| SMILES | O=C1C4=C(C(C)=C(C(O)=O)C(O)=C4) C(C2=C1C(O)=C(O)[C@@]([C@@H]3[C@H](O) [C@@H](O)[C@H](O)[C@@H](CO)O3)=C2O)=O |
| Disclaimer and references | |
Carminic acid (C22H20O13) is a red glucosidal hydroxyanthapurin that occurs naturally in the cochineal insect. The insect produces 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 anthroquinone structure linked to a glucose sugar unit. Carminic acid was first synthesized by organic chemists in 1991.[2]
[edit] 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.
