Supported liquid membrane on cellulose acetate matrix has been formed by using ergosterol, a fungal product as a surfactant. The behaviour of this membrane has been simulated with biological membranes by its electrochemical characterization. For this purpose membrane potential has been measured using NaCl and CaCl 2 solutions of different concentrations. Ionic transport numbers have been used to estimate fixed charge density and permselectivity. The variation of membrane potential has also been examined as a function of concentration and pH values of NaCl & CaCl 2 solutions. for complete liquid membrane formation was found to be 20 µM. It is believed that liquid membrane formation occurs when the critical micelle concentration (CMC) is exceeded. The CMC was determined by measuring surface tension and it was found to be 20 µM. Membrane resistance was measured. Ergosterol dispersions of higher concentration (35 µM) were used in the present study. Journal of Membrane Science & Technology
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