Solvation of oxygen in lecithin bilayers. |
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Authors: | R Kimmich A Peters |
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Affiliation: | Abteilung für Experimentelle Physik II, Universität Ulm, 7900 Ulm, Postfach 4066, Germany |
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Abstract: | The solubility of oxygen in dipalmitoyllecithin (DPL) and paraffinc C19 has been investigated by measurement of the enhanced proton relaxation rates under the influence of oxygen pressure. The paraffin shows a noticeable effect in the rotator phase, but not so in the crystalline phase. tin contrast to paraffins, both phases of DPL-bilayers dissolve oxygen, but the solubility in the liquid-crystalline phase is greater than in the crystalline state by a factor approximately equal to 3. Furthermore, the experiments indicate a distribution of electron relaxation times in the crystalline phase in contrast to the liquid-crystalline phase. A possible explanation of this behaviour is a multiphase structure of the "crystalline' lamellae. The biological relevance of thbse results could be a triggering of the gas-transport by the alveolar lining of lungs, if cyclic phase transitions occur during the breathing-cycle. |
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