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The structure of the colourant/pigment, carmine derived from carminic acid

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The colourant/pigment carmine synthesised from carminic acid and calcium and aluminium acetates has been examined chemically and spectroscopically to determine its structure. As with alizarin, it appears probable that the material is a tetramer but composed of four carminic acid units with aluminium involved with the 5,6-dioxy groups in five-membered rings and calcium chelated with the 10-carbonyl group ofthe anthraquinone system.
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Keywords: 13C SOLID STATE SPECTRA; ALIZARIN; CARMINE; CARMINIC ACID; MASS SPECTROMETRY; ORBITAL NEGATIVE ANALYSIS

Document Type: Research Article

Publication date: 01 July 2009

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  • The Journal of Chemical Research is a monthly journal which has a broad international authorship and publishes research papers and reviews in all branches of experimental chemistry.

    Established in 1977 as a joint venture by the British, French and German chemical societies it maintains the high standards set by the founding societies. Each paper is independently peer reviewed and only carefully evaluated contributions are accepted.

    Recent papers have described new synthetic methods, new heterocyclic compounds, new natural products, and the inorganic chemistry of metal complexes.

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