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

Table 7

Predicted and experimental values of the responses at some extraction conditions.

	Ethanol X1 (%)	Extraction time X3 (min)	Solid-liquid ratio X2	Extraction yield (%)	TPC (mg EGA/g extract)
Optimum conditions	70	40	11	31.37	257.86
Predicted conditions	70	40	11	30.25	255.34