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Table 2 Treatments of the fractionated design with a central point

From: Hydrolysis of carotenoid esters from Tagetes erecta by the action of lipases from Yarrowia lipolytica

Factor A B C D E F G
No. Design coordinate G/L ml/L
1 −−++−−+ 10 3 2 2 1 0.8 4
2 +++++++ 20 5 2 2 2 2 4
3 −++−+−− 10 5 2 1.4 2 0.8 2
4 −+−+−+− 10 5 1 2 1 2 2
5 −−−−+++ 10 3 1 1.4 2 2 4
6 +−−++−− 20 3 1 2 2 0.8 2
7 ++−−−−+ 20 5 1 1.4 1 0.8 4
8 0000000 15 4 1.5 1.7 1.5 1.4 3
9 +−+−−+− 20 3 2 1.4 1 2 2
  1. + and − represent high and low level, respectively, for factors ABCDEFG. 0 stands for a medium level which results from the average of the maximum and minimum value