Research Article
Comparative Studies of Combined Influence of Variables on the Esterification Degree of Pectin Extracted by Sulfuric Acid and Citric Acid
Table 2
Results of analysis of variance (ANOVA) for DEc.
| | Source | Sum of squares | DF | Mean square | F-value | P-value |
| | X 1 | 23.32 | 1 | 23.32 | 98.68 | <0.0001 | | X 2 | 41.36 | 1 | 41.36 | 174.98 | <0.0001 | | X 3 | 370.60 | 1 | 370.60 | 1567.94 | <0.0001 | | X 1 X 2 | 2.48 | 1 | 2.48 | 10.50 | 0.0143 | | X 1 X 3 | 0.25 | 1 | 0.25 | 1.04 | 0.3425 | | X 2 X 3 | 14.59 | 1 | 14.59 | 61.74 | 0.0001 | | X 12 | 0.029 | 1 | 0.029 | 0.12 | 0.7379 | | X 22 | 1.27 | 1 | 1.27 | 5.39 | 0.0533 | | X 32 | 10.44 | 1 | 10.44 | 44.19 | 0.0003 | | Model | 464.05 | 9 | 51.56 | 218.15 | <0.0001 | | Residual | 1.65 | 7 | 0.24 | — | — | | Lack of fit | 1.65 | 3 | 0.55 | — | — | | Pure error | 0.000 | 4 | 0.000 | — | — | | Cor total | 465.71 | 16 | — | — | — |
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