Surface tension and CMC determination
The surface tension of the culture broth supernatant and
chemical surfactants was measured according to the Du-Nouy
methodology using a tensiometer TD1 (LaudaKonigshofen, Ger- €
many). The critical micelle concentration (CMC) was determined by
measuring the surface tension of diluted biosurfactant in distilled
water up to a constant value of surface tension