Optimization of Extraction Parameters by Using Response Surface Methodology, Purification, and Identification of Anthocyanin Pigments in Melastoma malabathricum Fruit

Table 1

Independent variables and their levels used for Box-Behnken design.

Variables	Factors	Levels
	𝑋	−1	0	1
Extraction temperature, (°C)	𝑋1	30	45	60
Extraction time, (min)	𝑋2	60	90	120
Solid to liquid ratio, (g/mL)	𝑋3	0.5 : 5	0.5 : 20	0.5 : 35