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. 2020 Feb 7;11:48. doi: 10.3389/fphar.2020.00048

Table 4.

Calibration curve for five compounds.

Compound	Calibration curve ^a	R²	Linear range (µg/mL)
Catalpol	y = 45.201x + 0.6434	0.9997	0.472–2.832
Verbascoside	y = 264.5x + 28.613	0.9991	0.346–2.076
Isoacteoside	y = 636.89x + 0.5168	0.9998	0.022–0.132
Luteolin	y = 1123.9x + 0.538	0.9995	0.028–0.168
Apigenin	y = 1083.6x + 0.2633	0.9995	0.018–0.108

^a

y = peak area and x = concentration (µg/mL).