Abstract
Monovalent and divalent cations were added to a phospholipid (1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC)) solution in order to evaluate the effect of metal cations on the phospholipid monolayer. While the surface pressure-area (Π-A) isotherm of the phospholipid monolayer at the air-water interface did not change when monovalent cations (Na+, K+) were added, Π increased with the addition of divalent cations (Mg2+, Ca2+, Sr2+) according to their atomic numbers. Fourier-transform infrared spectroscopy and differential scanning calorimetry were used to evaluate the interactions between DOPC and cations. Experimental results suggest that cation valence and atomic number play an important role in the characteristic interactions with DOPC.
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