Optimization of Ultrasound-Assisted Extraction of Polyphenol Content from Zea mays Hairs (Waste)

Table 3

Analysis of variance (ANOVA) for the second-order model correlating the content of phenolic compounds with the experimental variables.

Source	Sum of squares	Degree of freedom	Mean square	value
Regression	1019.57	9	113.28	<0.01
Residual	24.16	16	1.51
Validity	24.16	3	8.05	<0.01
Pure error	0.0225	13	0.00173
Total	1043.74	25	—	—

R² = 0.977; R²_Adj = 0.964; R²_pred = 0.941.