Table 1.

Experimental values of the independent variables (except for the number of extraction cycles) for the single-factor experiment

No.	c e (%)	t e (min)	T e (°C)	r STS (g/ml)
1	30	10	30	3:20
2	50	20	40	3:30
3	60	30	50	3:40
4	70	40	60	3:50
5	90	50	70	3:60

c _e: ethanol concentration; t _e: extraction time; T _e: extraction temperature; r _STS: solid-to-solvent ratio. The experiment was carried out under static conditions in a beaker covered with a film to prevent loss of solvent, so the volume of the extract is not given