Table 1. The regression equations, linear range and lower limit of quantification (LLOQ) of the analytes.

Biosamples	Compounds	Regression equation	Correlation coefficient (r)	Linear range (ng/mL)	LLOQ (ng/mL)
Plasma	Quercetin (Qr)	y = 0.002550x−0.031	0.995	32.8–10,500.0	32.8
	Isoquercitrin (IQ)	y = 0.001785x + 0.132	0.998	24.4–976.0	24.4
	Quercetin-3-O-β-D-glucuronide (QG)	y = 0.001876x + 0.208	0.996	50.0–12,500.0	50.0