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Table 2 Regression data, linear range, correlation coefficient, LOD and LOQ for marker compounds (n = 3) of GJT extract

From: Gyeji-tang water extract exerts anti-inflammatory activity through inhibition of ERK and NF-κB pathways in lipopolysaccharide-stimulated RAW 264.7 cells

Compound Linear range (μg/mL) Regression equationa Correlation coefficient (r 2) LODb (ng/mL) LOQc (ng/mL)
Gallic acid 1.56–100.00 y = 41971.92× + 834.16 1.0000 45.36 137.44
Albiflorin 1.56–100.00 y = 11838.31× + 1993.39 0.9999 197.61 598.81
Paeoniflorin 1.56–100.00 y = 14000.91× - 3078.78 1.0000 167.08 506.32
Liquiritin apioside 1.56–100.00 y = 16282.26× + 2703.99 0.9999 107.59 326.03
Liquiritin 1.56–100.00 y = 18152.25× + 2757.62 0.9999 96.51 292.45
Benzoic acid 1.56–100.00 y = 45334.92× + 22784.19 0.9997 51.60 156.37
Coumarin 1.56–100.00 y = 49833.92× + 8656.87 0.9999 35.15 106.53
Benzoylpaeoniflorin 0.31–20.00 y = 28757.81× + 814.63 0.9999 81.35 246.50
Cinnamic acid 0.31–20.00 y = 61499.33× + 3384.72 1.0000 28.49 86.32
Cinnamaldehyde 1.56–100.00 y = 131035.51× + 59890.08 0.9997 9.15 27.73
Glycyrrhizin 1.56–100.00 y = 8787.34× + 4482.00 1.0000 40.39 122.40
6-Gingerol 0.31–20.00 y = 5693.60× + 109.67 1.0000 258.61 783.66
  1. a y: peak area (mAU) of compounds; ×: concentration (μg/mL) of compounds
  2. bLOD = 3.3 × SD / S. (SD is the standard deviation of the blanks and S is the slope of the calibration curve)
  3. cLOQ = 10 × SD / S