Table 1.

The central composite experimental design employed for formulation of edible coating composition

Sr. no.	Point type	SPI concentration (%) (A)	HPMC concentration (%) (B)	Olive oil concentration (%) (C)	Potassium sorbate concentration (%) (D)
1	Center	4	0.3	0.9	0.2
2	Center	4	0.3	0.9	0.2
3	Factorial	3	0.2	0.8	0.3
4	Factorial	5	0.2	1.0	0.3
5	Factorial	5	0.2	0.8	0.1
6	Factorial	3	0.4	1.0	0.3
7	Factorial	3	0.2	1.0	0.1
8	Factorial	5	0.4	1.0	0.1
9	Factorial	3	0.4	0.8	0.1
10	Factorial	5	0.4	0.8	0.3
11	Center	4	0.3	0.9	0.2
12	Center	4	0.3	0.9	0.2
13	Factorial	3	0.2	0.8	0.1
14	Factorial	3	0.4	1.0	0.1
15	Factorial	3	0.4	0.8	0.3
16	Factorial	5	0.2	1.0	0.1
17	Factorial	3	0.2	1.0	0.3
18	Factorial	5	0.2	0.8	0.3
19	Factorial	5	0.4	1.0	0.3
20	Factorial	5	0.4	0.8	0.1
21	Center	4	0.3	0.9	0.2
22	Center	4	0.3	0.9	0.2
23	Axial	2	0.3	0.9	0.2
24	Axial	4	0.5	0.9	0.2
25	Axial	4	0.3	0.9	0
26	Axial	4	0.3	0.9	0.4
27	Axial	6	0.3	0.9	0.2
28	Axial	4	0.1	0.9	0.2
29	Axial	4	0.3	1.1	0.2
30	Axial	4	0.3	0.7	0.2