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. 2019 Jan 29;14:2. doi: 10.1186/s13020-019-0224-2

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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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