Reference standards of bisdemethoxycurcumin, demethoxycurcumin, curcumin, curdione, curcumol, germacrone, and β-elemene were purchased from Sichuan Weikeqi Biological Technology Co., Ltd. (purity > 98%; Sichuan, China). Methyl cellulose was purchased from Sigma-Aldrich (USA).

The kidney cells of channel catfish (CC-K) was gained from Prof. Lingbing Zeng

from the Yangtze River Fisheries Research Institute of the Chinese Academy of

Fishery Sciences (Wuhan, China). Curcumin, demethoxycurcumin,

bisdemethoxycurcumin, glycyrrhizic acid, glycyrrhetnic acid, taxol, rotenone, saponin,

sanguinarium chloride, quercetin, schisandrol B, schisandrin A, schisandrin B,

schisandrol A, schisantherin A, genistein, artemisinin, chlorogenic acid, toosendanin,

hyericin, baicalein, baicalin, ginkgolide A, ligustilide, dihydroartemisinin, oxymatrine

and matrine were obtained from Weikeqi Biotechnology Co., Ltd. (China), and the

purity of all natural products ≥ 98%. Rifampicin and erythromycin was purchased

from Beijing Solarbio Technology Co., Ltd. (Beijing, China).

The standards of compounds A1–A35 were purchased from Chengdu Must Biotechnology. (Sichuan, China) and Sichuan WEIKEQI Biotechnology (Sichuan, China), and these compounds were all determined with the purities >98% by HPLC or GC method. Ten batches of DHQYCs were obtained from Jilin Long Xin Pharmaceutical.