The study was aimed at investigating the role of asphaltenes as stabilizers for totuene-in-water miniemulsions. These miniemulsions were prepared with sodium laurylsulphate and cetyl alcohol. To confirm the amphoteric nature of the asphaltenes: 1) they were adsorbed on fluorite and their electrophoretic mobility was measured using a microelectrophoresis cell and; 2) interfacial tension measurements were carried out using a tensiometer.