Table 5 Stability and recovery of seven analytes

Gallic acid

6.36

3.34

7.13

5.16

1.03

98.1

2.71

98.9

1.32

97.8

2.32

101.2

3.12

99.7

1.44

Protocatechuic acid

5.79

5.46

6.18

4.0

4.62

101.2

3.32

99.8

1.43

97.6

1.18

103.7

3.54

102.7

1.98

Vanillic acid

3.14

3.68

6.25

8.80

2.19

96.2

1.39

97.3

1.79

102.3

1.25

92.2

2.81

103.1

2.32

Caffeic acid

6.61

5.10

8.50

2.47

7.87

103.8

1.48

95.8

3.24

98.3

2.50

98.6

2.44

98.2

3.16

Paeoniflorin

6.13

3.79

7.37

8.36

4.07

97.1

3.25

98.2

2.77

95.4

1.15

94.0

1.36

95.8

2.17

Ferulic acid

4.54

3.74

1.31

7.65

2.10

99.7

1.22

103.2

1.94

99.3

1.43

97.5

2.65

104.6

1.89

Senkyunolide I

6.87

2.82

2.47

8.91

4.07

96.9

2.31

98.1

2.13

98.1

2.86

94.0

1.91

98.1

2.34