Influence of Surface Properties on the Adhesion of Staphylococcus epidermidis to Acrylic and Silicone

Table 2

Water (𝜃_𝑊), formamide (𝜃_𝐹), and 𝛼-bromonaphtalene (𝜃_𝛼-𝐵) contact angles (in degrees), surface tension components, and hydrophobicity (in mJ/m²) of the surface of S. epidermidis strains.

S. epidermidis strain	Contact angle  ±  SD (^°)			Surface tension components (mJ/m^2)			ΔGiwi (mJ/m^2)
	𝜃𝑊	𝜃𝐹	𝜃𝛼-𝐵	𝛾^LW	𝛾^+	𝛾^−
IE214	22.3±3.5	21±1.2	59±2.1	20.6	7.9	56.7	20.3
IE186	21.6±1.6	29.9±4.0	54.5±2.0	27.7	2.5	55.5	32.5
9142	25.6±0.9	25.4±2.6	57.0±1.4	26.5	4.0	48.4	22.8
9142-M10	21.8±1.2	19.0±1.9	54.7±1.0	27.6	4.3	48.4	22.0
1457	31.8±1.0	31.4±2.5	53.2±1.5	28.4	2.7	45.9	22.8
1457-M10	24.7±1.8	17.3±0.7	49.6±0.9	30.1	3.8	45.3	19.6
IE75	27.1±1.0	26.5±1.6	50.4±1.3	29.8	2.7	47.9	24.2
LE7	23.7±0.7	9.4±0.6	52.3±1.3	28.8	5.0	43.6	16.5

SD: standard deviation; 𝛾^LW: apolar Lifshitz-van der Waals surface free energy component; 𝛾⁺: electron acceptor surface free energy component; 𝛾⁻: electron donor surface free energy component; ΔG_iwi: degree of hydrophobicity.