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| Home > In process > Structural characterization of phosphatidylcholine lipid monolayers across the liquid-expanded/liquid-condensed phase transition |
| Journal Article | PUBDB-2026-01638 |
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2026
Royal Soc. of Chemistry
London
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Please use a persistent id in citations: doi:10.1039/D6SM00208K
Abstract: Lipid layers are the foundational element of biological membranes and can exhibit heterogeneous structural ordering that impacts membrane function. However, important thermodynamicaspects of transitions between fluid and ordered lipid phases are still not fully understood. Using state-of-the-art grazing-incidence X-ray diffraction, we are able to reassess the structural transition between the fluid, liquid-expanded (LE) phase and the chain crystalline, liquid condensed (LC) phase of Langmuir monolayers of a saturated double-chain phosphatidylcholine (1,2-dipentadecanoyl-sn-glycero-3-phosphocholine, diC15PC) at the air water interface, induced by lateral compression. While the sharp diffraction peaks characteristic for the LC phase are seen at phase coexistence but not in the LE phase, the broad peak indicative of LE-like short-range correlations persists throughout the entire transition and beyond. The monolayer’s structural parameters are found to depend on the transition progress. These observations indicate that lateral compression at typical speeds is not quasi-static and thereby shed some light on the non-horizontality of the transition plateauin pressure–area isotherms.
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