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Table 2 Experiment matrix of factorial design and the response obtained for conversion, selectivity, and viscosity

From: Production of a biodiesel-like biofuel without glycerol generation, by using Novozym 435, an immobilized Candida antarctica lipase

Run Parameters
  Temperature Oil/ethanol ratio pH Conversion (%) Selectivity (%) Kinematic viscosity (mm2s−1)
1 1 −1 0 81.4 45.99 20.3
2 1 −1 −1 84.6 46.1 21.3
3 0 −1 −1 78.6 29.2 21.0
4 −1 −1 0 59.1 11.7 20.8
5 −1 1 1 100 40.4 13.3
6 1 1 1 100 39.6 22.3
7 −1 −1 −1 63.6 23.3 22.1
8 0 −1 1 89.5 34.1 19.0
9 0 1 0 95.7 31.4 15.2
10 0 −1 0 100 44.2 20.1
11 0 1 1 95.2 37.5 15.7
12 1 −1 1 100 72.5 18.6
13 1 1 −1 100 46.6 18.2
14 1 1 0 86.1 36.1 19.8
15 −1 1 0 94.9 46.8 13.4
16 −1 1 −1 100 70.9 10.8
17 0 1 −1 100 52.6 12.5
18 −1 −1 1 77.5 17.8 20.2
Repeated experiments
19 0 −1 0 100 43.4 22.5
20 −1 1 1 100 39.7 13.2
21 −1 −1 −1 64.4 22.6 20.1
22 −1 1 0 95.8 46.1 13.4
23 1 1 −1 100 47.5 16.2
24 0 1 −1 100 51.9 14.5
25 −1 1 −1 100 69.6 10.9
26 0 1 0 96.5 36.5 14.6
27 1 1 1 100 38.8 22.2
28 0 −1 −1 80.1 28.6 19.0
29 1 −1 1 100 71.4 18.5
30 −1 −1 0 60.2 11.0 20.3
31 1 −1 0 82.2 45.2 20.3
32 1 1 0 86.9 33.4 19.5
33 0 −1 1 90.3 33.4 18.1
34 0 1 1 97.0 36.8 15.1
35 1 −1 −1 85.4 43.4 21.6
36 −1 −1 1 69.7 16.3 20.6