Skip to main content

Table 2 The standard curves of four flavonoids and two saponins

From: Rapid identification of growth years and profiling of bioactive ingredients in Astragalus membranaceus var. mongholicus (Huangqi) roots from Hunyuan, Shanxi

Compound Linear regression equationa Correlation coefficient (r) Linear range (μg) P value
Calycosin Y = 5273.7X − 0.7002 0.9999 0.0795–1.4310 0.0000
Calycosin-7-glucoside Y = 3214.5X + 110.92 0.9996 0.1236–5.3560 0.0000
Formononetin Y = 745.58X + 13.24 0.9999 0.0924–6.1600 0.0000
Ononin Y = 4175.4X + 11.209 0.9999 0.0350–0.7000 0.0000
Astragaloside A Y = 1.4106X + 2.3673 0.9995 0.3054–30.540 0.0000
AstragalosideII Y = 1.5954X + 1.8899 0.9996 0.4240–16.9600 0.0000
  1. aFor flavonoids, Y is the peak area score of analyte, X is the concentration of analyte (µg/mL); For saponins, Y is the logarithm of peak area score, X is the logarithm of concentration