Table 3.
Evolution of the microbiological profile (log10 cfu/g; x ±SD) of MAP NS-Ricotta Cheese by smoking time during storage at 7°C.
| Microbial group | Smoking | Day of storage | |||
|---|---|---|---|---|---|
| T0 | T15 | T30 | T45 | ||
| Aerobic mesophilic bacteria | H1 | (n = 6/6) 4.04±0.23a1 | (n = 6/6) 2.79±0.31b1 | (n = 6/6) 3.62±1.05ab1 | (n = 6/6) 3.48±0.82ab1 |
| H2 | (n = 6/6) 3.56±0.75a1 | (n = 6/6) 2.70±0.61a1 | (n = 6/6) 2.75±0.83a1 | (n = 6/6) 3.04±1.23a1 | |
| H3 | (n = 6/6) 4.03±0.15a1 | (n = 6/6) 2.57±0.54b1 | (n = 6/6) 2.94±0.82b1 | (n = 6/6) 3.63±1.46ab1 | |
| Enterobacteriaceae | H1 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 1/6) 2.00±0.0 | (n = 2/6) 2.87±0.04 |
| H2 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | |
| H3 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | |
| E. coli | H1 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. |
| H2 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | |
| H3 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | |
| Yeast | H1 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 3/6) 2.73±0.60a | (n = 3/6) 2.89±0.11a |
| H2 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 1/6) 3.17±0.00a | (n = 0/6) N.D. | |
| H3 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 2/6) 2.60±0.43a | (n = 4/6) 3.16±1.09a | |
| Molds | H1 | (n = 0/6) N.D. | (n = 1/6) 2.00±0.0a | (n = 3/6) 2.10±0.17a | (n = 2/6) 2.30±0.43a |
| H2 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 1/6) 2.00±0.00a | (n = 0/6) N.D. | |
| H3 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 2/6) 2.45±0.64a | (n = 0/6) N.D. | |
| Pseudomonas spp | H1 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 1/6) 3.36±0.0 |
| H2 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | |
| H3 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | |
| Bacillus cereus | H1 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. |
| H2 | (n = 1/6) 2.60±0.00a | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | |
| H3 | (n = 0/6) N.D. | (n = 1/6) 2.00±0.00a | (n = 1/6) 2.47±0.00a | (n = 0/6) N.D. | |
| Listeria monocytogenes | H1 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. |
| H2 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | |
| H3 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | |
T0= day of packaging; T15, T30 and T45 = respectively, 15, 30 and 45 days of storage; H1, H2 and H3 indicate the smoking time respectively of 1, 2 and 3 hours; means in the same row with different superscript letter indicate a significant difference (P<0.05) among days of storage; for each microbial group means in the same column with different superscript number indicate a significant difference (P<0.05) among smoking time. Values within brackets indicate the prevalence of positive samples.