Table 4.
Zone of growth inhibition (mean ± SD, mm), MICs and MBCs (mg/mL) caused by the three essential oils and by the standard antibiotics.
| Species | Code | Essential Oils | Antibiotics | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L. nobilis | Z. officinale | A. graveolens | ||||||||||
| ZI ± SD | MIC | MBC | ZI ± SD | MIC | MBC | ZI ± SD | MIC | MBC | 1 | 2 | ||
| A. hydrophila | R4 | 12.33 ± 0.58 hi | 0.05 | >12.5 | 8.67 ± 0.58 ij | 0.05 | >12.5 | 11.33 ± 0.58 ghi | 0.05 | 50 | 8 | 6 |
| A. hydrophila | R47 | 20 ± 1 b | 0.05 | 25 | 13.67 ± 0.58 cd | 0.05 | >0.78 | 15.33 ± 0.58 d | 0.05 | >25 | 15 | 7 |
| A. hydrophila | R48 | 22.33 ± 0.58 a | 0.10 | 50 | 14.33 ± 0.58 bc | 0.20 | 12.5 | 11.67 ± 0.58 gh | 0.10 | 50 | 10 | 6 |
| A. hydrophila | R71 | 16.67 ± 0.58 c | 0.20 | >25 | 13.67 ± 0.58 cd | 0.05 | >25 | 13 ± 1 ef | 0.20 | >12.5 | 15 | 6 |
| A. hydrophila | R29 | 14.33 ± 0.58 efg | 0.10 | >6.25 | 12.33 ± 0.58 efg | 0.10 | >25 | 13 ± 0 ef | 0.10 | 50 | 6 | 20 |
| A. hydrophila | R5 | 20.67 ± 0.58 b | 0.10 | 12.5 | 12.67 ± 0.58 ef | 0.10 | 12.5 | 25.33 ± 0.58 a | 0.10 | 50 | 11 | 8 |
| A. hydrophila | R13 | 11.33 ± 0.58 j | 0.10 | >12.5 | 7 ± 0 k | 0.05 | >25 | 6 ± 0 l | 0.10 | >12 | 13 | 6 |
| A. hydrophila | R3 | 15.33 ± 0.58 d | 0.10 | >25 | 15.33 ± 0.58 a | 0.10 | >12.5 | 13.33 ± 0.58 e | 0.10 | >12.5 | 19 | 6 |
| A. hydrophila | R46 | 14.33 ± 0.58 def | 0.10 | 25 | 14.33 ± 0.58 bc | 0.05 | >25 | 12.33 ± 0.58 efg | 0.10 | >12.5 | 11 | 7 |
| A. hydrophila | R22 | 11.67 ± 0.58 ij | 0.05 | 6.25 | 8.67 ± 0.58 ij | 0.05 | 12.5 | 7.33 ± 0.58 k | 0.10 | >12.5 | 11 | 6 |
| A. hydrophila | R14 | 13.67 ± 0.58 g | 0.05 | >6.25 | 10.33 ± 0.58 h | 0.05 | >25 | 8.67 ± 0.58 j | 0.05 | >25 | 14 | 6 |
| A. hydrophila | R70 | 11.67 ± 0.58 ij | 0.20 | >25 | 11.67 ± 0.58 fg | 0.10 | 50 | 11.33 ± 0.58 ghi | 0.05 | >12.5 | 7 | 6 |
| A. hydrophila | R11 | 14.67 ± 0.58 de | 0.10 | >25 | 12.67 ± 0.58 ef | 0.05 | >6.25 | 14.67 ± 0.58 d | 0.05 | >12.5 | 10 | 7 |
| A. hydrophila | R55 | 12 ± 1 ij | 0.05 | 12.5 | 12.00 ± 0 fg | 0.05 | >3.13 | 12 ± 1 fgh | 0.10 | 12.5 | 10 | 6 |
| A. hydrophila | R18 | 13.67 ± 0.58 efg | 0.05 | 12.5 | 12.67 ± 0.58 ef | 0.05 | 50 | 11 ± 0 hi | 0.05 | >25 | 11 | 7 |
| A. hydrophila | R23 | 14.67 ± 0.58 de | 0.05 | >6.25 | 12.33 ± 0.58 efg | 0.05 | 50 | 13 ± 0 ef | 0.10 | >25 | 12 | 6 |
| A. hydrophila | R44 | 13.33 ± 0.58 fg | 0.10 | >25 | 6 ± 0 l | 0.05 | 50 | 6 ± 0 l | 0.05 | >12.5 | 12 | 6 |
