CARMINIC ACID

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| Other names
| Carminic acid
C.I. Natural Red 4
C.I. 75470
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'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 anthroquinone structure linked to a glucose sugar unit. Carminic acid was first synthesized by organic chemists in 1991.^[2]

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References

1. ''Merck Index'', 11th Edition, '1850'.
2. 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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