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  • Title: Identification of a new excited state responsible for the in vivo unique absorption band of siphonaxanthin in the green alga Codium fragile.
    Author: Akimoto S, Tomo T, Naitoh Y, Otomo A, Murakami A, Mimuro M.
    Journal: J Phys Chem B; 2007 Aug 09; 111(31):9179-81. PubMed ID: 17629321.
    Abstract:
    A marine green alga, Codium fragile, exhibits a characteristic in vivo absorption band of a specific keto-carotenoid, siphonaxanthin, at 535 nm. We examined the ultrafast fluorescence kinetics by direct excitation of this band after purification of light-harvesting complex II. On the basis of a high fluorescence anisotropy (0.39) up to 1 ps and a very short lifetime (60 fs), we identified the 535 nm band as a new electronically excited state (Sx) located between the S1 and S2 states. Excited-state dynamics of the Sx state were further discussed in relation to the energy transfer processes in the complexes.
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