Comment on: Determination of canthaxanthin in the red coral (Corallium rubrum) from Marseille by HPLC combined with UV and MS detection (Cvejic et al. Mar Biol 152:855–862, 2007)
Comment and Reply
We read with interest the article entitled: “Determination of canthaxanthin in the red coral ( Corallium rubrum) from Marseille by HPLC combined with UV and MS detection”. To our knowledge, this work is the first attempt to date to determine the exact chemical composition of the pigments contained in the coral from C. rubrum. However, using Raman spectroscopy, Merlin and Delé-Dubois ( 1986) were the first to indicate in 1986 that some corals (red C. rubrum included) are not colored by carotenoids (the family of pigments to which canthaxanthin belongs), but by trans-polyacetylene (called here “unsubstituted polyene”). We have recently confirmed these results on a number of C. rubrum specimens using Raman spectroscopy (Fig. 1). Although they give overall similar spectra, unsubstituted polyenes and carotenoids can be separated on the basis of their ν 2 vibration. It is at about 1,130 (±15) for unsubstituted polyenes and at approximately 1,155 (±10) cm −1for carotenoids. More precisely, this...
KeywordsCarotenoid Raman Spectroscopy Mollusk Visible Absorption Coloration System
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