Carotenoid radical anions and their protonated derivatives |
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| Authors: | El-Agamey Ali Edge Ruth Navaratnam Suppiah Land Edward J Truscott T George |
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| Affiliation: | School of Physical and Geographical Sciences, Keele University, Keele, Staffordshire ST5 5BG, UK. a.a.g.el-agamey@chem.keele.ac.uk |
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| Abstract: | In this study, we report the protonation reactions for astaxanthin and canthaxanthin radical anions in methanol, alkaline methanol, and aqueous 2% Triton X-100 at different pH values. The pKa values for the corresponding alpha-hydroxy radical derivatives of astaxanthin, canthaxanthin, and beta-apo-8'-carotenal were estimated in 2% Triton X-100. Also, the effects of the microenvironment and the structure of the carotenoids on the protonation rate constant are discussed. |
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