Ultrasound-Assisted Extraction of Antioxidant Compounds from “Cẩm” Purple Rice Bran for Modulation of Starch Digestion

Table 4

Optimize desirability and model validation.

Optimal extraction variables		Response variables	Predicted value	Experimental value^a	% difference^b	Control sample^c
Time (min)	29.38	TPC (mgGAE/g)	60.82		2.33
Temperature (°C)	69	TFC (mgQE/g)	3.27		0.71
Solvent/material	9.92	FRAP [μmol Fe(II)/g]	54.11		2.89
Desirability	0.94	DPPH (%)	74.78		1.82

^aExperimental values were recorded when sample was extracted under selected optimal conditions (three replicates, ); ^bpercentage difference between predicted and actual values; ^ccontrol sample was conducted under optimal conditions without ultrasound treatment (three replicates, ).