Table 5.
Antimicrobial activity of Ulva rigida (GEM) purified fractions (as explained in Figure 1).
| Sub-fractions from FG1 |
Indicator bacteria | |||||
|---|---|---|---|---|---|---|
| S. aureus ATCC 25923 | E. faecalis ATCC 29212 | A. salmonicida | ||||
| ID (mm) | MIC (μg/ml) ((μg/ml) | ID (mm) | MIC (μg/ml) (μg/ml) | ID (mm) | MIC (μg/ml) ((μg/ml) | |
| G4 | 21.6±0.5 | 62.5±0 | 22±0 | 125±0 | - | - |
| G5 | 23±1.5 | 62.5±0 | 21±1.5 | 250±0 | - | - |
| G6 | 18±0.5 | 62.5±0 | 16.3±0.3 | 250±0 | - | - |
| G7 | 10±0 | 250±0 | - | - | - | - |
| G8 | 9.6±0.5 | 250±0 | - | - | - | - |
| G9 | 11±0 | 250±0 | - | - | - | - |
| G10 | - | - | - | - | 7.3±0.5 | 250±0 |
| G11 | 15±1 | 250±0 | - | - | 7.3±1.1 | 250±0 |
| G12 | - | - | - | - | 8.3±0.5 | 250±0 |
| G13 | - | - | - | - | 10±0 | 250±0 |
| G14 | 24±1.5 | 250±0 | - | - | 10.6±0.5 | 166.6±72 |
| G15 | 22±0.5 | 250±0 | nt | nt | nt | nt |
| G16 | 21±0.5 | 250±0 | - | - | - | - |
| G23 | 7.3±0.5 | - | nt | nt | nt | nt |
| G26 | - | - | 9.6±0.5 | 250±0 | - | - |
MIC: minimal inhibitory concentration, nt: nontested; -: no activity; ID: inhibition diameter of fractions tested at concentration of 250 μg/disc.