Simultaneous Optimization of Microwave-Assisted Extraction of Phenolic Compounds and Antioxidant Activity of Avocado (Persea americana Mill.) Seeds Using Response Surface Methodology

Table 1

Three levels of the three variables of the extraction process.

Independent variables	Symbols	Coded levels
		−1	0	1
Ethanol concentration (%)	X1	40	60	80
Microwave power (W)	X2	80	240	400
Extraction time (min)	X3	1	3	5