Table 4.

Central composite design (CCD) matrix for optimisation the antioxidant components.

Treatment runs	α-tocopherol/astaxanthin (w/w)	Ascorbic acid/astaxanthin (w/w)
1(C)	0.50	0.50
2(C)	0.50	0.50
3	0.15	0.15
4	0.50	0.00
5(C)	0.50	0.50
6	0.85	0.85
7(C)	0.50	0.50
8	0.15	0.85
9	0.50	1.00
10	0.00	0.50
11(C)	0.50	0.50
12	1.00	0.50
13	0.85	0.15

(C) Centre point.