Violaxanthin absorption spectra

FIGURE 2.1 Energy of the 0-0 vibrational transition in the principal electronic absorption spectrum of violaxanthin (l Ag-—>1 BU+), recorded in different organic solvents, versus the polarizability term, dependent on the refraction index of the solvent (n). The dashed line corresponds to the position of the absorption band for violaxanthin embedded into the liposomes formed with DMPC (Gruszecki and Sielewiesiuk, 1990) and the arrow corresponds to the polarizability term of the hydrophobic core of the membrane (n = 1.44). 

In this model, the function of one remaining fucoxanthin and one violaxanthin has not yet been determined (see Fig. 8). By comparing the fluorescence excitation spectrum with the absorption spectrum of FCPA, it is seen that a decrease of 15-25% in transfer efficiency appears in the 480 nm-region, which would be consistent with an absence ofcoupling by two out of the 11 carotenoid molecules. 

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