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Molecules 2012, 17(1), 1039-1054; doi:10.3390/molecules17011039
Article

The Metal Cation Chelating Capacity of Astaxanthin. Does This Have Any Influence on Antiradical Activity?

1
,
2
 and
1,*,*
Received: 30 November 2011 / Revised: 16 December 2011 / Accepted: 5 January 2012 / Published: 20 January 2012
(This article belongs to the Special Issue Carotenoids)
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Abstract

In this Density Functional Theory study, it became apparent that astaxanthin (ASTA) may form metal ion complexes with metal cations such as Ca+2, Cu+2, Pb+2, Zn+2, Cd+2 and Hg+2. The presence of metal cations induces changes in the maximum absorption bands which are red shifted in all cases. Therefore, in the case of compounds where metal ions are interacting with ASTA, they are redder in color. Moreover, the antiradical capacity of some ASTA-metal cationic complexes was studied by assessing their vertical ionization energy and vertical electron affinity, reaching the conclusion that metal complexes are slightly better electron donors and better electron acceptors than ASTA.
Keywords: carotenoids; astaxanthin; oxidative stress; antioxidant; chelating compound; metal ions; antireductant; antiradical carotenoids; astaxanthin; oxidative stress; antioxidant; chelating compound; metal ions; antireductant; antiradical
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Hernández-Marin, E.; Barbosa, A.; Martínez, A. The Metal Cation Chelating Capacity of Astaxanthin. Does This Have Any Influence on Antiradical Activity? Molecules 2012, 17, 1039-1054.

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