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Journal of thermal analysis

, Volume 47, Issue 5, pp 1499–1511 | Cite as

The effect of water on the physicochemical and mechanical properties of gelatin

  • M. -F. Pinhas
  • J. M. V. Blanshard
  • W. Derbyshire
  • J. R. Mitchell
Article

Abstract

Strips of gelatin have been prepared by extrusion at different water contents varying from 20 to 50% H2O (dry weight basis, d.w.b.). The processes of subsequent hydration or dehydration of these strips were followed by dynamic mechanical thermal analysis (DMTA), wide-angle X-ray diffraction and NMR relaxation measurements. A comparison of the calculated dependence of theTg of gelatin (Tg anhydrous, 200‡C) on water content (using the Ten Brinke and Karasz equation) with experimental results derived from DMTA showed that freshly extruded material followed the theoretical plot below 25% H2O (d.w.b.), but at higher water contents, the7g deviated positively, probably due in part to the effect of delayed re-equilibration of water content after thawing of separated ice crystals. The experimental results determined after storage for one week fell on a different line, with aTg of 145‡C for anhydrous gelatin Possibly, theTg is elevated by crystallization — a view supported by the WAXS spectra. The NMR relaxation results also showed a profound mobilization of the gelatin protons at water contents greater than 25% d.w.b.

Keywords

crystallization gelatin glass transition mechanical properties relaxation times 

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Copyright information

© Akadémiai Kiadó 1996

Authors and Affiliations

  • M. -F. Pinhas
    • 1
  • J. M. V. Blanshard
    • 1
  • W. Derbyshire
    • 1
  • J. R. Mitchell
    • 1
  1. 1.Department Applied Biochemistry & Food Science School of AgricultureUniversity of NottinghamSutton BoningtonEngland

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