Carminic acid

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Carminic acid[1]
Chemical structure of carminic acid
Ball-and-stick model of carminic acid
CAS number 1260-17-9 YesY
ChemSpider 14068 YesY
KEGG C11254 YesY
Jmol-3D images Image 1
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 (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references

Carminic acid (C22H20O13) is a red glucosidal hydroxyanthrapurin that occurs naturally in some scale insects, such as the cochineal and the Polish cochineal. The insects produce the acid as a deterrent to predators. 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]


  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.