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- W404178023 abstract "Most biological phospholipids contain at least one unsaturated alkyl chain. However, few order parameters of unsaturated lipids have been determined because of the difficulty associated with isotopic labeling of a double bond. Dipolar recoupling on axis with scaling and shape preservation (DROSS) is a solid-state nuclear magnetic resonance technique optimized for measuring 1 H- 13 C dipolar couplings and order param- eters in lipid membranes in the fluid phase. It has been used to determine the order profile of 1,2-dimyristoyl-sn- glycero-3-phosphocholine hydrated membranes. Here, we show an application for the measurement of local order parameters in multilamellar vesicles containing unsaturated lipids. Taking advantage of the very good 13 C chemical shift dispersion, one can easily follow the segmental order along the acyl chains and, particularly, around the double bonds where we have been able to determine the previously misassigned order parameters of each acyl chain of 1,2-dioleoyl-sn-glycero-3-phos- phocholine (DOPC). We have followed the variation of such order profiles with temperature, unsaturation content and cholesterol addition. We have found that the phase formed by DOPC with 30% cholesterol is analogous to the liquid-ordered (lo) phase. Because these experiments do not require isotopic enrichment, this technique can, in principle, be applied to natural lipids and biomembranes." @default.
- W404178023 created "2016-06-24" @default.
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- W404178023 date "2005-01-01" @default.
- W404178023 modified "2023-09-27" @default.
- W404178023 title "Order parameters of unsaturated phospholipids in membranes and the effect of cholesterol: a 1 H- 13 C solid-state NMR study" @default.
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