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Table 2 Effect of pH 2, 3, and 4 on the viability of Lactobacillus and Bifidobacterium strains

From: Probiotic properties of bifidobacteria and lactobacilli isolated from local dairy products

Straina

pHb

Viable count (log CFU/mL)c at different time (h)

Log reduction

0

30

60

90

120

150

180

Lactobacillus acidophilus FTDC 8633 A

2 c

10.09 ± 0.01

10.08 ± 0.08

9.77 ± 0.07

9.68 ± 0.02

9.18 ± 0.26

9.13 ± 0.06

9.11 ± 0.42

0.98 ± 0.41

3 b

9.67 ± 0.25

9.64 ± 0.05

9.59 ± 0.18

9.56 ± 0.05

9.55 ± 0.04

9.43 ± 0.03

9.43 ± 0.15

0.24 ± 0.10

4 a

9.49 ± 0.18

9.35 ± 0.29

9.35 ± 0.08

9.29 ± 0.20

9.27 ± 0.48

9.19 ± 0.17

9.15 ± 0.15

0.34 ± 0.04

Lactobacillus delbrueckii subsp. bulgaricus FTDC 8011 A,B

2 c

10.07 ± 0.09

9.42 ± 0.02

9.42 ± 0.01

9.42 ± 0.01

9.38 ± 0.03

9.37 ± 0.00

9.34 ± 0.07

0.73 ± 0.15

3 b

9.13 ± 0.08

9.10 ± 0.12

9.04 ± 0.12

9.03 ± 0.12

8.99 ± 0.42

8.99 ± 0.19

8.96 ± 0.07

0.17 ± 0.00

4 a

9.49 ± 0.17

9.29 ± 0.15

9.16 ± 0.36

9.06 ± 0.49

9.00 ± 0.07

8.90 ± 0.15

8.84 ± 0.15

0.65 ± 0.02

Lactobacillus acidophilus FTDC 2131 A,B

2 c

9.98 ± 0.10

9.45 ± 0.02

9.45 ± 0.04

9.42 ± 0.01

9.41 ± 0.01

9.35 ± 0.06

9.27 ± 0.00

0.71 ± 0.08

3 b

9.38 ± 0.90

9.32 ± 0.47

9.27 ± 0.77

9.26 ± 0.66

9.25 ± 0.70

9.16 ± 0.59

9.14 ± 0.82

0.24 ± 0.08

4 a

9.40 ± 0.13

9.38 ± 0.49

9.32 ± 0.08

9.30 ± 0.57

9.30 ± 0.28

9.19 ± 0.09

9.13 ± 0.01

0.27 ± 0.14

Lactobacillus acidophilus BT 1088 A,B

2 c

10.59 ± 0.23

9.97 ± 0.26

9.76 ± 0.38

9.04 ± 0.08

8.85 ± 0.62

8.85 ± 0.62

8.76 ± 0.08

1.83 ± 0.16

3 b

9.36 ± 0.27

9.27 ± 0.26

9.20 ± 0.41

9.19 ± 0.46

9.19 ± 0.73

9.15 ± 0.28

9.13 ± 0.07

0.23 ± 0.20

4 a

9.56 ± 0.19

9.54 ± 0.02

9.54 ± 0.06

9.50 ± 0.04

9.47 ± 0.14

9.45 ± 0.22

9.34 ± 0.24

0.22 ± 0.05

Lactobacillus acidophilus FTCC 0291 A,B

2 c

10.03 ± 0.56

9.60 ± 0.05

9.59 ± 0.38

9.57 ± 0.45

9.50 ± 0.02

9.36 ± 0.12

9.24 ± 0.71

0.79 ± 0.15

3 b

9.65 ± 0.20

9.61 ± 0.19

9.58 ± 0.01

9.53 ± 0.17

9.50 ± 0.09

9.47 ± 0.02

9.46 ± 0.13

0.19 ± 0.07

4 a

9.82 ± 0.24

9.79 ± 0.21

9.73 ± 0.09

9.64 ± 0.04

9.58 ± 0.04

9.57 ± 0.16

9.51 ± 0.04

0.31 ± 0.20

Lactobacillus casei BT 1268 B,C

2 c

10.27 ± 0.07

9.32 ± 0.60

9.29 ± 0.49

9.27 ± 0.41

9.22 ± 0.44

9.12 ± 0.24

6.85 ± 0.21

3.42 ± 0.28

3 b

9.30 ± 0.25

9.27 ± 0.04

9.24 ± 0.30

9.14 ± 0.26

9.10 ± 0.32

9.09 ± 0.07

9.06 ± 0.14

0.24 ± 0.12

4 a

9.50 ± 0.22

9.50 ± 0.27

9.50 ± 0.27

9.43 ± 0.29

9.36 ± 0.11

9.20 ± 0.26

9.12 ± 0.12

0.38 ± 0.34

Bifidobacterium longum FTDC 8643 F

2 c

9.14 ± 0.40

8.00 ± 0.64

6.51 ± 0.05

ND

ND

ND

ND

9.14 ± 0.35

3 b

7.64 ± 0.08

7.63 ± 0.29

7.38 ± 0.03

7.31 ± 0.07

7.27 ± 0.01

7.26 ± 0.01

7.24 ± 0.01

0.40 ± 0.09

4 a

8.26 ± 0.02

8.23 ± 0.00

8.09 ± 0.19

8.04 ± 0.15

7.92 ± 0.12

7.98 ± 0.22

7.88 ± 0.04

0.38 ± 0.02

Lactobacillus acidophilus FTDC 8933 D

2 c

10.11 ± 0.33

8.85 ± 0.48

8.10 ± 0.11

7.89 ± 0.21

8.72 ± 0.48

7.71 ± 0.15

7.00 ± 0.00

3.11 ± 0.33

3 b

9.18 ± 0.15

8.87 ± 0.37

