Table 2.
Microbial counts (log Cfu/g) in chicken drumsticks during storage days (at 4 ± 1 °C)
| Treatments | 0 | 3 | 6 | 9 | 12 | 16 | |
|---|---|---|---|---|---|---|---|
| Storage time (days) | |||||||
| Mesophilic bacteria | Control | 5.06 ± 0.10a | 6.56 ± 0.16a | 7.25 ± 0.08a | 7.42 ± 0.02a | 9.44 ± 0.10a | D** |
| CH | 3.05 ± 0.05b | 3.03 ± 0.08b | 2.60 ± 0.07b | 5.30 ± 0.70b | 5.60 ± 0.05b | 6.04 ± 0.1a | |
| CE | 2.51 ± 0.07c | 3.07 ± 0.14b | 2.47 ± .10b | 5.36 ± 0.09b | 5.68 ± 0.10b | 6.32 ± 0.04b | |
| CEO | 4.03 ± 0.02d | 5.13 ± 0.15c | 5.04 ± 0.03c | 6.34 ± 0.10c | 6.17 ± 0.05c | 6.30 ± 0.12b | |
| CM | 1.90 ± 0.11e | 2.91 ± 0.02b | 2.60 ± 0.05b | 5.41 ± 0.12b | 5.57 ± 0.13b | 6.01 ± 0.13c | |
| H2S producing bacteria | Control | 3.30 ± 0.08a | 4.10 ± 0.06a | 5.16 ± 0.12a | 5.55 ± 0.07a | 6.78 ± 0.06a | 7.91 ± 0.05a |
| CH | 2.24 ± 0.07b | 3.90 ± 0.04b | 4.17 ± 0.04b | 4.02 ± 0.03b | 5.20 ± 0.04b | 5.10 ± 0.11b | |
| CE | 1.52 ± 0.06c | 2.25 ± 0.03c | 2.39 ± 0.06c | 3.79 ± 0.05c | 4.30 ± 0.07c | 4.68 ± 0.04c | |
| CEO | 2.25 ± 0.06b | 3.90 ± 0.08b | 5.0 ± 0.08a | 5.47 ± 0.09a | 6.0 ± 0.11d | 5.90 ± 0.05d | |
| CM | 1.90 ± 0.09d | 2.30 ± 0.10c | 3.32 ± 0.06d | 4.30 ± 0.07a | 4.77 ± 0.06e | 5.14 ± 0.07b | |
| Enterobacteriaceae | Control | 3.11 ± 0.10a | 4.12 ± 0.07a | 6.52 ± 0.02a | 7.18 ± 0.05a | 7.35 ± 0.06a | 7.80 ± 0.05a |
| CH | 0.45 ± 0.05b | 0.69 ± 0.04b | 1.30 ± 0.18b | 3.86 ± 0.05b | 4.77 ± 0.13b | 4.87 ± 0.17b | |
| CE | 0.41 ± 0.03b | 0.69 ± 0.09b | 3.87 ± 0.06c | 3.74 ± 0.08b | 4.60 ± 0.12b | 4.78 ± 0.15b | |
| CEO | 1.21 ± 0.04c | 2.47 ± 0.07d | 3.87 ± 0.06c | 4.83 ± 0.10c | 4.83 ± 0.15b | 4.96 ± 0.18b | |
| CM | 1.05 ± 0.05c | 1.14 ± 0.09e | 2.03 ± 0.06d | 4.09 ± 0.07d | 4.30 ± 0.14c | 4.69 ± 0.13b | |
| Psychotropic bacteria | Control | 4.15 ± 0.08a | 6.69 ± 0.06a | 8.21 ± 0.12a | 8.74 ± 0.07a | 9.06 ± 0.06a | 9.24 ± 0.05a |
| CH | 4.0 ± 0.07a | 6.44 ± 0.04b | 6.17 ± 0.06b | 7.17 ± 0.03b | 7.14 ± 0.10b | 7.04 ± 0.06b | |
| CE | 3.24 ± 0.06b | 4.95 ± 0.11c | 6.01 ± 0.06c | 6.39 ± 0.05c | 6.60 ± 0.08c | 4.14 ± 0.04b | |
| CEO | 4.02 ± 0.16a | 6.38 ± 0.05b | 6.13 ± 0.08b | 6.77 ± 0.08d | 6.84 ± 0.04d | 7.11 ± 0.05b | |
| CM | 3.75 ± 0.09d | 5.70 ± 0.05d | 5.84 ± 0.08d | 6.55 ± 0.09e | 6.69 ± 0.06c | 7.95 ± 0.04c | |
| Lactic Acid bacteria | Control | 3.86 ± 0.05a | 5.16 ± 0.06a | 6.25 ± 0.08a | 6.42 ± 0.02a | 7.04 ± 0.07a | D** |
| CH | 2.55 ± 0.05b | 3.69 ± 0.05b | 2.60 ± 0.07b | 2.80 ± 0.07b | 3.32 ± 0.06b | 3.79 ± 0.10a | |
| CE | – | – | 0.39 ± 0.02c | 1.07 ± 0.08c | 2.47 ± 0.09c | 3.25 ± 0.04b | |
| CEO | 1.63 ± 0.02c | 2.60 ± 0.10c | 2.39 ± 0.03d | 3.13 ± 0.11d | 3.38 ± 0.05d | 3.60 ± 0.08a | |
| CM | – | – | – | 0.30 ± 0.02e | 1.57 ± 0.03e | 2.95 ± 0.03e | |
Treatment: Control, Uncoating; CH, Chitosan Coating; CE, Chitosan Coating with Extract; CEO, Chitosan Coating with EO; CM, Chitosan Coating with Extract and EO. *Different letters indicate significant difference (p < 0.05), **Discarded