In this oily phase, thanks to the microemulsion, we then could first disperse sulforhodamine B or BSA-FITC, showing that hydrosoluble components, together with PEG, can be entrapped in the octanol phase. Then, after the formation of the double emulsion by pouring such dispersion in an aqueous phase containing PVA, fluorescence was mainly observed in the internal droplet, demonstrating that these dyes ended with PEG within the internal aqueous droplet (figure ).