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Table 1 Oil/water interfacial tension between diesel oil and solutions containing different surfactants

From: Designer bioemulsifiers based on combinations of different polysaccharides with the novel emulsifying esterase AXE from Bacillus subtilis CICC 20034

Oil/water phase

σ (mN/m)

Diesel/H2O

26.64 ± 0.02

Diesel/Tris–HCl buffer

21.25 ± 0.07

Diesel/SDS

1.72 ± 0.01

Diesel/BSA

17.41 ± 0.09

Diesel/AXE

16.09 ± 0.07

Diesel/xanthan gum

25.20 ± 0.11

Diesel/Tween 20

3.89 ± 0.02

  1. The oil/water interfacial tension was measured at 25 °C by the du Nouy ring method, and 500 µg/ml protein or surfactant were dissolved in Tris–HCl buffer solution (50 mM, pH 7.4)