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BioMed Research International
/
2010
/
Article
/
Tab 1
/
Research Article
Factorial Design to Optimize Biosurfactant Production by
Yarrowia lipolytica
Table 1
Experimental range and levels of the independent variables used in the
2
4
full factorial design for the nitrogen source study.
Variable (g
l
−
1
)
Level
−
1
0
1
Peptone (
𝑥
1
)
0
6.4
12.8
Yeast extract (
𝑥
2
)
5
10
15
Ammonium sulfate (
𝑥
3
)
0
5
10
Urea (
𝑥
4
)
0
0.1
0.2