The invention is related to the emulsification effects achiveable by arginine and arginine analogues on carboxylic acids in aqueous and organic media and the use of these effects to solubilize, separate and remove carboxylic acids as well as increasing physical or chemical interactions and reactions. Furthermore, the invention is directed to the nanoemulsifying properties of arginine and arginine analogues on carboxlic acids and poorly soluble molecules. Solubilization effects of arginine and arginine analogues combined with the inventive use of separation methods for carboxylic acids can be used to treat persons in need of removal of fatty acids or analyze carboxylic acids from blood or process other solutions in food, pharmacy, chemistry or other industrial processings. The inventive effects of arginine and arginine analogues enable the use of methods for nano-filtration of carboxylic acids. Moreover, the use of arginine and arginine anlogues as well as carboxylic acids used to functionalize the interface o
