Table 2.

The regress equations, linear range, and LLOQs of the fourteen alkaloids.

No.	Alkaloids	Linear Regression Equation	Range (ng/mL)	Correlation Coeffiicient (r)	LLOQ (ng/mL)
1	Corydaline	Y = 0.139805χ − 0.006704	0.74–73.89	0.998	0.74
2	Tetrahydroberberine	Y = 0.097085χ − 0.004676	0.68–67.88	0.998	0.68
3	Tetrahydropalmatine	Y = 0.301153χ + 0.199059	1.78–177.7	0.996	1.78
4	Tetrahydrocolumbamine	Y = 0.216374χ − 0.021908	1.71–170.7	0.998	1.71
5	Tetrahydrocoptisine	Y = 0.177838χ − 0.044206	1.62–161.7	0.997	1.62
6	Columbamine	Y = 0.089586χ + 0.011028	0.68–67.68	0.999	0.68
7	Palmatine	Y = 0.120359χ + 0.052267	0.71–70.48	0.998	0.71
8	Berberine	Y = 0.125996χ + 0.005547	0.67–67.27	0.999	0.67
9	Epiberberine	Y = 0.072013χ − 0.003910	0.67–67.27	0.999	0.67
10	Coptisine	Y = 0.007792χ + 0.11179	3.20–320.3	0.998	3.20
11	Jatrorrhizine	Y = 0.085938χ − 0.008861	0.68–67.68	0.999	0.68
12	Dehydrocorydaline	Y = 0.106311χ + 0.107424	1.83–183.2	0.998	1.83
13	Oxoglaucine	Y = 0.113817χ + 0.031077	0.70–70.27	0.998	0.70
14	Protopine	Y = 0.106329χ + 0.007831	0.71–70.67	0.999	0.71