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  • Title: Light-harvesting properties of zinc complex of chlorophyll-a from spirulina in surfactant micellar media.
    Author: Takeuchi Y, Amao Y.
    Journal: Biometals; 2005 Feb; 18(1):15-21. PubMed ID: 15865406.
    Abstract:
    Zn chlorophyll-a was prepared from Mg chlorophyll-a from spirulina and the optical properties of the ground state and the photoexited state of Zn chlorophyll-a in aqueous surfactant micellar media were studied using UV-vis absorption, fluorescence emission spectra, electrochemical and fluorescence lifetime measurements. In comparison of the UV-vis absorption and fluorescence emission spectra of Zn chlorophyll-a and Mg chlorophyll-a, the blue-shift in the absorption bands and emission peak of Zn chlorophyll-a was observed. The energies of the first excited singlet state of Zn chlorophyll-a was 1.87 eV. The first oxidation and reduction potentials of the photoexcited singlet state of Zn chlorophyll-a were -0.67 and 0.60 V, respectively. Fluorescence lifetime of Zn chlorophyll-a was 9.0 ns in CTAB micellar solution. The fluorescence lifetime of Zn chlorophyll-a is shorter than that of Mg chlorophyll-a (9.8 ns). The photositability of Zn chlorophyll-a was superior to that of Mg chlorophyll-a in various pH conditions.
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