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Table 2 Linear regression data, precision, repeatability, stability and recovery of 4 analytes

From: Comparative analysis of four terpenoids in root and cortex of Tripterygium wilfordii Radix by different drying methods

Analytes

Linear regression

Linear range (μg/mL)

R2

Precision (RSD,%)

Repeatability (RSD,%,n = 6)

Stability (RSD,%,n = 6)

LOD (ng/ml)

LOQ (ng/ml)

The average recovery (%)

Intra-day (n = 6)

Inter-day (n = 6)

Mean

RSD

Triptolide

Y 1  = 282544X 1 -2417

59 l.0 ~ 3540

0.9998

2.95

1.22

2.53

2.83

1.36

4.12

96.49

1.70

Triptophenolide

Y 2  = 853507X 2 -2479

10.9 ~ 218

0.9999

3.55

4.03

3.04

3.40

0.97

2.91

100.28

2.42

Demethylzeylasteral

Y 3  = 12756962X 3 -560868

92.8 ~ 3612

0.9998

0.35

1.01

0.52

0.69

0.82

2.45

96.61

1.78

Celastrol

Y 4  = 12617709X 4 -804041

40.l ~ 1224

0.9999

0.27

0.642

0.86

0.75

1.67

5.01

96.95

0.27