Physical and structural characteristics of dates

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)

Abstract

This chapter presents the geometric characteristics, sorption isotherm, state diagram and instrumental texture profile analysis (TPA) of dates. The surface area and volume of date fruit can be estimated considering its shape as oblate spheroid. The GAB model parameters for date-fruits are compiled and can be used to predict the moisture sorption isotherm within the water activity 0.1 and 0.9. The BET monolayer values of date flesh vary from 8.88 to 12.43 g/100 g dry solids. Parameters of the Chen model for predicting freezing point are compiled for different dates. Similarly, parameters of Gordon-Taylor model are also compiled. The ultimate maximal-freeze-concentration condition of Deglet Nour dates was determined Tm' equal to -38.2 �C and Tg' as -48.0 �C with unfreezable water as 22 g/100 g. Thermal and mechanical analysis can be used to explore different structural characteristics of date flesh; these are matrix mobility, reaction and softening characteristics, melting and instrumental TPA.

Original languageEnglish
Title of host publicationDates: Postharvest Science, Processing Technology and Health Benefits
Publisherwiley
Pages157-169
Number of pages13
ISBN (Electronic)9781118292419
ISBN (Print)9781118292372
DOIs
Publication statusPublished - Sep 20 2013

Keywords

  • BET-monolayer moisture
  • Freezing point
  • Glass transition
  • Maximal-freeze-concentration conditions
  • Moisture sorption isotherm
  • State diagram
  • Texture profile analysis (TPA)
  • Un-freezable water
  • Water activity

ASJC Scopus subject areas

  • Engineering(all)
  • Agricultural and Biological Sciences(all)

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  • Cite this

    Rahman, M. S. (2013). Physical and structural characteristics of dates. In Dates: Postharvest Science, Processing Technology and Health Benefits (pp. 157-169). wiley. https://doi.org/10.1002/9781118292419.ch7