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EXCITATION ENERGY TRANSFER IN BILIRUBIN‐CHLOROPHYLL AGGREGATES
Author(s) -
MIEDZIWKO E.,
FRACKOWIAK D.
Publication year - 1969
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1969.tb07226.x
Subject(s) - fluorescence , chemistry , photochemistry , excitation , chlorophyll , polarization (electrochemistry) , absorption spectroscopy , chlorophyll a , wavelength , energy transfer , absorption (acoustics) , j aggregate , spectral line , quantum yield , analytical chemistry (journal) , materials science , optics , molecule , chemical physics , optoelectronics , chromatography , physics , biochemistry , organic chemistry , quantum mechanics , astronomy
— Solutions of chlorophyll a (chl a ) with different concentrations of bilirubin (blr) were used as a model system for studying the mechanism of energy transfer between bili‐proteins and chl in blue‐green algae. Several optical properties such as the absorption spectra, emission spectra for different wavelengths of excitation, degree of polarization and lifetime of fluorescence were measured. The measurements were carried out in several solvents (of different hydrogen bond‐forming capacities) and at various dye concentrations. The results indicate that aggregates of chl with blr are formed. Energy absorbed by blr in the aggregates is emitted as chlorophyll fluorescence, indicating energy transfer from blr to chl within the aggregate. The fluorescence yield and fluorescence polarization of aggregates are lower than those of isolated chl.