Research Article
Optimization of Sulfide/Sulfite Pretreatment of Lignocellulosic Biomass for Lactic Acid Production
Table 3
Analysis of variance (ANOVA) of fitted model.
| | Model | Source | Sum of squares | df | Mean square | value | value | Prob > |
| Corncob | Na2S(a) NaOH (0.5%) | Model | 1461.27 | 9 | 162.36 | 72.6 | <0.0001 significant | Residual | 17.95 | 8 | 2.24 | Lack of fit | 14.45 | 5 | 2.89 | 2.48 | 0.2431 not significant | Pure error | 3.50 | 3 | 1.17 | Cor total | 1479.22 | 17 | | | | Na2SO3(b) NaOH (0.5%) | Model | 958.6 | 9 | 106.51 | 67.89 | <0.0001 significant | Residual | 12.55 | 8 | 1.57 | Lack of fit | 11.39 | 5 | 2.28 | 5.87 | 0.0880 not significant | Pure error | 1.16 | 3 | 0.39 | Cor total | 971.15 | 17 | | | |
| Bagasse | Na2S(a) NaOH (0.5%) | Model | 1392.09 | 9 | 154.68 | 27.98 | <0.0001 significant | Residual | 44.22 | 8 | 5.53 | Lack of fit | 30.42 | 5 | 6.08 | 1.32 | 0.4355 not significant | Pure error | 13.80 | 3 | 4.60 | Cor total | 1436.32 | 17 | | | | Na2SO3(b) NaOH (0.5%) | Model | 834.55 | 9 | 92.73 | 56.90 | <0.0001 significant | Residual | 13.04 | 8 | 1.63 | Lack of fit | 10.79 | 5 | 2.16 | 2.89 | 0.2060 not significant | Pure error | 2.24 | 3 | 0.75 | Cor total | 847.59 | 17 | | | |
| Water hyacinth | Na2S(a) NaOH (0.5%) | Model | 1189.95 | 9 | 132.22 | 22.37 | <0.0001 significant | Residual | 47.29 | 8 | 5.91 | Lack of fit | 37.89 | 5 | 7.58 | 2.42 | 0.2491 not significant | Pure error | 9.40 | 3 | 3.13 | Cor total | 1237.25 | 17 | | | | Na2SO3(b) NaOH (0.5%) | Model | 990.81 | 9 | 110.09 | 49.57 | <0.0001 significant | Residual | 17.77 | 8 | 2.22 | Lack of fit | 14.78 | 5 | 2.96 | 2.97 | 0.1997 not significant | Pure error | 2.99 | 3 | 1.0 | Cor total | 1008.58 | 17 | | | |
| Rice husk | Na2S(a) NaOH (0.5%) | Model | 1399.28 | 9 | 155.48 | 27.82 | <0.0001 significant | Residual | 44.70 | 8 | 5.59 | Lack of fit | 30.15 | 5 | 6.03 | 1.24 | 0.0832 not significant | Pure error | 14.55 | 3 | 4.85 | Cor total | 1443.98 | 17 | | | | Na2SO3(b) NaOH (0.5%) | Model | 770.44 | 9 | 85.86 | 34.61 | <0.0001 significant | Residual | 19.79 | 8 | 2.47 | Lack of fit | 17.29 | 5 | 3.36 | 4.15 | 0.1357 not significant | Pure error | 2.50 | 3 | 0.83 | Cor total | 790.23 | 17 | | | |
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