8.77 ± 0.90

8.58 ± 0.34

8.52 ± 0.32

8.52 ± 0.63

8.47 ± 0.25

0.71 ± 0.40

4 a

9.69 ± 0.23

9.65 ± 0.32

9.61 ± 0.26

9.59 ± 0.19

9.58 ± 0.26

9.58 ± 0.27

9.54 ± 0.52

0.15 ± 0.30

Lactobacillus delbrueckii subsp. bulgaricus FTDC 8611 G

2 c

10.21 ± 0.18

9.27 ± 0.09

ND

ND

ND

ND

ND

10.21 ± 0.28

3 b

8.86 ± 0.62

8.76 ± 0.66

8.75 ± 0.81

8.73 ± 0.61

8.70 ± 0.45

8.66 ± 0.48

8.64 ± 0.23

0.22 ± 0.40

4 a

9.43 ± 0.21

9.42 ± 0.15

9.28 ± 0.09

9.26 ± 0.55

9.25 ± 0.41

9.22 ± 0.08

9.19 ± 0.33

0.24 ± 0.11

Lactobacillus gasserii FTDC 8131 C,D

2 c

9.82 ± 0.30

9.66 ± 0.41

9.17 ± 0.06

8.57 ± 0.31

7.99 ± 0.26

7.52 ± 0.31

7.51 ± 0.05

2.31 ± 0.26

3 b

9.35 ± 0.38

9.31 ± 0.10

9.31 ± 0.10

9.27 ± 0.11

9.26 ± 0.18

9.25 ± 0.02

9.16 ± 0.13

0.19 ± 0.25

4 a

9.61 ± 0.21

9.60 ± 0.19

9.56 ± 0.19

9.53 ± 0.09

9.51 ± 0.20

9.46 ± 0.25

9.28 ± 0.24

0.33 ± 0.45

Lactobacillus fermentum BT 8219 C,D

2 c

10.10 ± 0.07

8.72 ± 0.01

8.74 ± 0.19

8.62 ± 0.44

8.43 ± 0.11

8.38 ± 0.18

8.23 ± 0.04

1.87 ± 0.11

3 b

10.05 ± 0.11

10.02 ± 0.05

10.01 ± 0.03

9.87 ± 0.04

9.85 ± 0.24

9.76 ± 0.39

9.59 ± 0.03

0.46 ± 0.13

4 a

9.67 ± 0.23

9.65 ± 0.32

9.62 ± 0.27

9.55 ± 0.07

9.50 ± 0.15

9.50 ± 0.18

9.22 ± 0.17

0.45 ± 0.06

Bifidobacterium spp. FTDC 8943 E

2 c

8.71 ± 0.04

7.87 ± 0.069

6.26 ± 0.00

6.17 ± 0.10

6.15 ± 0.28

6.14 ± 0.14

6.07 ± 0.10

2.64 ± 0.16

3 b

8.20 ± 0.19

7.64 ± 0.03

7.41 ± 0.04

7.37 ± 0.56

7.35 ± 0.02

7.29 ± 0.01

7.27 ± 0.10

0.93 ± 0.29

4 a

8.30 ± 0.09

8.05 ± 0.00

8.02 ± 0.05

7.98 ± 0.16

7.96 ± 0.18

7.95 ± 0.17

7.92 ± 0.04

0.38 ± 0.04

Lactobacillus delbrueckii subsp. bulgaricus FTDC 8913 C,D

2 c

10.44 ± 0.03

9.93 ± 0.06

9.05 ± 0.11

8.54 ± 0.09

8.12 ± 0.60

8.00 ± 0.43

7.70 ± 0.00

2.74 ± 0.04

3 b

9.68 ± 0.02

9.43 ± 0.30

9.30 ± 0.34

9.24 ± 0.58

9.09 ± 0.28

9.03 ± 0.40

9.02 ± 0.25

0.66 ± 0.23

4 a

9.39 ± 0.43

9.32 ± 0.38

9.30 ± 0.06

9.30 ± 0.34

9.20 ± 0.42

9.20 ± 0.00

9.17 ± 0.19

0.22 ± 0.62

Lactobacillus acidophilus FTDC 8033 D

2 c

10.36 ± 0.34

10.22 ± 0.07

8.50 ± 0.14

7.85 ± 0.22

7.70 ± 0.00

7.09 ± 0.12

6.94 ± 0.34

3.42 ± 0.00

3 b

9.14 ± 0.11

9.19 ± 0.32

9.16 ± 0.48

9.08 ± 0.31

9.03 ± 0.22

9.01 ± 0.14

8.96 ± 0.20

0.18 ± 0.12

4 a

9.66 ± 0.27

9.55 ± 0.03

9.50 ± 0.35

9.45 ± 0.19

9.45 ± 0.01

9.34 ± 0.29

9.33 ± 0.26

0.33 ± 0.01

  1. Statistical significance effect: Effects of time: P < 0.001. Effects of strains: P < 0.001. Effects of strains × time: P < 0.001
  2. aMeans between different strains followed by different uppercase letters are significantly different at P < 0.05
  3. bMeans between different pH within the same strain followed by different lowercase letters are significantly different at P < 0.05
  4. cResults are expressed as the mean ± standard deviation; Each data point is the average of two repeated measurements from 3 independent experiments (n = 3)
  5. ND, Not detected
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Annals of Microbiology

ISSN: 1869-2044

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