Fig. 2

Analysis of OPAE through ultra-performance liquid chromatography (UPLC) equipped with a PDA eλ detector. Results are shown with matching standards of paeoniflorin (PEO), atractylenolide I (AOI), atractylenolide II (AOII) and atractylenolide III (AOIII). The UV absorption was monitored ranging from 200 to 400 nm