TABLE 4.
FBC index and interactions of paired combinations of selected EOs and extracts against Escherichia coli and Listeria monocytogenes.
| Bacteria | Combination | MBC (A alone) | MBC (B alone) | MBC (A in the presence of B) | MBC (B in the presence of A) | FBC A | FBC B | FBC | Interpretation |
|---|---|---|---|---|---|---|---|---|---|
| E. coli | PP + Lav | 6.25 | 12.5 | 0.78125 | 3.125 | 0.125 | 0.25 | 0.375 | Synergism |
| PP + Thyme | 6.25 | 12.5 | 0.1953125 | 3.125 | 0.0313 | 0.25 | 0.2813 | Synergism | |
| PP + FjPl EO | 6.25 | 50 | 0.1953125 | 50 | 0.0313 | 1 | 1.0313 | Additive | |
| PP + FjLfEO | 6.25 | 50 | 0.390625 | 50 | 0.0625 | 1 | 1.0625 | Additive | |
| PP + FjPlEx | 6.25 | 25 | 0.390625 | 6.25 | 0.125 | 0.25 | 0.3125 | Synergism | |
| PP + FjLfEx | 6.25 | 50 | 3.125 | 6.25 | 0.5 | 0.125 | 0.625 | Additive | |
| L. monocytogenes | PP + Lav | 25 | 25 | 6.25 | 6.25 | 0.25 | 0.25 | 0.5 | Synergism |
| PP + Thyme | 25 | 25 | 3.125 | 3.125 | 0.125 | 0.125 | 0.25 | Synergism | |
| PP + FjPl EO | 25 | 6.25 | 12.5 | 3.125 | 0.5 | 0.5 | 1 | Additive | |
| PP + FjLfEO | 25 | 3.125 | 3.125 | 3.125 | 0.125 | 1 | 1.125 | Indifferent/no interaction | |
| PP + FjPlEx | 25 | 12.5 | 3.125 | 3.125 | 0.125 | 0.25 | 0.375 | Synergism | |
| PP + FjLfEx | 25 | 25 | 12.5 | 12.5 | 0.5 | 0.5 | 1 | Additive |
Abbreviations: FjLfEO, Feijoa leaf essential oil; FjLfEx, Feijoa leaf extract.; FjPlEO, Feijoa peel essential oil; FjPlEx, Feijoa peel extract; Lav, Lavender; PP, Peppermint.