Abstract
A method is described to measure the oxygen diffusion-concentration product, D o [ O 2] , at any locus that can be probed or labeled using nitroxide radicals. The method is based on the dependence of the spin-lattice relaxation time T 1 of the spin label on the bimolecular collision rate with oxygen. Strong Heisenberg exchange between spin label and oxygen contributes directly to T 1 of the spin label, while dipolar interactions are negligible. Both time-domain and continuous wave saturation methods for studying T 1 are considered. The method has been applied to phospholipid liposomes using fatty acid spin labels. A discontinuity in D o [ O 2] at the main phase transition was observed.
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