Table 2 Effect of thermal treatment of camel milk on the pH, titratable acidity and microbial quality of fermented milk during 14 days of storage.
Thermal treatment | Storage time (day) | pH | Titratable acidity (%) | Count (log CFU/g) | ||||
|---|---|---|---|---|---|---|---|---|
Coliform | E. coli | Coagulase-positive S. aureus | Yeasts and Molds | Lactic acid bacteria | ||||
Raw | 1 | 4.47 | 0.633 ± 0.01aB | 4.26 ± 0.24aA | < 1 | 4.56 ± 0.24aA | 3.26 ± 0.24aA | 7.83 ± 0.04bA |
7 | 4.46 | 0.621 ± 0.01eB | 3.26 ± 0.24aB | < 1 | 3.60 ± 0.00aB | 2.95 ± 0.09aA | 7.26 ± 0.24cB | |
14 | 4.45 | 0.651 ± 0.01dA | 2.74 ± 0.24aC | < 1 | < 1 | 3.36 ± 0.32aA | 7.08 ± 0.19bB | |
63 °C/30 min | 1 | 4.62 | 0.579 ± 0.01cC | < 1 | < 1 | < 1 | < 1 | 7.69 ± 0.09cB |
7 | 4.58 | 0.612 ± 0.00fB | < 1 | < 1 | < 1 | < 1 | 8.56 ± 0.24aA | |
14 | 4.44 | 0.651 ± 0.01dA | < 1 | < 1 | < 1 | < 1 | 8.48 ± 0.44aA | |
72 °C/15 s | 1 | 4.43 | 0.633 ± 0.00aB | < 1 | < 1 | < 1 | < 1 | 7.90 ± 0.05abB |
7 | 4.42 | 0.645 ± 0.01cAB | < 1 | < 1 | < 1 | < 1 | 8.46 ± 0.15abA | |
14 | 4.42 | 0.657 ± 0.01dA | < 1 | < 1 | < 1 | < 1 | 8.39 ± 0.36aA | |
85 °C/15 s | 1 | 4.40 | 0.609 ± 0.01bC | < 1 | < 1 | < 1 | < 1 | 7.98 ± 0.03aA |
7 | 4.40 | 0.630 ± 0.00dB | < 1 | < 1 | < 1 | < 1 | 8.39 ± 0.36abA | |
14 | 4.39 | 0.672 ± 0.01cA | < 1 | < 1 | < 1 | < 1 | 8.39 ± 0.36aA | |
85 °C/30 min | 1 | 4.52 | 0.576 ± 0.01cB | < 1 | < 1 | < 1 | < 1 | 7.93 ± 0.08aA |
7 | 4.52 | 0.585 ± 0.00gB | < 1 | < 1 | < 1 | < 1 | 8.08 ± 0.19bA | |
14 | 4.41 | 0.681 ± 0.01cA | < 1 | < 1 | < 1 | < 1 | 8.00 ± 0.00aA | |
90 °C/15 s | 1 | 4.48 | 0.572 ± 0.01cB | < 1 | < 1 | < 1 | < 1 | 7.95 ± 0.05aA |
7 | 4.24 | 0.720 ± 0.00aA | < 1 | < 1 | < 1 | < 1 | 7.08 ± 0.19cB | |
14 | 4.24 | 0.714 ± 0.01bA | < 1 | < 1 | < 1 | < 1 | 6.98 ± 0.03bB | |
90 °C/30 min | 1 | 4.35 | 0.609 ± 0.01bC | < 1 | < 1 | < 1 | < 1 | 6.98 ± 0.03dB |
7 | 4.22 | 0.684 ± 0.00bB | < 1 | < 1 | < 1 | < 1 | 7.26 ± 0.24cAB | |
14 | 4.22 | 0.732 ± 0.01aA | < 1 | < 1 | < 1 | < 1 | 7.46 ± 0.15bA | |
Guideline | ≤ 1* | Free | Free /10 g | NA | ≥ 6 | |||