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Table 5 Linear regression data, LOD, and LOQ of six standard lignans

From: Screening for cytotoxic chemical constituents from Justicia procumbens by HPLC–DAD–ESI–MS and NMR

Standard

Regression equation

Linear range (μg/ml)

r2

LOD (μg/ml)

LOQ (μg/ml)

4

Y = 34.3060x − 2.2863

3.7–118

0.9999

0.021

0.071

8

y = 57.9005x − 3.3266

2.6–84

0.9999

0.013

0.044

10

y = 13.8900x − 5.3980

2.3–74

0.9998

0.043

0.142

16

y = 119.9074x − 40.5723

5.8–184

0.9999

0.005

0.017

19

y = 44.7432x − 18.4394

2.1–68

0.9998

0.017

0.057

20

y = 19.3973x − 23.6537

6.9–220

0.9998

0.034

0.113

  1. In the regression equation Y = aX + b, X refers to the concentrations (μg/ml), Y is the peak area