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• W1993519437 abstract "One- and two-dimensional 31P-exchange NMR has been used to investigate chemical exchange between coexisting lamellar (Lα) and non-lamellar (hexagonal H11 and cubic I2) lipid phases. Samples of DOPE, DOPE/DOPC (9:1 and 7:3), DOPE/cholesterol sulfate (9:1), DOPC/monoolein (MO) (3:7 and 1:1), and DOPC/DOPE/cholesterol (1:1:2) were macroscopically oriented on glass plates and studied at the 0° orientation (angle between the bilayer normal and the external magnetic field), where the Lα, H11, and I2 resonances are resolved. A reversible Lα to H11 transition was observed for all of the samples except for the DOPC/MO mixtures, which displayed a reversible Lα to I2 transition. Near-equilibrium mixtures of Lα and either H11 or I2 were obtained after prolonged incubation at a given temperature. Two-dimensional exchange experiments were performed on DOPE at 9–14°C for mixing times ranging from 500 ms to 2 s. For all samples, one-dimensional exchange experiments were performed for mixing times ranging from 100 ms to 4 s, at temperatures ranging from 3°C to 73°C. No evidence of lipid exchange between lamellar and non-lamellar phases was observed, indicating that if such a process occurs it is either very slow on the seconds' timescale, or involves an undetectable quantity of lipid. The results place constraints on the stability or kinetic behaviour of proposed transition intermediates (Siegel, D.P. (1986) Biophys. J. 49, 1155–1170)." @default.
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• W1993519437 date "1992-07-01" @default.
• W1993519437 modified "2023-10-14" @default.
• W1993519437 title "Chemical exchange between lamellar and non-lamellar lipid phases. A one- and two-dimensional 31P-NMR study" @default.
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• W1993519437 doi "https://doi.org/10.1016/0005-2736(92)90026-i" @default.
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