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Journal of Thermal Analysis and Calorimetry

, Volume 124, Issue 3, pp 1255–1266 | Cite as

Study of the effect of tannins and animal species on the thermal stability of vegetable leather by differential scanning calorimetry

  • Cristina Carşote
  • Elena BadeaEmail author
  • Lucreţia Miu
  • Giuseppe Della Gatta
Article

Abstract

Micro-differential scanning calorimetry was used to reveal the deterioration patterns of collagen in vegetable-tanned leather. The influence of both the tannin type, i.e. hydrolysable or condensed, and collagen animal species, i.e. calf and sheep, was investigated. Comparison with the behaviour of unmodified collagen in parchment was made to explain the thermal destabilisation and denaturation of the chemically modified collagen in leather. Both leather and parchment were subjected to accelerate ageing by heating at 70 °C in controlled atmosphere at 30 % RH. The synergistic effect of the daylight exposure was studied by irradiating the samples in the visible domain with 4000 lx. The destabilisation effect induced by the hydrothermal ageing treatment was evident since the 8th day and reached a critical level after 32-day ageing time. The formation of damaged intermediate states with progressively lower thermal stability was the main feature of the deterioration pattern independent of the tannin type and collagen species. Quebracho-tanned calf leather was the most resistant against ageing, whereas chestnut-tanned sheep leather underwent de-tanning after a 32-day ageing period. Exposure to visible light irradiation induced an evident thermal stabilisation due to cross-link formation. The balance between thermal stabilisation and destabilisation processes in leather during visible light exposure was influenced by the tannin type.

Keywords

Leather Vegetable tannins Accelerated ageing Micro-DSC Collagen–tannin complex stability Temperature Relative humidity Visible light 

Notes

Acknowledgements

This research was funded by the Romanian Programme for Research and Innovation PNCDI II through the project Intelligent system for analysis and diagnosis of collagen-based artefacts (COLLAGE, PN II 224/2012). C. Carşote gratefully acknowledges the Executive Programme for Scientific and Technological Co-operation between the Italian Republic and Romania for her two research stages at the University of Turin, Italy, within the bilateral project Advanced techniques and interdisciplinary studies for improved assessment of historical parchments (ParIS, PN II 638/2013).

Supplementary material

10973_2016_5344_MOESM1_ESM.docx (38 kb)
Supplementary material 1 (DOCX 38 kb)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2016

Authors and Affiliations

  • Cristina Carşote
    • 1
    • 2
  • Elena Badea
    • 3
    • 4
    Email author
  • Lucreţia Miu
    • 3
  • Giuseppe Della Gatta
    • 5
  1. 1.National Museum of Romanian HistoryBucharestRomania
  2. 2.Department of Physical Chemistry, Faculty of ChemistryUniversity of BucharestBucharestRomania
  3. 3.ICPI Division, Advanced Research for Cultural Heritage (ARCH) GroupNational Research and Development Institute for Textile and Leather (INCDTP)BucharestRomania
  4. 4.Department of Chemistry, Faculty of Mathematics and Natural SciencesUniversity of CraiovaCraiovaRomania
  5. 5.Department of ChemistryUniversity of TurinTurinItaly

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