Hydrophobic substrate Average emulsifying activity (SD)
Emulsan (U/mg) Apoemulsan + esterase (U/mg of apoemulsan/ mg of esterase)
Anthracene 0 970 (170)
Crude oil 1,100 (140) 4,900 (800)
Dicyclohexane 310 (50) 2,800 (500)
Diesel oil 730 (130) 4,200 (700)
Eicosane 0 1,800 (260)
Fluoranthene 0 590 (150)
Heptadecane 120 (25) 2,400 (380)
Immersion oil 75 (15) 780 (100)
2-Methylnapthalene 0 2,000 (400)
Mineral oil 450 (80) 3,000 (400)
Octadecane 0 2,200 (320)
Petroleum refinery sludge 580 (95) 1,200 (220)
Pyrene 0 420 (75)
Soya oil 0 1,300 (190)
Squalene 0 600 (150)
n-Tetracosane 0 510 (75)
[Gutnick et al, 2003]
Table 6: Enhancement of apoemulsan activity on different hydrophobic substrates by recombinant esterase.