Table 2 Regression coefficients of cubic polynomial model for total phenolics extraction yield response surface (z).
From: Boosting antioxidative polyphenols extraction efficiency via nano sized pomegranate peel particles
Equation number | Independent variables (X × y) | Parameters | R2 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
Linear | Quadratic | Cubic | Interaction | |||||||
β0 | β1 | β2 | β3 | β4 | β5 | β6 | β7 | |||
5 | C × D | 39.8 | 12.08 | -0.39 | -0.099 | 1.7e-05 | 7.1e-06 | -2.9e-07 | -0.001 | 0.931 |
6 | C × T | 515.8 | -9.37 | -25.44 | 0.213 | 0.593 | -0.001 | -0.004 | 0.017 | 0.807 |
7 | C × t | -22.2 | 19.50 | -21.45 | -0.322 | 0.737 | 0.002 | -0.007 | 0.020 | 0.791 |
8 | C × R | 17.0 | -8.66 | 11.37 | 0.205 | -0.137 | -0.001 | -9.8e-05 | -0.020 | 0.850 |
9 | T × t | -6.5 | 1.35 | 1.93 | 0.051 | 0.078 | -4.8e-04 | -0.001 | -0.031 | 0.776 |
10 | T × R | -11.2 | 3.99 | 4.15 | -0.041 | -0.066 | 6.2e-05 | -9.1e-04 | -0.013 | 0.779 |
11 | T × D | 120.6 | -20.00 | 3.28 | 0.509 | -0.007 | -0.003 | -2.2e-07 | -0.004 | 0.742 |
12 | t × R | -210.6 | 12.20 | 27.13 | -0.447 | -0.432 | 0.005 | -2.1e-04 | -0.009 | 0.802 |
13 | t × D | 425.7 | -6.24 | -1.05 | 0.321 | 0.002 | -0.004 | -2.0e-06 | 0.006 | 0.855 |
14 | D × R | 84.9 | 0.22 | -0.36 | 0.763 | 9.2e-04 | -0.015 | -7.6e-07 | -1.8e-04 | 0.994 |
