Optimization of Keratin Hydrolysate Extraction from Tannery Sheep Hair Waste

Table 8

Analysis of variance (ANOVA).

Source	Sum of squares	Df	Mean square	F value	value
Model	243.75	8	30.47	370.83	<0.0001	Significant
A	107.65	1	107.65	1310.12	<0.0001
B	2.06	1	2.06	25.07	0.0004
C	4.69	1	4.69	57.08	<0.0001
AB	1.44	1	1.44	17.54	0.0015
AC	8.50	1	8.50	103.42	<0.0001
BC	0.9345	1	0.9345	11.37	0.0062
A^2	1.02	1	1.02	12.43	0.0048
B^2	97.84	1	97.84	1190.72	<0.0001
Residual	0.9038	11	0.0822
Cor total	244.66	19

where A denotes concentration, B denotes temperature, and C denotes time. The model found relevant for variance analysis was the quadratic regression model, where the model F value of 378.42 implies that the model is significant. P values less than 0.05 indicate that model terms are significant, wherein in this case, A, B, C, AB, AC, BC, A2, and B2 are significant model terms.