Flavonoids Extraction from Taraxacum officinale (Dandelion): Optimisation Using Response Surface Methodology and Antioxidant Activity

Table 1

Code and level of factors chosen for the trials.

Symbols	Independent variables	−1	0	+1
𝑋1	Ethanol concentration (%, v/v)	30	40	50
𝑋2	Liquid-solid ratio (mL/g)	50	60	70
𝑋3	Extraction time (min)	30	40	50