Table 2. Extraction conditions and responses for crocin contents obtained for the BBD

No.	Raw material ratio (g/100 mL)	Solvent concentration (%)	Ultrasonic amplitude (%)	Extraction time (min)	Crocin yield (mg · g–1dw)
1	2	60	60	6	80.94
2	2	40	50	6	72.00
3	2	40	60	8	77.85
4	2	20	60	6	68.52
5	2	40	60	4	79.62
6	2	40	70	6	82.62
7	2	60	60	6	79.76
8	2	40	50	6	72.08
9	2	40	60	8	77.53
10	2	20	60	6	69.69
11	2	40	60	4	78.61
12	2	40	70	6	82.29
13	3	40	60	6	95.58
14	3	60	50	6	67.32
15	3	60	60	8	65.80
16	3	60	60	4	64.75
17	3	40	50	4	63.05
18	3	40	70	8	59.28
19	3	40	70	4	60.54
20	3	40	60	6	93.70
21	3	20	70	6	62.52
22	3	60	70	6	71.17
23	3	40	60	6	95.77
24	3	20	60	4	70.01
25	3	40	50	8	56.45
26	3	20	60	8	68.54
27	3	20	50	6	71.37
28	3	40	60	6	94.53
29	3	60	50	6	66.52
30	3	60	60	8	66.82
31	3	60	60	4	66.69
32	3	40	50	4	63.47
33	3	40	70	8	60.38
34	3	40	70	4	61.91
35	3	40	60	6	94.18
36	3	20	70	6	54.86
37	3	60	70	6	71.56
38	3	40	60	6	96.51
39	3	20	60	4	70.75
40	3	40	50	8	57.30
41	3	20	60	8	69.93
42	3	20	50	6	71.98
43	4	20	60	6	69.03
44	4	60	60	6	67.04
45	4	40	70	6	71.89
46	4	40	60	4	65.68
47	4	40	50	6	70.01
48	4	40	60	8	68.80
49	4	20	60	6	70.61
50	4	60	60	6	68.54
51	4	40	70	6	71.71
52	4	40	60	4	65.93
53	4	40	50	6	70.33
54	4	40	60	8	69.50