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Table 1 Trials and variables levels in the Plackett–Burman experimental design and the resulted LA-EPS-20079 concentrations

From: Improvement and enhancement of oligosaccharide production from Lactobacillus acidophilus using statistical experimental designs and its inhibitory effect on colon cancer

Trial

pH

Incubation time (h)

Temperature (oC)

Glucose (g/l)

Peptone (g/l)

Beef extract (g/l)

Yeast extract (g/l)

K2HPO4 (g/l)

Triammonium citrate (g/l)

Sodium acetate trihydrate (g/l)

MgSO4.7H2O (g/l)

Tween-80 (ml/l)

Manganous sulfate tetrahydrate (g/l)

LA-EPS-20079 concentration (μg/ml)

1

+ 1 (6.5)

+ 1 (48)

+ 1 (37)

+ 1 (20)

+ 1 (10)

+ 1 (10)

+ 1 (5)

+ 1 (2)

-1 (0.2)

-1 (0.5)

-1 (0.2)

-1 (0.1)

-1 (0.05)

417.02

2

+ 1 (6.5)

+ 1 (48)

+ 1 (37)

+ 1 (20)

+ 1 (10)

+ 1 (10)

+ 1 (5)

-1 (0.2)

-1 (0.2)

-1 (0.5)

-1 (0.2)

-1 (0.1)

-1 (0.05)

459.64

3

+ 1 (6.5)

+ 1 (48)

+ 1 (37)

+ 1 (20)

+ 1 (10)

+ 1 (10)

-1 (0.5)

-1 (0.2)

-1 (0.2)

-1 (0.5)

-1 (0.2)

-1 (0.1)

-1 (0.05)

376.79

4

+ 1 (6.5)

+ 1 (48)

+ 1 (37)

+ 1 (20)

+ 1 (10)

-1 (1)

-1 (0.5)

-1 (0.2)

-1 (0.2)

-1 (0.5)

-1 (0.2)

-1 (0.1)

+ 1 (0.1)

325.83

5

+ 1 (6.5)

+ 1 (48)

+ 1 (37)

+ 1 (20)

-1 (1)

-1 (1)

-1 (0.5)

-1 (0.2)

-1 (0.2)

-1 (0.5)

-1 (0.2)

+ 1 (1)

+ 1 (0.1)

183.21

6

+ 1 (6.5)

+ 1 (48)

+ 1 (37)

-1 (2)

-1 (1)

-1 (1)

-1 (0.5)

-1 (0.2)

-1 (0.2)

-1 (0.5)

+ 1 (2)

+ 1 (1)

+ 1 (0.1)

32.74

7

+ 1 (6.5)

+ 1 (48)

-1 (30)

-1 (2)

-1 (1)

-1 (1)

-1 (0.5)

-1 (0.2)

-1 (0.2)

+ 1 (5)

+ 1 (2)

+ 1 (1)

+ 1 (0.1)

128.45

8

+ 1 (6.5)

-1 (24)

-1 (30)

-1 (2)

-1 (1)

-1 (1)

-1 (0.5)

-1 (0.2)

+ 1 (2)

+ 1 (5)

+ 1 (2)

+ 1 (1)

+ 1 (0.1)

1.55

9

-1 (6)

-1 (24)

-1 (30)

-1 (2)

-1 (1)

-1 (1)

-1 (0.5)

+ 1 (2)

+ 1 (2)

+ 1 (5)

+ 1 (2)

+ 1 (1)

+ 1 (0.1)

3.45

10

-1 (6)

-1 (24)

-1 (30)

-1 (2)

-1 (1)

-1 (1)

+ 1 (5)

+ 1 (2)

+ 1 (2)

+ 1 (5)

+ 1 (2)

+ 1 (1)

+ 1 (0.1)

112.97

11

-1 (6)

-1 (24)

-1 (30)

-1 (2)

-1 (1)

+ 1 (10)

+ 1 (5)

+ 1 (2)

+ 1 (2)

+ 1 (5)

+ 1 (2)

+ 1 (1)

+ 1 (0.1)

137.27

12

-1 (6)

-1 (24)

-1 (30)

-1 (2)

+ 1 (10)

+ 1 (10)

+ 1 (5)

+ 1 (2)

+ 1 (2)

+ 1 (5)

+ 1 (2)

+ 1 (1)

-1 (0.05)

13.45

13

-1 (6)

-1 (24)

-1 (30)

+ 1 (20)

+ 1 (10)

+ 1 (10)

+ 1 (5)

+ 1 (2)

+ 1 (2)

+ 1 (5)

+ 1 (2)

-1 (0.1)

-1 (0.05)

419.88

14

-1 (6)

-1 (24)

+ 1 (37)

+ 1 (20)

+ 1 (10)

+ 1 (10)

+ 1 (5)

+ 1 (2)

+ 1 (2)

+ 1 (5)

-1 (0.2)

-1 (0.1)

-1 (0.05)

399.17

15

-1 (6)

+ 1 (48)

+ 1 (37)

+ 1 (20)

+ 1 (10)

+ 1 (10)

+ 1 (5)

+ 1 (2)

+ 1 (2)

-1 (0.5)

-1 (0.2)

-1 (0.1)

-1 (0.05)

379.17

16

-1 (6)

-1 (24)

-1 (30)

-1 (2)

-1 (1)

-1 (1)

-1 (0.5)

-1 (0.2)

-1 (0.2)

-1 (0.5)

-1 (0.2)

-1 (0.1)

-1 (0.05)

239.41