Abstract
Formation of reversed micellar systems using biocompatible components was revealed by a significant increase of water content in the organic phase. Soybean lecithin (SL), which is a mixture of different phospholipids, and phosphatidylcholine (PC) purified from soybean were used as the amphiphilic molecule. Fatty acid and fatty acid ethyl esters were used as the organic solvent. Reversed micelles were formed in the following combinations of (amphiphilic molecule)/(organic solvent): SL/ethyl caproate, SL/ethyl oleate, SL/ethyl linoleate, PC/ethyl caproate, and PC/oleic acid. Characterization of the micelles using small angle X-ray scattering analysis was presented. Reversed micelles formed in SL/ethyl caproate, SL/ethyl oleate, and PC/ethyl caproate systems were spherical. Their radius of gyration was about 40 Å when the water concentration in the organic phase was maximal. Maximal water concentrations in SL/ethyl caproate and PC/ethyl caproate reversed micellar systems decreased with increasing salt concentration in the aqueous phase. Micelle sizes also decreased with increased salt concentration. The extraction of protein cytochrome c using the reversed micellar system was demonstrated. Application of these reversed micellar systems will expand to pharmaceutical and food industries.
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