Table 3.
Evaluation of microbiological counts (Log CFU/g) in Sarda sarda burgers packaged in active PP films functionalized with 1018K6 by storage time.
| Day | 0 | 3 | 5 | 7 | ||
|---|---|---|---|---|---|---|
| m ± sem | m ± sem | m ± sem | m ± sem | |||
| TAB 30 °C | CTR | 6.25 ± 0.02 a,A | 6.52 ± 0.17 A | 6.74 ± 0.17 b,A | 8.14 ± 0.08 X,B | |
| 1018K6-PP | 6.25 ± 0.02 | 6.17 ± 0.12 | 6.22 ± 0.22 | 6.37 ± 0.34 Y | ||
| TAB 7 °C | CTR | 5.16 ± 0.09 A | 6.36 ± 0.08 B | 6.79 ± 0.07 C,X | 8.17 ± 0.04 D,X | |
| 1018K6-PP | 5.16 ± 0.09 A | 6.01 ± 0.16 B | 5.94 ± 0.19 B,Y | 6.50 ± 0.39 B,Y | ||
| Coliforms | CTR | 4.61 ± 0.02 A | 5.39 ± 0.09 a,B,X | 4.90 ± 0.04 C | 5.15 ± 0.06 b,B,X | |
| 1018K6-PP | 4.61 ± 0.02 | 4.60 ± 0.23 Y | 4.62 ± 0.16 | 4.35 ± 0.25 Y | ||
| Enterobacteriaceae | CTR | 3.26 ± 0.17 A | 5.96 ± 0.57 B,C,X | 4.98 ± 0.10 B | 5.26 ± 0.00 C | |
| 1018K6-PP | 3.26 ± 0.17 A | 3.63 ± 0.46 a,A,Y | 4.97 ± 0.16 b,B | 5.11 ± 0.15 B | ||
| Pseudomonas spp. | CTR | 5.91 ± 0.02 a,A | 6.51 ± 0.20 bB,x | 5.79 ± 0.10 A,x | 8.59 ± 0.09 C,X | |
| 1018K6-PP | 5.91 ± 0.02 A | 5.91 ± 0.13 y | 5.47 ± 0.08 B,y | 6.44 ± 0.36 Y | ||
| E. coli | CTR | 1.50 ± 0.12 a | 1.80 ± 0.20 A | 1.62 ± 0.11 A | 1.11 ± 0.09 b,B | |
| 1018K6-PP | 1.50 ± 0.12 | 1.32 ± 0.18 | 1.19 ± 0.23 | 1.28 ± 0.16 | ||
| Enterococcus faecalis | CTR | 4.39 ± 0.13 A | 4.41 ± 0.09 A,X | 3.21 ± 0.23 B | 3.96 ± 0.00 C | |
| 1018K6-PP | 4.39 ± 0.13 a,A | 3.39 ± 0.13 B,Y | 3.81 ± 0.39 | 3.87 ± 0.21 b | ||
| B. thermosphacta | CTR | ni A | ni A | 1.98 ± 0.00 B,X | 1.98 ± 0.00 B,X | |
| 1018K6-PP | ni | ni | ni Y | ni Y | ||
| Staph. coagulase positive | CTR | 4.45 ± 0.01 A | 5.64 ± 0.08 B,X | 4.23 ± 0.14 A,X | 4.37 ± 0.26 A,X | |
| 1018K6-PP | 4.45 ± 0.01 A | 4.12 ± 0.16 a,A,Y | 3.6 ± 0.08 b,B,Y | 3.19 ± 0.22 B,Y | ||
| pH | CTR | 6.20 ± 0.01 A | 6.18 ± 0.00 A,x | 6.24 ± 0.01 B | 6.39 ± 0.03 C,X | |
| 1018K6-PP | 6.20 ± 0.01 a | 6.21 ± 0.01 y | 6.23 ± 0.00 b | 6.26 ± 0.03 b,Y | ||
| aw | CTR | 0.976 ± 0.006 | 0.969 ± 0.001 a | 0.972 ± 0.001 | 0.974 ± 0.001 b | |
| 1018K6-PP | 0.976 ± 0.006 | 0.963 ± 0.009 | 0.973 ± 0.000 | 0.974 ± 0.002 |
ni—not isolated. In each sampling day, three samples were analysed by experimental group. Statistical analysis was performed comparing experimental groups at each sampling time and within each experimental group along the ripening period. All data were presented as mean (m) ± standard error (sem). Different superscript uppercase letters indicate a significant difference at p < 0.01. Different superscript lowercase letters indicate a significant difference at p < 0.05. a–d In the same row mean values (same group in different days) followed by different letters show significant differences. x,y In the same column mean values (different groups on the same sampling time) followed by different letters show significant differences.