Research Article
Extraction Optimization and Antioxidant Properties of African Eggplant (Solanum macrocarpon) Leaf Polyphenols
Table 6
ANOVA for response surface quadratic model for intercept.
| | Factor | Coefficient estimate | Df | Standard error | 95% CI
Low | 95% CI
High | VIF |
| | Yield | | Intercept | 23.72 | 1 | 0.53 | 22.37 | 25.07 | — | | 2.37 | 1 | 0.32 | 1.54 | 3.20 | 1.0 | | | 1 | 0.32 | | | 1.00 | | | 1 | 0.32 | | 2.63 | 1.00 | | | 1 | 0.46 | | 3.28 | 1.00 | | | 1 | 0.46 | | 0.72 | 1.00 | | | 1 | 0.46 | | 3.38 | 1.00 | | | 1 | 0.47 | | 2.26 | 1.01 | | | 1 | 0.47 | | 1.45 | 1.01 | | | 1 | 0.47 | | 0.86 | 1.01 |
| | Total polyphenol content | | Intercept | 430.23 | 1 | 13.44 | | 464.77 | | | 50.41 | 1 | 8.23 | | | 1.00 | | 6.72 | 1 | 8.23 | | | 1.00 | | 0.80 | 1 | 8.23 | | | 1.00 | | 16.41 | 1 | 11.64 | | | 1.00 | | 0.96 | 1 | 11.64 | | | 1.00 | | 127.66 | 1 | 11.64 | | | 1.00 | | 154.03 | 1 | 12.11 | | | 1.01 | | 41.82 | 1 | 12.11 | | | 1.01 | | 59.01 | 1 | 12.11 | | | 1.01 |
| | Total antioxidant activity | | Intercept | 22.22 | 1 | 0.50 | 20.92 | 23.52 | | | 1.30 | 1 | 0.31 | | | 1.00 | | 0.48 | 1 | 0.31 | | | 1.00 | | 1.25 | 1 | 0.31 | | | 1.00 | | 0.44 | 1 | 0.44 | | | 1.00 | | 0.80 | 1 | 0.44 | | | 1.00 | | 0.99 | 1 | 0.44 | | | 1.00 | | 5.16 | 1 | 0.45 | | | 1.01 | | 3.68 | 1 | 0.45 | | | 1.01 | | 2.95 | 1 | 0.45 | | | 1.01 |
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