Table 4.

Surface Energy Profile of Various Biologic Materials

Substrate	${\gamma }_s$	${\gamma }_{\mathit{s}}^{\mathit{LW}}$	${\gamma }_{\mathit{s}}^{\mathit{AB}}$	${\gamma }_{\mathit{s}}^{+}$	${\gamma }_{\mathit{s}}^{-}$
Collagen, insolublea	45.75 ± 0.83	40.08 ± 0.46	5.67 ± 0.75	1.51 ± 0.39	6.90 ± 1.52
Collagen, solubleb	37.08 ± 2.15	30.13 ± 1.22	6.95 ± 1.70	0.806 ± 0.26	16.08 ± 3.99
S. aureusc	43.91 ± 0.50	39.63 ± 0.37	4.29 ± 0.49	0.066 ± 0.014	73.54 ± 0.69
P. aeruginosac	39.26 ± 0.77	34.82 ± 0.46	4.44 ± 0.78	0.089 ± 0.029	69.07 ± 1.99

All units are mJ/m² ± SEM where number of samples (N) is 18 (collagen, insoluble), 36 (collagen, soluble), 21 (S. aureus), and 18 (P. aeruginosa). See Transparent Methods.

^aCalculations based on contact angles from bromonaphthalene, formamide, and water for insoluble collagen (100 μg/mL).

^bCalculations based on contact angles from bromonaphthalene, formamide, and water for soluble collagen (100 μg/mL) in phosphate buffer solution (1x, pH = 7.4).

^cCalculations based on contact angles from bromonaphthalene, dimethylsulfoxide, and water.