Catechins

Theoretical Concentration

Determined* (μg/mL)

Precision (%RSD)

Accuracy (%)

(μg/mL)

Original*

Added

Total*

Intra-day

Inter-day

Intra-day

EGCG

6.67

2.5

9.17

9.05

0.77

0.83

95.3

6.67

5.0

11.67

11.47

0.98

1.43

96.1

6.67

10.0

16.67

16.12

0.98

1.97

94.6

EGC

7.13

2.5

9.63

9.56

0.43

1.48

97.3

7.13

5.0

12.13

12.05

1.01

1.56

98.5

7.13

10.0

17.13

16.99

0.47

1.68

98.6

EC

1.74

2.5

4.24

4.29

0.68

1.96

101.7

1.74

5.0

6.74

6.67

0.67

1.62

98.6

1.74

10.0

11.74

11.65

0.57

1.52

99.1

ECG

1.19

1.25

2.44

2.35

0.91

0.63

92.9

1.19

2.50

3.69

3.49

0.77

1.69

92.0

1.19

5.00

6.19

5.79

1.19

2.51

92.1

+C

2.50

1.25

3.75

3.75

0.81

1.78

100.2

2.50

2.50

5.00

4.98

0.77

2.53

99.4

2.50

5.00

7.50

7.87

1.03

2.01

107.5