Table 4.
Antibacterial activity of neem oil (NO) against forty-eight Escherichia coli isolates revealed as growth inhibition zone (mm).
| E. coli isolates | Growth inhibition zone (mm)* | |||
|---|---|---|---|---|
| NSO (100 µL ) | TWN (100 µL) | WTR (100 µL) | CFX (100 µL) | |
| (1) FLC 1056 | 11.33 ± 0.58 b | — | — | 30.41 ± 0.20 a |
| (2) FLC 1247 | 16.13 ± 1.15 b | — | — | 30.52 ± 1.07 a |
| (3) FLC 1059 | 15.83 ± 1.13 b | — | — | 29.62 ± 1.00 a |
| (4) FLC 1243 | 19.00 ± 1.00 b | — | — | 31.53 ± 0.67 a |
| (5) FLC 1048 | 12.33 ± 0.58 b | — | — | 29.42 ± 0.58 a |
| (6) FLC 1167 | 9.50 ± 0.70 b | — | — | 30.61 ± 1.21 a |
| (7) FLC 1249 | 13.33 ± 0.58 b | — | — | 29.61 ± 1.11 a |
| (8) FLC 1055 | 14.53 ± 1.25 b | — | — | 31.75 ± 0.82 a |
| (9) FLC 1054 | 16.23 ± 1.18 b | — | — | 31.41 ± 0.76 a |
| (10) FLC 1085 | 18.00 ± 1.00 b | — | — | 30.53 ± 1.17 a |
| (11) FLC 1244 | 15.33 ± 0.48 b | — | — | 28.86 ± 1.00 a |
| (12) FLC 1165 | 19.50 ± 0.70 b | — | — | 31.33 ± 0.67 a |
| (13) FLC 1086 | 11.33 ± 0.58 b | — | — | 29.82 ± 0.48 a |
| (14) FLC 1053 | 14.53 ± 1.15 b | — | — | 32.65 ± 1.39 a |
| (15) FLC 1095 | 16.83 ± 1.18 b | — | — | 29.05 ± 1.22 a |
| (16) FLC 1219 | 10.70 ± 1.00 b | — | — | 32.75 ± 0.55 a |
| (17) FLC 1235 | 13.23 ± 0.88 b | — | — | 30.15 ± 0.55 a |
| (18) DSM8696 | 13.50 ± 0.50 b | — | — | 26.21 ± 1.00 a |
| (19) DSM9025 | 13.33 ± 0.58 b | — | — | 21.64 ± 0.94 a |
| (20) DSM10973 | 13.53 ± 1.25 b | — | — | 29.14 ± 1.75 a |
| (21) ATCC33559 | 13.83 ± 1.18 b | — | — | 32.12 ± 1.09 a |
| (22) CVVI E210 | 13.00 ± 1.00 a | — | — | 25.83 ± 1.65 a |
| (23) CVVI E173 | 12.23 ± 0.58 b | — | — | 32.35 ± 1.49 a |
| (24) CVVI E12b | 27.50 ± 0.50 b | — | — | 11.25 ± 0.68 a |
| (25) CVVI E16 | 14.33 ± 0.88 b | — | — | 27.54 ± 1.45 a |
| (26) CVVI E320 | 21.53 ± 1.35 b | — | — | 28.75 ± 1.86 a |
| (27) CVVI E130 | 11.83 ± 1.78 b | — | — | 29.64 ± 0.87 a |
| (28) CVVI E48 | 10.00 ± 1.40 a | — | — | 29.31 ± 0.27 a |
| (29) CVVI KH10 | 26.33 ± 0.53 b | — | — | 15.34 ± 0.66 a |
| (30) CVVI K10B | 27.50 ± 0.56 b | — | — | 0 |
| (31) CVVI E298 | 11.33 ± 0.48 b | — | — | 23.90 ± 1.69 a |
| (32) CVVI E273 | 13.53 ± 1.75 b | — | — | 29.59 ± 1.77 b |
| (33) CVVI K436 | 13.14 ± 1.68 b | — | — | 30.21 ± 1.38 a |
| (34) CVVI E98 | 11.00 ± 1.00 a | — | — | 26.91 ± 1.56 a |
| (35) CVVI E77 | 14.33 ± 0.58 b | — | — | 23.93 ± 0.59 a |
| (36) CVVI E148 | 13.50 ± 0.50 b | — | — | 28.71 ± 0.87 a |
| (37) CVVI E10 | 24.33 ± 0.58 b | — | — | 10.35 ± 1.11 a |
| (38) CVVI E215 | 16.53 ± 1.15 b | — | — | 26.41 ± 1.40 a |
| (39) NLK99/F5 | 29.83 ± 1.18 b | — | — | 16, 21 ± 0.89 a |
| (40) NLP987/F5 | 30.00 ± 1.00 a | — | — | 13.21 ± 1.15 a |
| (41) NLK99-1* | 21.73 ± 1.35 b | — | — | 15.34 ± 1.37 a |
| (42) NLK99-3* | 28.33 ± 1.50 b | — | — | 0 |
| (43) NLK99-5* | 25.00 ± 1.10 a | — | — | 9.54 ± 1.11 a |
| (44) NLK99-7* | 26.33 ± 0.58 b | — | — | 14,25 ± 1.11 a |
| (45) NLK99-9* | 27.50 ± 0.50 b | — | — | 11.26 ± 1.78 a |
| (46) NLK99-11* | 29.53 ± 1.25 b | — | — | 16.24 ± 1.68 a |
| (47) NLK99-15* | 28.83 ± 1.38 b | — | — | 16.35 ± 1.11 a |
| (48) NLK99-19* | 25.00 ± 1.70 a | — | — | 15.53 ± 0.84 a |
Three paper discs per plate and three plates for each bacterium were considered. The experiment was repeated twice. Values are given as mean ± S.D. Values in a row followed by different lowercased letters are significantly different at P ≤ 0.05.