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Table 2 The central composite design matrix employed for the three independent variables

From: Mono- and dioleyl p-coumarate phenolipids and their antioxidant activity in a muscle food model system

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Variables

X1

X2

X3

1c

0

0

0

2

1

1

1

3

−1

1

−1

4

0

0

−1

5c

0

0

0

6

1

−1

−1

7

−1

1

1

8

1

1

−1

9

0

0

1

10

−1

−1

1

11

1

0

0

12

0

1

0

13

1

−1

1

14

0

− 1

0

15c

0

0

0

16

−1

−1

−1

17

−1

0

0

  1. Note: X1: enzyme load; X2: reaction time; X3: mole ratio of substrates
  2. c: centre points; actual values of the independent variables seen in Table 1.