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  • Title: Effect of stereoconfiguration on ripple phases (P beta') of dipalmitoylphosphatidylcholine.
    Author: Zasadzinski JA.
    Journal: Biochim Biophys Acta; 1988 Dec 22; 946(2):235-43. PubMed ID: 3207740.
    Abstract:
    Mixtures of sn-1 (D) and sn-3 (L) enantiomers of fully hydrated dipalmitoylphosphatidylcholine (DPPC) were studied with differential scanning calorimetry and freeze-fracture microscopy. The pretransition temperature of racemic mixtures of DPPC was 1.8 C degrees below that of either pure sn-1 or sn-3 enantiomers, which had similar pretransition temperatures. The main transition temperature of racemic mixtures was also depressed, but to a lesser extent, 0.8 C degrees. Freeze-fracture images of liposomes of sn-1, sn-3, and racemic mixtures of DPPC frozen from the P beta' phase showed well-defined ripples of wavelength 13 nm. Lipid stereoconfiguration had no effect on ripple wavelength, configuration or amplitude, or on the number and nature of surface defects.
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