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The Interaction of DMSO with Model Membranes. I. Comparison of DMSO and d6-DMSO: A DSC and IR Investigation

Abstract The effect of deuterated solvents on the main phase transition (Tm) temperature of large unilamellar vesicles (LUVs) of 1,2-dipalmitoyl phosphatidylcholine (DPPC) was examined by infrared spectroscopy and differential scanning calorimetry. There was no significant difference in the Tm, ΔH of the main transition, or cooperativity when water was replaced by deuterium oxide (D2O) in the preparation of the vesicles or when dimethylsulfoxide (DMSO) was replaced by hexadeutero-dimethylsulfoxide (d6-DMSO) in either D2O or water. These results provide the necessary advance for further structural, kinetic, and thermodynamic investigations of DMSO interactions with membranes and lipid vesicles.