From: Filter cake extract from the beet sugar industry as an economic growth medium for the production of Spirulina platensis as a microbial cell factory for protein
Factor
Unit
Symbol
Levels
− 2
− 1
0
+ 1
+ 2
NaNo3
(g/L)
X1
0.6
1.075
1.55
2.025
2.5
NaHCO3
X2
4.2
8.4
12.6
16.8
BFCE
(%)
X3
0.25
0.375
0.5
0.625
0.75
pH
–
X4
8
8.75
9.5
10.25
11