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. 2019 Apr 2;19:79. doi: 10.1186/s12906-019-2486-8

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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. 7 — Comparison of chromatogram between PECN and several phenolic compounds at the wavelength of 254 nm demonstrated one peak that was believed to represent (Peak 4) cinnamic acid. Only chromatogram of cinnamic acid was presented for comparison purposes