Table 4.
Analysis of variance (ANOVA) of Box–Behnken results.
| Source | Sum of squares | df | Mean square | F-value | p Value Prob > F |
|---|---|---|---|---|---|
| Model | 118.4751 | 26 | 4.556735 | 3.128665 | 0.0064 |
| A-sucrose | 0.16245 | 1 | 0.16245 | 0.111539 | 0.7421 |
| B-peptone | 0.025312 | 1 | 0.025312 | 0.01738 | 0.8965 |
| C-yeast extract | 0.0147 | 1 | 0.0147 | 0.010093 | 0.9210 |
| D-pH | 0.68445 | 1 | 0.68445 | 0.469945 | 0.5013 |
| E-incubation temperature | 17.78768 | 1 | 17.78768 | 12.21306 | 0.0024 |
| AB | 0.0676 | 1 | 0.0676 | 0.046414 | 0.8317 |
| AC | 0.0841 | 1 | 0.0841 | 0.057743 | 0.8127 |
| AE | 0.664225 | 1 | 0.664225 | 0.456058 | 0.5076 |
| BC | 5.0176 | 1 | 5.0176 | 3.445096 | 0.0790 |
| BD | 0.731025 | 1 | 0.731025 | 0.501923 | 0.4873 |
| BE | 1.5876 | 1 | 1.5876 | 1.09005 | 0.3096 |
| CD | 2.89 | 1 | 2.89 | 1.984281 | 0.1751 |
| DE | 3.8809 | 1 | 3.8809 | 2.664635 | 0.1191 |
| A2 | 8.800152 | 1 | 8.800152 | 6.042204 | 0.0237 |
| B2 | 10.28975 | 1 | 10.28975 | 7.064967 | 0.0155 |
| C2 | 1.626206 | 1 | 1.626206 | 1.116557 | 0.3039 |
| D2 | 6.367424 | 1 | 6.367424 | 4.371888 | 0.0502 |
| E2 | 0.249752 | 1 | 0.249752 | 0.17148 | 0.6834 |
| A2B | 18.3925 | 1 | 18.3925 | 12.62834 | 0.0021 |
| AC2 | 4.558817 | 1 | 4.558817 | 3.130094 | 0.0929 |
| AE2 | 6.161067 | 1 | 6.161067 | 4.230203 | 0.0537 |
| B2D | 1.401667 | 1 | 1.401667 | 0.962388 | 0.3389 |
| B2E | 4.972969 | 1 | 4.972969 | 3.414452 | 0.0803 |
| BE2 | 2.660004 | 1 | 2.660004 | 1.826365 | 0.1924 |
| CD2 | 3.5643 | 1 | 3.5643 | 2.447257 | 0.1342 |
| DE2 | 3.920417 | 1 | 3.920417 | 2.691767 | 0.1173 |
| Residual | 27.6725 | 19 | 1.456447 | ||
| Lack of fit | 21.77301 | 14 | 1.555215 | 1.318094 | 0.4060 |
| Pure error | 5.899483 | 5 | 1.179897 | ||
| Cor total | 146.1476 | 45 |
Polysaccharide (g/l) = − 330.5238773 + 4.36071875 * A − 12.31421875 * B + 12.97534722 * C + 46.30814815 * D + 17.24225 * E − 0.20021875 * A * B − 0.0944375 * A * C − 0.208725 * A * E − 0.28 * B * C + 0.824166667 * B * D + 0.94625 * B * E − 2.865555556 * C * D − 2.394666667 * D * E − 0.010620833 * A2 − 1.19625 * B2 − 0.598229167 * C2 − 0.347037037 * D2 − 0.228233333 * E2 + 0.003282813 * A2 * B + 0.01634375 * A * C2 + 0.00304 * A * E2 − 0.120833333 * B2 * D + 0.064375 * B2 * E − 0.019975 * B * E2 + 0.242222222 * C * D2 + 0.032333333 * D * E2.
Where: A: Sucrose; B: Peptone; C: Yeast extract; D: pH; E: Incubation temperature.