Abstract 3,3'‐dihydroxy‐ß,ß‐carotene‐4,4'‐dione (DCD) is a carotenoid used for the pink coloration in animal and fish foods. Two nonsolvated and two solvated forms of this compound have been discovered and characterized using different analytical techniques. The thermodynamic stability of the relevant polymorphs is revealed. The transformation rate depends strongly on the selection of solvent medium. Moreover, different chemical stability refers to the shelf life is studied correlating to the different polymorphs. The results show the possibilities to improve the pigmentation efficiency and chemical stability by a changing in the crystal polymorphs. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Guo et al. (2009) studied this question.
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