丹酚酸B/丹参酸B/丹参酚酸B

The residue was dissolved in methanol, and then filtered through a 0.22 μm filter membrane (Millipore, USA). Standards were as follows: rotocatechualdehyde, hydroxysafflor yellow A, ferulic acid, naringin, salvianolic acid B, salvianolic acid A and cryptotanshinone (Weikeqi, China).

OS was collected from Yunnan Kunming in June 2017 and stored at room temperature until analysis. The reference standards of PCA, CAA, RA and chloramphenicol (CHL, IS) were purchased from Aladdin Chemistry (Shanghai, China). DSS was purchased from National Institutes for Food and Drug Control (Beijing, China). CA, Sal A, Sal B, SIN and EUP were purchased from Chengdu Weikeqi Bio-Technology Co., LTD (Chengdu, China). L-Ascorbic acid (VC) was purchased from Shanghai Macklin Biochemical Co., Ltd. (Shanghai, China).

Reference substances were obtained as follows: Cichoric acid (purity ≥ 98%), Salvianolic acid B (purity ≥ 98%), Sinensetin (purity ≥ 98%) and Eupatorin (purity ≥ 97%) were purchased from Chengdu Weikeqi Bio-Technology Co., LTD (Chengdu, China). Danshensu (purity ≥ 98%) was purchased from National Institutes for Food and Drug Control of China (Beijing, China). Rosmarinic acid (purity ≥ 97%), Caffeic acid (purity ≥ 98%) were purchased from Aladdin Chemistry (Shanghai, China).

Sal B (CAS 121521-90-2, 98%, Appendix S1) wasobtained from Sichuan Weikeqi Biological TechnologyCo., Ltd (Chengdu, China). Dulbecco’smodified Eagle’smedium (DMEM) and fetal bovine serum (FBS) were pur-chased from Gibco (Grand Island, NY, USA). CD44 wasfrom Wuhan Boster Co., Ltd. (Wuhan, China)