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 of the anthraquinone system.
References
1.
Bingham S.J.
,
Ciuffreda P.
,
Fiecchi A.
,
Cighetti G.
,
Muir M.
,
Scala A.
, and
Tyman J. H. P.
, J. Chem. Soc., Perkin, Trans. 1 , 1998 , 575 –582 .
2.
Baranyovits F.L. C.
, Endeavour , 1978 , 2 , 85 –92 .
3.
Schweppe H.
, and
Roosen–Runge H.
, Artists pigments: Handbook of their history and characteristics , Vol 2 , ed.
Peller R.L.
, Cambridge University Press .
4.
Kiel E.G.
, and
Heertjes P. M.
, J. Soc. Dyers Col. , 1963 , 79 , 363 .
5.
Hoffmann E.
, thesis , University of Dresden , 1937 .
6.
Rutishauer M.
, thesis , Zurich , University of Zurich , 1940 .
7.
Overeem J.C.
, and
Van der Kirk G. J. M.
, Rec. Trav. Chim. , 1964 , 83 , 995 .
8.
Meloan S.N.
,
Valentine L. S.
, and
Puchtler H.
, Histochemie , 1971 , 27 , 446 .
9.
Wunderlich C.-H.
, and
Bergerhoff G.
, Chem. Ber. , 1994 , 127 , 1285 .
10.
Schmitt P.
, and
Gunther H.
, Org. Magn. Reson. , 1984 , 22 , 446 .
11.
Payne P.B.
, and
Tyman J. H. P.
, J. Chem. Res. , 2006 , 691 .
12.
Sumitomo N.
,
Kawasaki Y.
,
Sato K.
,
Aoki H.
,
Ichi T.
,
Koda T.
,
Yamazaki T.
, and
Maitani T.
, J. Food Hyg. Soc. Japan , 2002 , 43 , 18 –23 .