Abstract
Spin labelling ESR, calorimetry and31P NMR have been used to investigate dipalmitoyl phosphatidylcholine dispersions incorporated with propranolol which is a β-adrenoceptor blocking drug, widely used in the treatment of arrhythmy. The drug appears to enter the lipid bilayer also at the lowest concentrations and to induce a progressive fluidification of multilamellar vesicles. In fact, the presence of drug reduces the temperature of chain melting transition and the corresponding cooperation number. Furthermore the phase transitionL β′ −P β′ is not observable also at the lowest drug concentrations.
Published Version
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