Table 2. Regression models fitted to the experimental data of response variables.
| Response | Model equationa | Probability of lack of fit | R 2 |
| TPC (mg GAE/g DW) | Y = 15.013364+4.513759X 1+0.923033X 2+2.182736X 3−3.334297X 1 2−3.004297X 2 2−2.129297X 3 2−2.185563X 1 X 3 | 0.1597 | 0.9937b |
| TFC (mg RE/g DW) | Y = 41.384322+18.636959X 1+3.438491X 2+3.676343X 3−11.249728X 1 2−7.534728X 2 2−9.244728X 3 2 | 0.1040 | 0.9877b |
| DPPH radical scavenging capability (%) | Y = 83.864603+10.942177X 1+3.247395 X 2+8.151488X 3−15.882841X 1 2−8.517841X 2 2−11.097841X 3 2−10.931425X 1 X 3 | 0.1594 | 0.9822b |
| ABTS radical scavenging capability (%) | Y = 90.535606+11.522496X 1+3.896676X 2+7.59029X 3−12.494807X 1 2−5.484807X 2 2−4.584807X 3 2−7.517612X 2 X 3−17.610938X 1 X 3−6.433863X 1 X 2 | 0.0617 | 0.9729b |
a
X1, EtOH (%); X2, Time (min); X3, T (°C). Coded values. b P<0.001.