Extraction Optimization and Antioxidant Properties of African Eggplant (Solanum macrocarpon) Leaf Polyphenols

Table 4

ANOVA of regression equations.

Source	Sum of squares	df	Mean square	value	value	Status
YIELD
Model	124.37	9	13.82	16.60	0.0032	Significant
Residual	4.16	5	5	0.83
Lack of fit	1.69	3	3	0.56	0.46	Not significant
Pure error	2.47	2	2	1.24
Cor Total	128.54	14
Total polyphenol content
Model		9	20608.26	38.050	0.0004	Significant
Residual		5	541.62
Lack of fit		3	299.69	0.33	0.8087	Not significant
Pure error		2	904.52
Cor total		14
Total antioxidant activity
Model	193.77	9	21.53	28.24	0.0009	Significant
Residual	3.81	5	0.76
Lack of fit	2.75	3	0.92	1.73	0.3861	Not significant
Pure error	1.06	2	0.53
Cor total	197.59	14