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Flavonoids and cell membrane fluidity
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DOI：10.1016/j.foodchem.2009.12.006.png)
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The membrane fluidity characteristics of multilamellar (MLV) and extruded liposomes prepared with kaempferol (K), kaempferol-3-glucoside (KC), (-)-epigallocatechin (EGC) or (-)-epigallocatechin-3-gallate (EGCG) are presented. Kaempferol caused the highest increase in fluorescence polarisation of DPH in both liposomes (other compounds had riot) indicating that K with n(K)/n(l.ip) below 0.2 or 0.1 decreased the membrane fluidity, while at higher molar ratios the membrane fluidity increased. EPR measurements with MLV and spin probes MeFASL(10,3) and MeFASL(2,11) showed a significant decrease in fluidity in the upper part of the membrane for all flavonoids measured, and in the core of the membrane an increase in fluidity for EGCG and EGC. Computer simulation of the EPR spectra showed that the membrane of the MLV used was composed of at least three coexisting domain types with different fluidity and that the order parameter of the most ordered domains is responsible for membrane fluidity alterations. (C) 2009 Elsevier Ltd. All rights reserved.
Keyword:
Flavonoids
Fluorescence
EPR
Cell membrane fluidity
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4.7W
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24.4W
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Interaction of Tea Catechin (-)-Epigallocatechin Gallate with Lipid Bilayers.png)
BIOPHYSICAL JOURNAL
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