Table 1.

RSM-predicted responses, including the optimum (fit) and confirmatory replicate (uncoded units).

Entry	X1 (temp, °C)	X2 (time, min)	X3 (amp, %)	TPC exp (mg GAE/100 ml)	TPC Pred	FRAP exp (mmol TE/L)	FRAP pred
1	45	6.00	70.00	143.91	143.50	12.04	11.92
2	50	8.00	80.00	137.30	139.97	10.56	10.86
3	45	6.00	90.00	107.84	108.97	10.65	10.56
4	45	10.00	90.00	105.95	106.15	9.89	9.79
5	50	12.00	80.00	95.94	95.28	8.43	8.32
6	50	8.00	60.00	113.34	113.21	10.23	10.12
7	55	6.00	70.00	126.71	127.88	11.57	11.69
8	55	10.00	70.00	101.14	101.38	9.24	9.33
9	55	6.00	90.00	139.21	138.97	11.70	11.59
10	50	8.00	80.00	140.38	139.97	10.95	10.86
11	50	8.00	80.00	139.94	139.97	10.95	10.86
12	55	10.00	90.00	118.17	119.97	9.45	9.58
13	50	4.00	80.00	124.10	124.59	11.34	11.45
14	50	8.00	80.00	141.71	139.97	11.06	10.86
15	50	8.00	100.00	97.31	97.27	8.90	9.00
16	40	8.00	80.00	135.83	135.76	12.44	12.54
17	60	8.00	80.00	134.06	133.96	12.22	12.10
18	50	8.00	80.00	137.74	139.97	10.77	10.86
19	50	8.00	80.00	141.71	139.97	10.90	10.86
20	45	10.00	70.00	131.56	133.18	10.67	10.80
OPT (fit)	40	6.75	64.04		154.63		13.25
OPT (exp rep.)	40	6.75	64.04	149.77		12.86

X1, temperature (°C); X₂, processing time (min); X3, ultrasound amplitude (%); FRAP, ferric reducing antioxidant power; TPC, total phenolic content; TE, Trolox equivalents; GAE, gallic acid equivalents; Exp, experimental; Pred, predicted; RSM, response surface methodology.