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	𝐹 value	𝑃 value
							Prob > 𝐹
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