ESR studies on the ripple phase in multilamellar phospholipid bilayers
作者： Kazuaki Tsuchida , Ichiro Hatta
DOI: 10.1016/0005-2736(88)90364-1
关键词:
摘要: The structure of the ripple phase in multilamellar DPPC liposomes was studied by measuring electron spin resonance (ESR) spectra stearic acid probe (16-SASL). spectrum observed P beta' is explained terms superposition ordered- and disordered-type spectra. This fact suggests existence a nonhomogeneous phase, i.e., coexistence ordered region present L disordered alpha phase. fluidity acyl chains both regions intensity ratio to total were estimated from ESR at various temperatures. did not exhibit remarkable temperature dependence. On other hand, showed almost similar dependence partitioning TEMPO measurement enthalpy curve DSC measurement, that is, value increases slowly near pretransition temperature, constant abruptly main transition with temperature. proportion be about one-fifth Based upon above results, model for proposed.
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