The results of the oil displacement efficiency of another biosurfactant produced by C. sphaerica cultivated in 5.0% ground-nut oil
refinery residue plus 2.5% corn steep liquor as substrates showed
75% oil spreading [27]. According to Sitohy et al. [28] the isolated
biosurfactant (0.1%) produced by C. guilliermondii NRRL Y-2075
cultivated in soy processing waste as substrate gave 100% oil displacement, while Triton X-100 gave 80% oil displacement and B.
subtilis NRRL B-94 biosurfactant gave 57% oil displacement at the
same concentration