Table 2 The results of response surface design.

From: Extraction and purification of total flavonoids from Zanthoxylum planispinum Var. Dintanensis leaves and effect of altitude on total flavonoids content

No.

Factors

Total flavonoids yield

%

A

B

C

D

1

0

0

1

1

1.42

2

1

− 1

0

0

1.34

3

− 1

0

0

− 1

1.12

4

0

− 1

0

− 1

1.75

5

0

− 1

0

1

1.72

6

0

0

0

0

2.25

7

0

0

− 1

1

1.42

8

− 1

-1

0

0

1.15

9

0

0

− 1

− 1

1.62

10

− 1

0

− 1

0

1.10

11

0

0

0

0

2.16

12

0

1

0

1

1.40

13

− 1

0

1

0

1.16

14

0

0

0

0

2.14

15

1

0

1

0

1.17

16

1

0

0

− 1

1.11

17

0

0

0

0

2.26

18

0

0

0

0

2.12

19

0

0

1

− 1

1.41

20

0

-1

− 1

0

1.62

21

0

1

0

− 1

1.37

22

0

1

1

0

1.47

23

− 1

1

0

0

1.18

24

1

0

− 1

0

1.23

25

1

1

0

0

1.01

26

0

1

− 1

0

1.33

27

1

0

0

1

1.18

28

− 1

0

0

1

1.14

29

0

-1

1

0

1.52