TABLE 3.
Antimicrobial activity of tested EOs and extracts against Escherichia coli, Salmonella enterica Typhimurium, Staphylococcus aureus, Bacillus cereus, and Listeria monocytogenes. The MBC values are presented in mg/mL.
| Bacterial pathogens | Feijoa peel | Feijoa leaf | Manuka | Kanuka | Peppermint | Thyme | Lavender | ||
|---|---|---|---|---|---|---|---|---|---|
| EO | EX | EO | EX | ||||||
| E. coli ATCC 25922 | 50 | 25 | 50 | 50 | 100 | 100 | 6.25 | 12.5 | 12.5 |
| S. enterica ATCC 10702 | 100 | 25 | 100 | 25 | 100 | 100 | 50 | 50 | 50 |
| St. aureus ATCC 6538 | 6.25 | 25 | 3.125 | 1.5 | 1.5 | 25 | 25 | 25 | 50 |
| B. cereus ATCC 11778 | 3.125 | 6.25 | 1.5 | 6.25 | 0.7 | 6.25 | 12.5 | 25 | 12.5 |
| L. monocytogenes CDC H2446 | 6.25 | 12.5 | 3.125 | 25 | 0.7 | 25 | 25 | 25 | 25 |
Note: All experiments were performed in triplicate and median values were recorded. The EOs and extracts contributed to the turbidity of medium, hence MIC was not recorded.
Abbreviations: EO, Essential oil; EX: Extract.