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. 2014 Aug 27;2014:283024. doi: 10.1155/2014/283024

Table 1.

Central composite design (CCD) of independent variables for process optimization.

Run Coded Actual
Factor A
(X 1)		 Factor B
(X 2)		 Factor C
(X 3)		 Time,
min (X 1)		 Liquid-solid ratio,
mL/g (X 2)		 Microwave power,
W (X 3)
1 1 −1 1 14 20 700
2 −1 −1 1 6 20 700
3 0 0 0 10 30 500
4 −1 1 1 6 40 700
5 0 0 1.68 10 30 836.36
6 1.68 0 0 16.73 30 500
7 1 1 1 14 40 700
8 0 0 0 10 30 500
9 −1 −1 −1 6 20 300
10 1 1 −1 14 40 300
11 0 0 0 10 30 500
12 0 0 −1.68 10 30 163.64
13 −1 1 −1 6 40 300
14 1 −1 −1 14 20 300
15 0 0 0 10 30 500
16 0 0 0 10 30 500
17 0 −1.68 0 10 13.18 500
18 0 0 0 10 30 500
19 0 1.68 0 10 46.82 500
20 −1.68 0 0 3.27 30 500