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.

From: Impact of thermal treatment on the quality, total antioxidant and antibacterial properties of fermented camel milk

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

  1. Data are presented as mean values ± standard deviation. Means with different small letters at the same day of storage in the column are significantly different at P < 0.05, means with different capital letters within the same treatment in the column are significantly different at P < 0.05. * Codex 243:201037; Egyptian standards 8042:201638; NA: Not applicable.