“…In aqueous media, biosurfactants, like surfactants, have different types of aggregates depending on their structure (Sánchez et al, 2007;Imura et al, 2007). Furthermore, it has been reported that biosurfactant aggregation properties depend on the pH of the medium (Israelachvili et al, 1976;Ishigami et al, 1987Ishigami et al, , 1993Champion et al, 1995).…”