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. 2022 Nov 9;26:62. doi: 10.1186/s40824-022-00304-3

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 4 — (a) Storage modulus and gelation time of the optimized SF-T hydrogel and SF-T/SF-EGCG composite hydrogels. (Mean ± SD, n = 5, NS: not significant, ^***: p < 0.001). (b) Photomicrographs of cross-section of the lyophilized SF-T and SF-T/SF-EGCG composite hydrogels. Scale bar = 100 μm. (c) Equilibrium swelling ratio of the SF-T and SF-T/SF-EGCG composite hydrogels incubated in PBS for 24 h and (d) their weight loss profile in PBS over 21 days. (Mean ± SD, n = 7, ^**: p < 0.01, ^***: p < 0.001). ATR-FTIR spectra of the hydrogels on (e) day 1 and (f) day 9. The dashed lines indicate the amide I band of fibroin β-sheet (1624 cm^− 1) and the amide I band of fibroin random coil (1650 cm^− 1)