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Table 2 Linear ranges, calibration curves, correlation coefficients, and detection limits for 1–4 analyzed using HPLC

From: Chemical characterization and antioxidative activity of four 3-hydroxyl-3-methylglutaroyl (HMG)-substituted flavonoid glycosides from Graptopetalum paraguayense E. Walther

Compound Linear range (μg /mL) Linear equation Squared correlation coefficient (r2) LOD* (μg/mL)
1 2–500 y = 20.930x–20.053 0.9999 0.6
2 4–500 y = 14.028x–0.100 0.9998 0.8
3 2–500 y = 25.918x–24.031 0.9998 0.5
4 2–500 y = 29.500x–16.592 0.9999 0.4
  1. *LOD = 3 × SD/slope.