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. 2017 Sep 7;7:9521. doi: 10.1038/s41598-017-05398-7

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© The Author(s) 2017

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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Structural alterations of the parchment. Left: Light Transmitted Analysis (LTA) curves. In both graphs, the grey curve corresponds to the best fit of the quantity dL/dT, derivative of the light transmitted signal amplitude L as a function of temperature, describing the strength of the overall process of hydrothermal denaturation. Each curve has been deconvoluted in two different peaks associated with the denaturation of different collagen populations having different thermal stability. The peak temperatures T_N and T_S provide information about the thermal stability of the populations, the higher the peak temperature, the higher is the stability. The full width at half maximum of the peaks T_1/2 is related to the homogeneity of the collagen in terms of thermal stability, and therefore to the homogeneity of its preservation state; the lower the homogeneity, the larger is the peak width. Right: Physical appearance of parchment structure (SEM, 350x); (a) undamaged parchment, a diffused matrix encompassing the more robust fibers is clearly evident; (b) damaged sample, the encompassing matrix is completely absent in the damaged portions of the parchment.