Abstract
As an alternative to a fluorescent probe approach, the intrinsic fluorescence of reduced forms of prenylquinones has been exploited, which offers a convenient means of determining directly motional properties of these molecules. The steady-state fluorescence anisotropy measurements of plastoquinols (PQH 2) and α-tocopherol (α-Toc) incorporated into phospholipid liposomes have been performed. The effect of prenyllipid concentration, PQH 2 side chain length and the composition of the membranes has been studied. For the data interpretation, the fundamental anisotropy of α-Toc, PQH 2, ubiquinol-10 and α-tocopherolquinol, as well as the angles between the absorption and emission transition moments have been also determined. It was concluded that α-Toc shows very low mobility in the lipid bilayer, whereas PQH 2-9 displays significant motional freedom in dipalmitoylphosphatidylcholine vesicles and even higher in egg yolk lecithin membranes.
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