Table 2.
Evolution of the microbiological profile (log10 cfu/g; x ±SD) of MAP NS-Ricotta Cheese by smoking time during storage at 4°C.
| Microbial group | Smoking | Day of storage | |||
|---|---|---|---|---|---|
| T0 | T15 | T30 | T45 | ||
| Aerobic mesophilic bacteria | H1 | (n = 6/6) 4.05±0.23a1 | (n = 6/6) 2.82±0.36c1 | (n = 6/6) 3.15±0.83bc1 | (n = 6/6) 3.78±1.09ab1 |
| H2 | (n = 6/6) 3.56±0.74a1 | (n = 6/6) 2.76±0.51ab1 | (n = 6/6) 2.69±0.96ab1 | (n = 6/6) 2.68±0.61b1 | |
| H3 | (n = 6/6) 4.04±0.15a1 | (n = 6/6) 2.32±0.32b1 | (n = 6/6) 2.76±0.74b1 | (n = 6/6) 2.88±0.51b1 | |
| Enterobacteriaceae | H1 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 1/6) 2.77±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. | |
| 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 = 1/6) 1.30±0.0a | (n = 3/6) 2.78±0.68a | (n = 1/6) 3.08±0.0a |
| H2 | (n = 0/6) N.D. | (n = 1/6) 1.60±0.0a | (n = 1/6) 2.00±0.0a | (n = 0/6) N.D. | |
| H3 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 1/6) 3.08±0.0a | (n = 2/6) 3.04±0.19a | |
| Molds | H1 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 3/6) 2.26±0.24a | (n = 1/6) 3.00±0.0a |
| H2 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 1/6) 2.48±0.0a | (n = 0/6) N.D. | |
| H3 | (n = 0/6) N.D. | (n = 0/6) N.D. | (n = 2/6) 2.65±0.49a | (n = 1/6) 2.47±0.0a | |
| Pseudomonas spp | 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. | |
| Bacillus cereus | H1 | (n = 0/6) N.D. | (n = 1/6) 2.84±0.0a | (n = 1/6) 2.00±0.0a | (n = 0/6) N.D. |
| H2 | (n = 1/6) 2.60±0.0a | (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±0.0a | (n = 0/6) N.D. | (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.