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Table 2 Experimental design and conversion yields of mango, neem and shea oils

From: ESolvent-free, enzyme-catalyzed biodiesel production from mango, neem, and shea oils via response surface methodology

S/no Experimental matrix Responses
Coded values Real values Conversion yield (%)
x1 x2 x3 x4 X 1 X 2 X 3 X4 Neem Mango Shea
1 1 0 0 0 10.00 45.00 10.00 24.00 91.68 92.27 98.77
1 1 0 0 0 10.00 45.00 10.00 24.00 92.71 91.11 99.70
2 −1 0 0 0 3.00 45.00 10.00 24.00 90.51 56.24 58.23
2 −1 0 0 0 3.00 45.00 10.00 24.00 90.77 61.69 60.72
3 0.5 0.866 0 0 8.25 60.00 10.00 24.00 71.74 63.87 99.03
3 0.5 0.866 0 0 8.25 60.00 10.00 24.00 68.98 68.45 99.31
4 −0.5 −0.866 0 0 4.75 30.00 10.00 24.00 94.76 82.69 86.03
4 −0.5 −0.866 0 0 4.75 30.00 10.00 24.00 96.24 85.15 84.15
5 0.5 −0.866 0 0 8.25 30.00 10.00 24.00 93.64 91.38 95.48
5 0.5 −0.866 0 0 8.25 30.00 10.00 24.00 94.34 89.37 94.98
6 −0.5 0.866 0 0 4.75 60.00 10.00 24.00 82.41 48.39 72.86
6 −0.5 0.866 0 0 4.75 60.00 10.00 24.00 86.94 49.38 73.74
7 0.5 0.289 0.816 0 8.25 50.01 15.00 24.00 92.54 91.01 82.70
7 0.5 0.289 0.816 0 8.25 50.01 15.00 24.00 92.53 89.77 85.19
8 −0.5 −0.289 −0.816 0 4.75 39.99 5.00 24.00 89.29 68.70 94.55
8 −0.5 −0.289 −0.816 0 4.75 39.99 5.00 24.00 85.71 70.11 94.70
9 0.5 −0.289 −0.816 0 8.25 39.99 5.00 24.00 93.33 90.82 96.61
9 0.5 −0.289 −0.816 0 8.25 39.99 5.00 24.00 92.52 90.88 97.11
10 0 0.577 −0.816 0 6.50 54.99 5.00 24.00 89.82 77.04 97.07
10 0 0.577 −0.816 0 6.50 54.99 5.00 24.00 88.52 73.64 97.70
11 −0.5 0.289 0.816 0 4.75 50.01 15.00 24.00 97.17 84.99 60.62
11 −0.5 0.289 0.816 0 4.75 50.01 15.00 24.00 93.58 75.32 59.74
12 0 −0.577 0.816 0 6.50 35.01 15.00 24.00 98.68 93.14 81.77
12 0 −0.577 0.816 0 6.50 35.01 15.00 24.00 97.65 92.52 78.24
13 0.5 0.289 0.204 0.791 8.25 50.01 11.25 36.00 97.88 96.30 100.00
13 0.5 0.289 0.204 0.791 8.25 50.01 11.25 36.00 98.90 98.36 99.89
14 −0.5 −0.289 −0.204 −0.791 4.75 39.99 8.75 12.00 93.44 45.32 66.50
14 −0.5 −0.289 −0.204 −0.791 4.75 39.99 8.75 12.00 95.30 47.85 62.75
15 0.5 −0.289 −0.204 −0.791 8.25 39.99 8.75 12.00 95.24 58.58 92.99
15 0.5 −0.289 −0.204 −0.791 8.25 39.99 8.75 12.00 95.46 57.11 97.78
16 0 0.577 −0.204 −0.791 6.50 54.99 8.75 12.00 95.58 71.97 99.78
16 0 0.577 −0.204 −0.791 6.50 54.99 8.75 12.00 95.63 71.15 95.09
18 −0.5 0.289 0.204 0.791 4.75 50.01 11.25 36.00 99.58 88.42 99.65
18 −0.5 0.289 0.204 0.791 4.75 50.01 11.25 36.00 98.52 87.77 99.85
19 0 −0.577 0.204 0.791 6.50 35.01 11.25 36.00 99.79 96.24 99.61
19 0 −0.577 0.204 0.791 6.50 35.01 11.25 36.00 99.80 96.74 99.54
20 0 0 −0.612 0.791 6.50 45.00 6.25 36.00 98.39 97.14 99.54
20 0 0 −0.612 0.791 6.50 45.00 6.25 36.00 95.54 96.33 99.54
21 0 0 0 0 6.50 45.00 10.00 24.00 90.70 97.34 96.62
21 0 0 0 0 6.50 45.00 10.00 24.00 91.43 93.58 98.22
R2          0.808 0.882 0.949
AED (%)\          2.58 5.95 2.85
  1. X 1 enzyme concentration, X 2 reaction temperature, X 3 quantity of added water and X 2 reaction time