Fluorescence polarization of triple-chromophore complexes with energy transfer
- 20 September 1994
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 33 (27) , 6303-6306
- https://doi.org/10.1364/ao.33.006303
Abstract
The formula for the determination of a fluorescence polarization degree is derived for triple-chromophore complexes with energy transfer: P = (3B − 1 + 2A)/(3 + B + 4A). In this formula B = q12 cos2(ϑ12) + q13 cos2(ϑ13) + q23 cos2(ϑ23) and parameters A and qij are dependent on the kinetic parameters of energy exchange and the chromophore spectroscopic parameters. The angle ϑij is the angle between the transition dipole moments of the i and j chromophores. The formula was tested for the particular case of the C-phycocyanin (C-PC) of the blue-green algae Agmenellum quadruplicatum, which contain three chromophores, α-84, β-84, and β-155. Polarized spectra were calculated for both the emission and the excitation spectra of C-PC β subunits and monomers.Keywords
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