Table 2. Surface Free Energy Components and Parameters Together with Zeta Potentials for Uncoated and DDS-Coated Glass Surfaces as Well as for S. salivarius HBC12 and S. salivarius HB7, Respectivelya.
| surface
free energy components and parameters (mJ m–2) |
||||
|---|---|---|---|---|
| glass | DDS-coated glass | S. salivarius HBC12 | S. salivarius HB7 | |
| γ | 54.9 ± 1.1 | 27.7 ± 1.0 | 51.5 ± 2.6 | 57.0 ± 1.2 |
| γLW | 34.0 ± 3.0 | 26.8 ± 1.3 | 40.1 ± 7.9 | 46.3 ± 2.1 |
| γAB | 21.1 ± 3.8 | 0.4 ± 0.4 | 11.5 ± 8.8 | 10.6 ± 3.2 |
| γ– | 48.0 ± 0.8 | 2.1 ± 1.8 | 51.8 ± 4.9 | 35.1 ± 10.2 |
| γ+ | 2.3 ± 0.9 | 0.4 ± 0.7 | 0.9 ± 0.9 | 1.0 ± 0.8 |
| γ–/γ+ | 20.6 ± 0.9 | 4.1 ± 3.2 | 59.7 ± 5.5 | 35.1 ± 13.5 |
| zeta
potentials (mV) |
||||
|---|---|---|---|---|
| glass | DDS-coated glass | S. salivarius HBC12 | S. salivarius HB7 | |
| 0.57 mM | –84.9 ± 0.4 | –55.2 ± 1.4 | –20.0 ± 0.4 | –16.9 ± 2.4 |
| 57 mM | –39.5 ± 0.6 | –27.8 ± 0.0 | –8.2 ± 0.2 | –9.1 ± 2.5 |
a
Data regarding surface energetics represent averages with standard deviations over three measurements on three different glass surfaces of each type and bacterial lawns prepared from three different bacterial cultures. Bacterial zeta potentials are averages with standard deviations over three experiments with different bacterial cultures, while substratum zeta potentials are averages with standard deviations over three streaming potential measurements with different uncoated and DDS-coated surfaces.