Add time:08/26/2019         Source:sciencedirect.com

A new emulsification method using a liquid crystalline phase of an ionic surfactant, l-arginine β-branched monoalkyl phosphate (R6R10MP-1Arg), which is hardly affected by temperature, has been developed. In this method, a dispersed phase (oil) is added to the liquid crystalline phase to form a gel-like oil-in-liquid crystal (O/LC) emulsion, followed by dilution with water to form a fine three-phase emulsion in which individual oil droplets are surrounded by liquid crystalline phase. From the spin labeling method of electron paramagnetic resonance, it was revealed that the presence of an appropriate amount of glycerol enhanced the rigidity of bilayers forming a lamellar liquid crystal thus promoting the formation of O/LC emulsions. The phase diagram of the R6R10MP-1Arg/oil/glycerol/water system indicates that the O/LC emulsions can be formed over quite a wide range of oil/surfactant ratios and that the droplet sizes of the resulting emulsions chiefly depended upon the oil/surfactant ratio. Submicro- and fine macroemulsions of nonpolar oils and polar oils were prepared regardless of their required hydrophil-lipophil balance by using this method.

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