Abstract
The solubility of molecular oxygen, or dioxygen, in low weight percent (1.5%) sonicated dimyristoylphosphatidylcholine (DMPC) aqueous dispersions saturated with air has been measured as a function of temperature between 10°C and 40°C. A modified Winkler technique was used involving a dual cell coulometric titration with voltammetric endpoint detection in a mixed solvent (methanol/ water). The results indicate that dioxygen is approximately four times more soluble in the liquid crystalline bilayers (above 24°C) than in the gel state bilayers (below 24°C). The solubility of dioxygen in the bilayer does not appear to be strongly temperature dependent on either side of the 24°C phase transition. The dioxygen solubility in gel state DMPC is approximately equal to that in water at the same temperature. Our results are contrasted with recent measurements made using EPR spin labels.
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Schedule a callMore From: Biochimica et Biophysica Acta (BBA) - Biomembranes
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