Table 2.

Box–Behnken design: real variables and experimental responses (physical parameters)

Exp. no.	Real variables			Experimental responses
	X1 (°C)	X2 (%)	X3 (min)	Yield (%)		Clarity (%T)		Turbidity (NTU)		Viscosity (mPaS)		L* value		a* value		b* value
				Act	Pre	Act	Pre	Act	Pre	Act	Pre	Act	Pre	Act	Pre	Act	Pre
1	30	0.01	80	76	75.75	78.33	76.84	14.9	14.70	1.086	1.08	1.17	1.11	0.81	0.83	−0.37	−0.32
2	50	0.01	80	77	76.75	66.40	67.99	46.8	46.74	1.092	1.09	0.53	0.45	1.11	1.11	−0.20	−0.19
3	30	0.10	80	78	78.25	72.97	71.38	20.65	20.71	1.100	1.11	0.68	0.77	1.01	1.01	−0.18	−0.19
4	50	0.10	80	79	79.25	68.63	70.13	45.30	45.50	1.077	1.08	0.55	0.61	1.02	1.00	−0.21	−0.27
5	30	0.06	40	79	79.50	68.60	70.70	19.65	19.61	1.086	1.10	0.93	0.92	0.93	0.90	−0.16	−0.18
6	50	0.06	40	81	81.50	70.33	69.15	46.80	46.62	1.071	1.08	0.55	0.56	1.15	1.14	−0.18	−0.16
7	30	0.06	120	80	79.50	74.30	75.48	18.95	19.13	1.100	1.09	1.00	0.99	0.98	0.99	−0.19	−0.21
8	50	0.06	120	80	79.50	68.83	66.93	48.90	48.94	1.100	1.09	0.52	0.53	0.99	1.03	−0.21	−0.19
9	40	0.01	40	82	81.75	77.30	76.89	13.50	13.74	1.071	1.07	0.89	0.96	0.69	0.71	−0.15	−0.18
10	40	0.10	40	85	84.25	77.13	76.82	12.90	12.88	1.086	1.07	0.92	0.84	0.64	0.67	−0.16	−0.13
11	40	0.01	120	80	80.75	79.43	79.75	11.40	11.42	1.041	1.06	0.87	0.95	0.66	0.62	−0.15	−0.18
12	40	0.10	120	83	83.25	76.10	76.51	17.30	17.06	1.071	1.08	0.97	0.89	0.75	0.73	−0.21	−0.18
13	40	0.06	80	74	73.80	29.47	29.29	32.10	32.36	1.101	1.10	2.13	2.31	3.22	3.21	−1.40	−1.21
14	40	0.06	80	74	73.80	29.43	29.29	32.40	32.36	1.100	1.10	2.18	2.31	3.24	3.21	−1.15	−1.21
15	40	0.06	80	74	73.80	29.03	29.29	32.10	32.36	1.086	1.10	2.51	2.31	3.13	3.21	−1.10	−1.21
16	40	0.06	80	74	73.80	29.33	29.29	32.60	32.36	1.100	1.10	2.54	2.31	3.24	3.21	−1.27	−1.21
17	40	0.06	80	73	73.80	29.17	29.29	32.60	32.36	1.100	1.10	2.19	2.31	3.21	3.21	−1.13	−1.21