Development of state diagram of bovine gelatin by measuring thermal characteristics using differential scanning calorimetry (DSC) and cooling curve method

Mohammad Shafiur Rahman, Ghalib Al-Saidi, Nejib Guizani, Aminah Abdullah

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

A state diagram of bovine gelatin was developed by measuring the freezing curve, glass transition, unfolding, solids-melting lines, and ultimate maximum-freeze-concentration conditions. The freezing point decreased with the increase of solids; whereas glass transition, unfolding, and solids-melting decreased with the decrease of solids up to solids content 0.84 g/g gelatin and then remained constant. The freezing point, glass transition and solids-melting were modeled by Chen's model based on the Clausius-Clapeyron equation, modified Gordon-Taylor model, and Flory's equation, respectively. The ultimate maximum-freeze-concentration conditions were found as (T′m)u equal to -11.9 °C and (T‴g)u equal to -14.9 °C, and the characteristic solids content, X′s as 0.80 g/g sample (i.e. un-freezable water, X′w = 0.20), respectively. Similarly the value of Tgiv (i.e. intersection of vertical line passing through T′m and glass transition line) was estimated as 34 °C.

Original languageEnglish
Pages (from-to)111-119
Number of pages9
JournalThermochimica Acta
Volume509
Issue number1-2
DOIs
Publication statusPublished - Sep 20 2010

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Keywords

  • Freezing point
  • Glass transition
  • Maximal-freeze-concentration condition
  • Solids-melting temperature
  • Un-freezable water
  • Unfolding temperature

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Instrumentation

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