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The aim of this work was to examine a possible impact of liposomes lipids   microenvironment, dictated by a chemical composition of the fatty acid   branches, on incorporation and spectral behaviour of chlorophyll a, and its   derivative, chlorophyllide a inside small liposomes. The liposomes with the   incorporated chlorophylls were made of dimirystoyl phosphatidylcholine   (DMPC), and unsaturated phosphatidylcholine (PC), containing significant   fractions of unsaturated fatty acid moieties. In order to achieve the goal,   both absorption and fluorescence polarization spectroscopy were applied, and   the obtained data for the two incorporated pigments, which play a role of   molecular sensors, were compared. In addition, quercetin, a well-known   antioxidant, was used as the (chlorophylls) emission quencher, in order to   estimate the type of environment sensed by the two pigments for the two   liposomes that differ in chemical composition. The results, based primarily   on fluorescence polarization data have shown that the emissions as well as   the emission quenching were notably affected by a change in the lipids’   chemical composition. That is an indirect proof of the impact of the   liposomes microenvironment on the incorporated pigments’ spectral behaviour.[   Projekat Ministarstva nauke Republike Srbije, br. TR-34012 i br. OI-172044

Chlorophyll a and chlorophyllide a inside liposomes made of saturated and unsaturated lipids: A possible impact of the lipids microenvironment