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. 2019 Oct 31;23:16. doi: 10.1186/s40824-019-0164-z

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© The Author(s). 2019

Open Access This 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 — ¹H nuclear magnetic resonance (NMR, DMSO-d₆) spectrum of HA-PLGA. The methyl peak of acetamido group in HA at δ = 1.9 ppm (inset)