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Botanical Studies

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.
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