Study on the Effect of Deep Eutectic Solvent Liquid Phase Microextraction on Quality Standard, Antitussive, and Expectorant of Sangbaipi Decoction

Table 3

Linear relationships of various constituents.

Ingredient	Regression equation	Linear range/ (μg/mL)	r	LOD/ (μg/mL)	LOQ/(μg/mL)
Palmatine	Y = 28.072X + 52.459	0.39∼78	0.9996	0.11	0.36
Berberine	Y = 36.045X − 27.853	0.543∼108.6	0.9995	0.14	0.46
Baicalein	Y = 12.978X + 36.503	0.422∼84.4	0.9996	0.09	0.30
Baicalin	Y = 16.184X + 16.13	0.2502∼50.04	0.9997	0.11	0.36