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The first excited singlet state (S 1 ) of carotenoids (also termed 2A g− ) plays a key role in photosynthetic excitation energy transfer due to its close proximity to the S 1 (Q y ) level of chlorophylls. The determination of carotenoid 2A g− energies by optical techniques is difficult; transitions from the ground state (S 0 , 1A g ...
Photoprotection by carotenoids is generally considered to be based on the photophysical quenching of triplets and singlet oxygen. There is also accumulating evidence of an alternative, chemical quenching of triplets and singlet oxygen by carotenoids. We report the identification of relatively stable cyclic mono- and diendoperoxides as first products of such an alternative reaction. Nevertheless, these...
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