Table 3 Analysis of variance (ANOVA) of the quadratic models for total pigments, antioxidant activity and total phenolic content (TPC)
Variable | Total pigment yield (mg/g DM) | ABTS (mg TRE/g DM) | TPC (mg GAE/g DM) |
|---|---|---|---|
\({x}_{1}\) | 0.4012 | 0.0042* | 0.3199 |
\({x}_{2}\) | 0.4023 | 0.9261 | 0.1604 |
\({x}_{3}\) | 0.1127 | 0.0009* | 0.7488 |
\({x}_{1}{x}_{2}\) | 0.6112 | – | 0.3370 |
\({x}_{1}{x}_{3}\) | 0.9018 | – | 0.9303 |
\({x}_{2}{x}_{3}\) | 0.0464* | – | 0.2111 |
\({x}_{1}^{2}\) | 0.0325* | 0.8238 | 0.0028* |
\({x}_{2}^{2}\) | 0.0368* | 0.4826 | 0.0589 |
\({x}_{3}^{2}\) | 0.4055 | 0.3996 | 0.7590 |
\({R}^{2}\) | 0.8627 | 0.8460 | 0.9003 |
Adjusted \({R}^{2}\) | 0.6157 | 0.7305 | 0.7209 |
F value | 3.492 | 7.3240 | 5.019 |
Lack of fit | 0.9921 | 0.4984 | 0.0332 |