Purification and characterization of a surfactin-like molecule produced by Bacillus sp. H2O-1 and its antagonistic effect against sulfate reducing bacteria

Table 3 Energy properties of conditioned surfaces including the total surface free energy, the Lifshitz-van der Waals component, the Lewis acid–base properties, the electron acceptor component, the electron donor component and the surface hydrophobicity

SURFACE/TREATMENT	γLW(mJ/m²)	γ-(mJ/m²)	γ+(mJ/m²)	γAB(mJ/m²)	γTOT(mJ/m²)	ΔGlLw(mJ/m²)
Control	42.02	2.68	0.85	−3.03	41	−98.7
AMS H2O-1	57.22	0.95	26.94	−10.11	47.11	−13.8
Surfactin	68.57	0.5	42.16	−9.19	59.39	23.7
Control	29.03	2.59	1.6	−4.07	24.96	−119.1
AMS H2O-1	47.08	0.04	14.03	−1.46	45.62	−51.0
Surfactin	62.71	0.63	54.11	−11.64	51.07	39.3
CARBON STEEL
Control	75.55	2.81	40.71	−21.37	54.17	17.7
AMS H2O-1	64.68	3.5	7.68	−10.37	54.31	−81.0
Surfactin	71.69	1.5	49.77	−17.27	54.42	30.2
GALVANIZED STEEL
Control	35.09	0.66	4.93	−3.61	31.48	−97.9
AMS H2O-1	16.69	1.24	43.14	−14.61	2.08	−6.8
Surfactin	49.71	1.72	64.89	−21.1	28.61	42.7
POLYSTYRENE
Control	43.87	1.45	9.78	−7.53	36.34	−69.3
AMS H2O-1	62.1	1.07	18.77	−8.95	53.15	−32.1
Surfactin	48.01	0.37	8.96	−3.62	44.4	−70.5

ISSN: 1471-2180