Combined Use of Steady-State Fluorescence Emission and Anisotropy of Merocyanine 540 To Distinguish Crystalline, Gel, Ripple, and Liquid Crystalline Phases in Dipalmitoylphosphatidylcholine Bilayers
Abstract:The various lamellar phases of dipalmitoylphosphadtidylcholine bilayers with and without cholesterol were used to assess the versatility of the fluorescent probe merocyanine 540 through simultaneous measurements of emission intensity, spectral shape, and steady-state anisotropy. Induction of the crystalline phase (L c ') by preincubation at 4°C produced a wavelength dependence of anisotropy which was strong at 15 and 25°C, weak at 38°C, and minimal above the main transition (>~41.5°C) or after returning the te… Show more
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