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. 2019 Dec 9;19:356. doi: 10.1186/s12906-019-2781-4

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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. 1 — HPLC-ESI/MSⁿ base peak chromatogram of the total ion chromatogram for the lyophilized powder of Radix Astragali and Radix Angelicae Sinensis aqueous extract. The abscissa represents the retention time, and the ordinate represents the chromatographic peak intensity. (a) HPLC-ESI/MSⁿ analysis of Radix Astragali. (b) HPLC-ESI/MSⁿ analysis of Radix Angelicae Sinensis