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. 2019 May 10;13(1):62. doi: 10.1186/s13065-019-0583-x

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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 — a FTIR spectra of the silk fibroin film before (blue line) and after (red line) the carbodiimide coupling reaction; b zoom-in of (a) for the region from 1588 cm⁻¹ to 1700 cm⁻¹; c zoom-in of (a) for the region from 2750 cm⁻¹ to 3750 cm⁻¹