Water sorption isotherms of freeze dried fish sardines

S. S. Sablani, R. M. Myhara, Z. H. Al-Attabi, M. M. Al-Mugheiry

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Abstract

Water sorption isotherms of freeze dried fish sardines were determined at 25, 40 and 50°C using an isopiestic method. Water sorption modeling was carried out using the five-parameter Guggenheim-Anderson-deBoer (GAB) equation. The GAB equation was able to predict equilibrium moisture content (EMC) with a mean relative error of 7.4%. The correlation coefficient (R2) of the relationship between the actual and predicted values of EMC was 0.986. Modeling with GAB equation predicted monolayer moisture content (Xm) of 4.94% (d.b). Net isosteric heat of sorption, determined using Clausius-Clapeyron equation, varied from 12.07 to 0.86 kJ/mo1 as moisture content changed from 2.76 to 37.5% dry basis (d.b). Chemical composition analysis showed that fish sardine contained 71% (d.b.) crude protein, 10% (d.b.) fat and 15% (d.b.) ash.

Original languageEnglish
Pages (from-to)673-680
Number of pages8
JournalDrying Technology
Volume19
Issue number3-4
DOIs
Publication statusPublished - 2001

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Keywords

  • Freeze drying
  • GAB model
  • Isosteric heat
  • Quality
  • Storage
  • Water activity

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)

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