Abstract
we have investigated the effect on the cooperativity of the Pp. - L~ main phase transition of multilamellae of dipalmitoylphosphatidylcholine IDPPC) of a I : I electrolyte up to the concentration of 3 M in the dispersion medium. By using the ESR spectroscopy with the spin label partition technique, the mean size of the cooperative unit, v~ at the centre of the transition has been calculated according to the Zimm and Bragg (J. Chem Phys. 31 (1959) 526-535) theory of cooperative transitions. By increasing the electrolyte concentration in the dispersion medium the v~ value increases suggesting that the lipid molecules in the bilayers become more tigthly packed. Screening of the electrostatic interactions between the dipoles on the polar head of the DPPC molecules with increase of the hydrophobic interactions as well as modification of the structure of the water layer around the phosphocholine fragment of DPPCS can explain the results obtained.
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