Absence of chiral domains in mixtures of dipalmitoylphosphatidylcholine molecules of opposite chirality

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We present calorimetric data for liposome mixtures of l-dipalmitoylphosphatidylcholine with perdeuterated hydrocarbon chains (l-DPPC-d₆₂) and d-DPPC at varying molar concentrations and excess water ({}30% by wt.) conditions. The data are consistent with a binary system whose components exhibit complete mutual solid solubility. Therefore, the asymmetric ripples observed in racemic dimyristoylphosphatidylcholine bilayers in the P_B|IH phase [Katsaras and Raghunathan, Phys. Rev. Lett. 74, 2022 (1995)] are not the result of pure enantiomer domains.