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. 1993 Nov;65(5):2237–2247. doi: 10.1016/S0006-3495(93)81257-8

Lipid clustering in bilayers detected by the fluorescence kinetics and anisotropy of trans-parinaric acid.

C Reyes Mateo 1, J C Brochon 1, M Pilar Lillo 1, A Ulises Acuña 1
PMCID: PMC1225955  PMID: 8298047

Abstract

Fluid heterogeneity in lipid bilayers and shows a simple and useful method to quantify this heterogeneity. Taking advantage of the maximum entropy method, we have resolved the probe fluorescence lifetime distributions in homogeneous solutions and in single and two-component lipid bilayers at different temperatures. A precise description of the emission kinetics was obtained as a function of viscosity in the homogeneous solution and as a function of the phase composition (gel/fluid) in the lipid bilayers. These data show, unambiguously, that the same distribution pattern, with two well resolved lifetime classes, is observed both in pure solvents and in fluid bilayers. This distribution is modified during the thermotropic phase transition, with the appearance of a long lifetime component. The anisotropy experiments confirm that the amplitude of this component is proportional to the fraction of probe located in the gel phase. From this fraction we have quantified the amount of gel phase in the binary bilayer system dimyristoyl phosphatidylcholine/dipalmitoyl phosphatidylcholine and determined the thermotropic phase diagram of the mixture. This phase diagram agrees well with that calculated assuming ideal mixing of the lipids (Marbrey, S., and J.M. Sturtevant. 1976. Proc. Natl. Acad. Sci. USA. 73:862-3866).

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Selected References

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