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Table 2 Regression equations, linear ranges, correlation coefficients, and LLOQ of the tested compounds

From: Simultaneous determination of six active metabolites in Astragalus mongholicus (Fisch.) Bge. under salt stress by ultra-pressure liquid chromatography with tandem mass spectrometry

Analyte Linear range
(ng/mL)
Calibration curves r2
(n = 6)
LLOQ
(ng/mL)
Astragaloside IV 1.48–14,800 y = 0.4672x + 0.00004 0.9995 1.25
Cycloastragenol 0.148–1480 y = 0.1243x + 0.00002 0.9998 0.125
Calycosin-7-O-β-d-glucoside 1.48–14,800 y = 0.7575x + 0.0017 0.9999 1.25
Calycosin 0.148–1480 y = 4.836x + 0.038 0.9992 0.125
Ononin 1.48–14,800 y = 0.1166x + 0.0001 0.9994 1.25
Formononetin 0.148–1480 y = 3.0566x + 0.0042 0.9995 0.125