Table 1. Independent values, their coded and actual values for optimization condition of fermented milk by
Lactiplantibacillus plantarum
K79
Independent variable
Symbol
Level
–2
–1
0
1
2
Skim milk conc. (%)
X
1
6
8
10
12
14
Incubation temp. (°C)
X
2
32
34.5
37
39.5
42
Incubation time (h)
X
3
8
12
16
20
24
Starter added amount (%)
X
4
0.02
0.065
0.11
0.155
0.2
1.0% glucose was added to each skim milk conc.