Abstract
Natural surfactant possesses the ability to rapidly reduce the surface tension of a bubble pulsating at 20 cycles per min at 37°C to less than 30 dyn/cm at maximum radius and to less than 1 dyn/cm at minimum radius. The preparation of two artificial surfactant systems, containing either dipalmitoylphosphatidylcholine (DPPC) and phosphatidylethanolamine (PE) (5:5), or DPPC plus PE and phosphatidylglycerol (5:4:1 or 6:3:1) , is described. Formation of artificial surfactants which mimic the essential properties of natural surfactant was correlated with the appearance of particles of aggregated lipids. The effects of lipid composition, calcium ion concentration, pH, temperature and mechanical agitation were determined. It is proposed that these artificial surfactant systems may produce a surface-active monolayer through the involvement of nonbilayer structures with properties similar to hexagonal H II phase.
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Schedule a callMore From: Biochimica et Biophysica Acta (BBA) - Biomembranes
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