Adhesion Behavior of Escherichia coli Strains on Glass: Role of Cell Surface Qualitative and Quantitative Hydrophobicity in Their Attachment Ability
Table 2
Contact angles, surface tension parameters, and free energy of interaction of E. coli strains and glass surface.
Strains and substratum
Contact angles (°)
Surface tension: components and parameters (mJm−2)
Free energy of interaction (mJm−2)
θwater
θformamide
θdiiodomethane
γlw
γ+
Γ−
Hydrophobicity (ΔGiwi)
E. coli EI1
99.80 (1.23)
78.28 (3.2)
46.12 (4.02)
36.31
0.51
1.40
−70.7
E. coli 38
93.70 (0.67)
70.88 (0.34)
35.02 (3.22)
41.92
0.44
2.31
−68.5
E. coli EM3
77.58 (1.56)
66.74 (1.78)
53.7 (2.03)
32.09
0.25
13.84
−26.1
E. coli 64
74.03 (3.23)
63.35 (2.89)
46.85 (2)
35.92
0.13
15.27
−25.0
E. coli 19
74.2 (3.45)
63.85 (4.62)
64.61 (1.45)
25.87
0.60
14.93
−20.7
E. coli EM4
69.44 (2.38)
84.28 (2.01)
42.2 (3.66)
38.39
7.09
45.82
11.8
E. coli 13
54.15 (1.43)
53.6 (1.23)
45.41(0.96)
36.70
0.04
35.32
13.4
E. coli 76
56.5 (3.02)
57.8 (2.05)
64.92 (2.2)
25.69
0.62
35.15
14.6
E. coli EI4
75.38 (3.56)
92.06 (4.01)
64.2 (4.33)
26.11
4.84
42.71
16.6
E. coli EI3
33.22 (0.96)
34.58 (5.1)
73.42 (1.06)
20.95
5.15
46.11
19.3
E. coli EI2
42.52 (2.77)
44.22 (2.33)
65.68 (4.83)
25.28
1.98
42.67
21.3
E. coli 65
51.43 (1.43)
74.38 (0.89)
64.98 (1.36)
25.66
1.31
66.91
48.6
Glass
36.14 (3.2)
46.28 (1.53)
59.52 (2.15)
28.79
0.73
54.90
38.61
Standard deviation is given in the parentheses. θwater: contact angle with water/qualitative hydrophobicity; θformamide: contact angle with formamide; θdiiodomethane: contact angle with diiodomethane; γLW: Lifshitz–van der Waals forces; γ−: electron donor character; γ+: electron acceptor character; ΔGiwi: free energy of interaction/quantitative hydrophobicity.
