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

Authors: Harris, Michael; Stein, Bridget K.; Tyman, John H.P.; Williams, Christopher M.

Source: Journal of Chemical Research, Volume 2009, Number 7, July 2009 , pp. 407-409(3)

Publisher: Science Reviews 2000 Ltd

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Abstract:

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.

Keywords: ALIZARIN; CARMINIC ACID; CARMINE; MASS SPECTROMETRY; ORBITAL NEGATIVE ANALYSIS; 13C SOLID STATE SPECTRA

Document Type: Research article

DOI: http://dx.doi.org/10.3184/030823409X460768

Publication date: 2009-07-01

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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.
Recent papers have described new synthetic methods, new heterocyclic compounds, new natural products, and the inorganic chemistry of metal complexes. Now in its 34th year, the Journal of Chemical Research was established in 1977 as a joint venture by the British, French and German chemical societies and maintains the high standards set by the founding societies. Each paper is independently peer reviewed and only carefully evaluated contributions are accepted.
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