TABLE 3.
Siderophore (column CAS assay) and antibacterial activity of the raw extract from a culture of V. furnissii S0821 and of the six derived fractions (F1 to F6)a
| Sample | CAS assay | Inhibition zone (mm) |
|---|---|---|
| Raw extract | Yellow | 20 |
| F1 | Blue | 0 |
| F2 | Blue | 0 |
| F3 | Blue | 0 |
| F4 | Blue | 0 |
| F5 | Dark orange | 9 |
| F6 | Yellow | 23 |
| Blank | Blue | 0 |
a
The addition of a siderophore to the CAS solution causes a change in color from dark blue to orange-yellow. Activity against V. anguillarum is measured as the diameter of inhibition zones.