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. 2019 Oct 22;9:15117. doi: 10.1038/s41598-019-51513-1

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© The Author(s) 2019

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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FTIR and DSC characterization of differently stored and UV sterilized bioactive DP scaffolds. (A) FTIR absorbance spectra for bioactive DP scaffolds incorporating PDGF-BB or ascorbic acid, with or without UV sterilization. (B,C) DSC thermograms (not to absolute scale) of first heating for non-stored, stored and UV sterilized bioactive DP scaffolds with PDGF-BB or ascorbic acid, after 30 days long in vitro release study, compared to pure DP scaffolds and bioactive scaffolds before release study.