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Table 2 Linearities, regression equation, correlation coefficients, limit of detection (LOD), and limit of quantitation (LOQ) for glycryrrhizic acid (GA), liquiritin (LQ) and liquiritigenin (LG)

From: Hepatoprotective effect of licorice, the root of Glycyrrhiza uralensis Fischer, in alcohol-induced fatty liver disease

Compounds Linear range (ng/ml) Regression equationa Correlation coefficient LODb (ng/ml) LOQc (ng/ml)
Glycyrrhizic acid (GA) 12.5–5000 Y = 0.0004x – 0.0055 0.9999 4.62 13.99
Liquiritin (LQ) 12.5–1000 Y = 0.0059x + 0.0451 0.9997 1.27 3.86
Liquiritigenin (LG) 12.5–500 Y = 0.0289x + 0.1574 0.9998 0.54 1.64
  1. ay: Analyte area / IS area; x: concentration (ng/mL) of compounds
  2. bLOD = 3.3 x δ /S (δ; standard deviation, S; slope of the calibration curve)
  3. cLOQ = 10 x δ /S (δ; standard deviation, S; slope of the calibration curve)