Hypaconitine

Standard solution: All standards (Weikeqi biotech Co., Ltd., Chengdu, China) were weighed and added isopropanol-dichloromethane (1:1) mixed solution to prepare solution contained 10.32 μg/ml aconitine (Batch NO. 130723), 37.38 μg/ml mesaconitine (Batch NO.130402), 5.75 μg/ml hypaconitine (Batch NO. 130509), 33.34 μg/ml benzoylaconine (Batch NO. 130516), 7.92 μg/ml benzoylmesaconine (Batch NO. 130505), and 5.38 μg/ml benzoylhypaconine (Batch NO. 130401).

Fifteen standard compounds (psoralen, isopsoralen, corylifolin, corylifolinin, psoralidin, xanthotoxin, bergapten, osthole, imperatorin, aconitine, hypaconitine, mesaconitine, benzoylaconine, benzoylhypaconine, and benzoylmesaconitine; Figure 1), were purchased from Weikeqi Biological Technology Co., Ltd. (Chengdu, China). The purities of the compounds were >98% as determined by high-performance liquid chromatography (HPLC). The stock solution of each standard was prepared at a concentration of 1 mg/mL in 50% MeOH and stored at ?80°C until use.