Table 2.
Plackett-Burman desing (PBD) and analysis of variance (ANOVA) for experimental results.
| RunOrder | A | B | C | D | E | F | Y(mg/g) |
|---|---|---|---|---|---|---|---|
| 1 | −1 | −1 | −1 | 1 | 1 | 1 | 12.53 |
| 2 | 1 | 1 | 1 | −1 | 1 | 1 | 18.15 |
| 3 | −1 | 1 | 1 | 1 | −1 | 1 | 19.23 |
| 4 | −1 | 1 | 1 | −1 | 1 | −1 | 11.30 |
| 5 | 1 | 1 | −1 | 1 | −1 | −1 | 18.67 |
| 6 | 1 | −1 | 1 | −1 | −1 | −1 | 15.67 |
| 7 | −1 | −1 | 1 | 1 | 1 | −1 | 18.84 |
| 8 | −1 | 1 | −1 | −1 | −1 | 1 | 7.24 |
| 9 | −1 | −1 | −1 | −1 | −1 | −1 | 6.94 |
| 10 | 1 | −1 | −1 | −1 | 1 | 1 | 12.17 |
| 11 | 1 | 1 | −1 | 1 | 1 | −1 | 15.11 |
| 12 | 1 | −1 | 1 | 1 | −1 | 1 | 22.36 |
| ANOVA | ||||||
|---|---|---|---|---|---|---|
| Source | DF | Adj SS | Adj MS | F-Value | P-Value | Inference |
| Model | 6 | 269.936 | 44.989 | 24.22 | 0.002 | ∗∗ |
| Linear | 6 | 269.936 | 44.989 | 24.22 | 0.002 | ∗∗ |
| A | 1 | 60.509 | 60.509 | 32.57 | 0.002 | ∗∗ |
| B | 1 | 0.006 | 0.006 | 0 | 0.956 | |
| C | 1 | 95.139 | 95.139 | 51.21 | 0.001 | ∗∗ |
| D | 1 | 110.304 | 110.304 | 59.38 | 0.001 | ∗∗ |
| E | 1 | 0.704 | 0.704 | 0.38 | 0.565 | |
| F | 1 | 3.273 | 3.273 | 176 | 0.242 | |
| Error | 5 | 9.288 | 1.858 | |||
| Total | 11 | 279.224 | ||||
R2= 0.9667 AdjR2= 0.9268 Pred R2= 0.8084.
A, pectinase dosage (mg/g); B, enzymatic time (min); C, ultrasonic time (min); D, ultrasonic power (W); E, ethanol concentration (%); F, solid-liquid ratio (w/v). Y, the extraction yield of hawthorn flavonoid (mg/g); DF, Degrees of Freedom; Adj SS, Adjusted Sum of Square; Adj MS, Adjusted Mean Square; R2, The coefficient of determination; “∗” and “∗∗”, significant in P < 0.05 and P < 0.01, respectively.