Table 2.

Regression equations and correlation coefficients for 11 Gelsemium alkaloids in rat plasma.

Compound	Linear range (ng/mL)	Regression equation	Correlation coefficient
Humantenirine	0.1-200	y = 0.0125x − 0.0041	0.9962
Humantenine	0.1-200	y = 0.0092x − 0.0053	0.9991
Akuammidine	0.1-200	y = 0.0058x + 0.0134	0.9992
Gelsevirine	0.1-200	y = 0.0136x − 0.0060	0.9995
Rankinidine	0.1-200	y = 0.0117x + 0.0067	0.9987
n-Methoxyanhydrovobasinediol	0.1-200	y = 0.0153x + 0.0125	0.9993
Gelsenicine	0.1-200	y = 0.0161 x + 0.0010	0.9985
Gelsemine	0.1-200	y = 0.0018x − 0.0013	0.9967
Koumine	0.1-200	y = 0.0043x − 0.0014	0.9980
Koumidine	0.1-200	y = 0.0035x + 0.0025	0.9998
Sempervirine	0.1-200	y = 0.0048x + 0.0028	0.9950

y = peak area ratio of Gelsemium alkaloids versus IS; x = concentration of Gelsemium alkaloids.