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. 2018 Oct 31;12:109. doi: 10.1186/s13065-018-0480-8

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© The Author(s) 2018

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 — Purification of polysaccharides. A DEAE-52 anion-exchange column chromatography elution curve of crude polysaccharide extracted from Dendrobium officinale leaves. B, C Sephadex G-100 column chromatography elution curves of fraction a and b