| A. hydrophila | R72 | 15.33 ± 0.58 d | 0.05 | 12.5 | 12.33 ± 0.58 efg | 0.05 | >0.78 | 12.33 ± 0.58 efg | 0.05 | >25 | 11 | 6 |
| E. cloacae | R68 | 10.33 ± 0.58 k | 0.20 | >25 | 9 ± 0 i | 0.05 | >25 | 11.67 ± 0.58 gh | 0.05 | >25 | 8 | 8 |
| E. cloacae | R16 | 11.67 ± 0.58 ij | 0.05 | >50 | 8 ± 0 j | 0.10 | >25 | 7.67 ± 0.58 k | 0.10 | 50 | 12 | 7 |
| K. ornithinolytica | R9 | 17 ± 0 c | 0.05 | 6.25 | 11.33 ± 0.58 g | 0.20 | >25 | 8.67 ± 0.58 j | 0.05 | >25 | 15 | 7 |
| K. oxytoca | R58 | 14.67 ± 0.58 de | 0.05 | >12.5 | 13 ± 0 de | 0.05 | >12.5 | 12 ± 0 fgh | 0.10 | 50 | 10 | 11 |
| S. lentus | R30 | 6 ± 0 l | 0.05 | >6.25 | 6 ± 0 l | 0.05 | >3.13 | 11.33 ± 0.58 ghi | 0.05 | >25 | 22 | 6 |
| S. lugdunensis | R1 | 14.33 ± 0.58 def | 0.10 | >25 | 10.33 ± 0.58 h | 0.05 | >12.5 | 10.33 ± 0.58 i | 0.10 | >25 | 19 | 6 |
| S. lugdunensis | R32 | 15.33 ± 0.58 d | 0.05 | >12.5 | 14.67 ± 0.58 ab | 0.20 | >12.5 | 17.67 ± 0.58 c | 0.39 | 50 | 22 | 20 |
| S. odorifera | R69 | 14.33 ± 0.58 def | 0.10 | >12.5 | 11.33 ± 0.58 g | 0.05 | >12.5 | 11.33 ± 0.58 ghi | 0.10 | >12.5 | 8 | 7 |
| S. sciuri | R40 | 14.67 ± 0.58 de | 0.05 | >25 | 11.33 ± 0.58 g | 0.10 | >25 | 11.33 ± 0.58 ghi | 0.10 | 50 | 15 | 7 |
| S. sciuri | R35 | 14.67 ± 0.58 de | 0.05 | >25 | 11.67 ± 0.58 fg | 0.05 | >25 | 13.33 ± 0.58 e | 0.10 | >25 | 24 | 6 |
| S. sciuri | R36 | 14.33 ± 0.58 def | 0.05 | >6.25 | 12.33 ± 0.58 efg | 0.20 | >6.25 | 14.67 ± 0.58 d | 0.05 | >25 | 10 | 13 |
| S. sciuri | R37 | 14.67 ± 0.58 de | 0.05 | >25 | 8.67 ± 0.58 ij | 0.05 | >6.25 | 11.67 ± 0.58 gh | 0.10 | >25 | 7 | 15 |
| S. sciuri | R2 | 14 ± 1 ef | 0.05 | >12.5 | 11.67 ± 0.58 fg | 0.10 | >12.5 | 11.67 ± 0.58 gh | 0.10 | 50 | 8 | 20 |
| S. sciuri | R53 | 14.67 ± 0.58 de | 0.05 | 12.5 | 13.67 ± 0.58 cd | 0.05 | 1.56 | 20 ± 1 b | 0.05 | >12.5 | 10 | 7 |
| S. xylosus | R64 | 14.33 ± 0.58 def | 0.05 | >6.25 | 12.33 ± 0.58 efg | 0.05 | >12.5 | 15.33 ± 0.58 d | 0.10 | >12.5 | 12 | 8 |
| V. alginolyticus | R63 | 13 ± 0 gh | 0.05 | >6.25 | 10.33 ± 0.58 h | 0.05 | >25 | 12.33 ± 0.58 efg | 0.10 | 50 | 8 | 7 |
MIC: Minimum Inhibitory Concentration (mg/mL). MBC: Minimum Bactericidal Concentration (mg/mL). IZ: Inhibition zone in diameter (mm ± SD) around the discs impregnated with 10 mg/disk of essential oil including disc diameter. SD: standard deviation; (a–l): Means followed by the same letters are not significantly different at p = 0.05 based on Duncan’s multiple range tests. 1: Erythromycin (15 µg). 2: Kanamycin (30 µg).