Table 4.
Inhibition zones obtained by disk diffusion assay (mm).
| Macroalgae Species | Month/Year Collection | Location Collection | Test Organisms—Inhibition Zone (mm) | |||||
|---|---|---|---|---|---|---|---|---|
| Bc | Bs | Gs | Lm | Sa | Sh | |||
|
Bifurcaria
bifurcata |
August 2017 | Cantabria | 13.6 ± 0.5 | 13.0 ± 0.0 | 17.6 ± 0.0 | 18.3 ± 1.0 | 13.6 ± 0.4 | 15.3 ± 2.3 |
| May 2019 | Galicia | nd | nd | 15.7 ± 0.0 | 18.4 ± 0.6 | 13.5 ± 0.4 | +/− | |
| May 2019 | Galicia | nd | nd | 14.6 ± 0.0 | 17.1 ± 1.5 | +/− | nd | |
| December 2019 | Cantabria | 12.7 ± 0.5 | 11.2 ± 0.8 | 18.3 ± 0.0 | 19.2 ± 0.4 | +/− | 14.5 ± 0.2 | |
|
Ericaria
selaginoides |
August 2017 | Cantabria | 11.7 ± 0.6 | 11.5 ± 0.9 | 13.4 ± 0.0 | 13.9 ± 1.4 | 12.8 ± 0.0 | nd |
| August 2019 | Galicia | nd | nd | +/− | nd | +/− | +/− | |
|
Dictyota
dichotoma |
September 2019 | Cantabria | 10.4 ± 0.0 | 12.4 ± 0.2 | 15.2 ± 0.0 | 10.4 ± 0.0 | +/− | nd |
Data are presented as mean ± standard deviation (SD) of 3 determinations. Bc: Bacillus cereus; Bs: Bacillus subtilis; Gs: Geobacillus stearothermophilus; Lm: Listeria monocytogenes; Sa: Staphylococcus aureus; Sh: Staphylococcus haemolyticus; nd: non-detected, +/−: bacteriostatic effect.