Table 1. Experimental design for plant extracts using the D-optimal method
No.
Independent variable (%)
A:
Ecklonia cava
B:
Psidium guajava
C:
Paeonia japonica
(Makino) Miyabe & Takeda
1
49
48
3
2
4
25
71
3
1
72
27
4
94
1
5
5
49
48
3
6
3
94
3
7
94
1
5
8
26
71
3
9
47
4
49
10
1
50
49
11
4
2
94
12
47
4
49
13
32
35
33
14
64
17
19
Where A+B+C=100%.