Table 1 Linear Regression Data, Precision, Limits of detection (LODs) and Limits of quantification (LOQs) of the Investigated Compounds

From: Graphene nanoplatelets based matrix solid-phase dispersion microextraction for phenolic acids by ultrahigh performance liquid chromatography with electrochemical detection

Analyte

Calibration curve

r 2

Precision (RSD%)

LOD

LOQ

Intra-day n = 6

Inter-day n = 6

Retention time

Peak area

Retention time

Peak area

ng/mL

ng/mL

Sodium danshensu

y = 280.45 x + 58.275

0.9991

0.06

1.11

0.22

3.78

1.94

6.39

Protocatechuic aldehyde

y = 667.14 x + 128.85

0.9992

0.07

0.80

0.15

2.43

1.19

3.91

Rosmarinic acid

y = 170.82 x + 30.748

0.9996

0.07

3.59

0.23

4.57

4.25

14.03

Lithospermic acid

y = 281.12 x + 54.368

0.9991

0.05

1.15

0.19

2.41

3.61

11.93

Salvianolic acid B

y = 152.62 x + 29.499

0.9995

0.38

2.56

0.41

2.56

4.62

15.23

Salvianolic acid A

y = 261.54 x + 52.301

0.9992

0.11

1.24

0.09

4.16

3.70

12.22

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