Application of Full Factorial Design in Optimization of Solvent-Free Microwave Extraction of Ginger Essential Oil

Table 1

Coded and natural variables in 2³ factorial design.

Levels	[min.]	[watt]
Basic level (0)	20	464	—
High level (+1)	30	640	Sliced
Low level (−1)	10	288	Crushed
Interval	10	176	—