Thermodynamic approach to osmo-dehydration

Paola Pani, Alberto Schiraldi, Marco Signorelli, Dimitrios Fessas

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A thermodynamic approach is proposed to describe the osmo-dehydration treatment of apple pulp. The experimental evidence comes from isothermal desorption trends directly drawn from traces of Knudsen thermogravimetry and is strictly related to the water activity, a W, that is continuously recorded during the dehydration progress, thanks to the specific equipment used. The trends recorded concern three kinds of samples, namely, the nontreated and the partially osmo-dehydrated apple pulp and the sugar syrup used for the treatment, the investigations being applied to three different sugar syrups. It was recognized that these desorption trends actually reflect real equilibrium states of the systems considered at every dehydration level. Since the apple pulp may practically be referred to as a two aqueous phase system, namely, intra- and extracellular, the equilibrium condition imposes a W to be the same in either phase. This basic statement supports the view that the desorption trend of the nontreated apple pulp and that of the sugar syrup are actually related to the intra- and extracellular aqueous phases, respectively. The desorption trend of any partially osmo-dehydrated apple pulp remains between them and reflects the bi-phasic nature of the system. The approach also allows a quantitative description of properties and phenomena related to the dehydration, namely, extent of the cell shrinkage, proportion between intra- and extracellular mass, water diffusion coefficient through the cell membrane, expected sensorial differences related to the kind of dehydration process, and heat drying or osmo-dehydration performed with different sugar syrups.

Original languageEnglish
Pages (from-to)177-185
Number of pages9
JournalFood Biophysics
Volume5
Issue number3
DOIs
Publication statusPublished - 2010

Fingerprint

Dehydration
Thermodynamics
thermodynamics
syrups
pulp
desorption
apples
Pulp
Malus
Sugars
Desorption
sugars
Podophyllum peltatum
thermogravimetry
Thermogravimetry
water
shrinkage
Water
water activity
diffusivity

Keywords

  • Apple
  • Knudsen thermogravimetry
  • Osmo-dehydration
  • Water activity

ASJC Scopus subject areas

  • Food Science
  • Biophysics
  • Analytical Chemistry
  • Applied Microbiology and Biotechnology
  • Bioengineering

Cite this

Pani, P., Schiraldi, A., Signorelli, M., & Fessas, D. (2010). Thermodynamic approach to osmo-dehydration. Food Biophysics, 5(3), 177-185. https://doi.org/10.1007/s11483-010-9157-0

Thermodynamic approach to osmo-dehydration. / Pani, Paola; Schiraldi, Alberto; Signorelli, Marco; Fessas, Dimitrios.

In: Food Biophysics, Vol. 5, No. 3, 2010, p. 177-185.

Research output: Contribution to journalArticle

Pani, P, Schiraldi, A, Signorelli, M & Fessas, D 2010, 'Thermodynamic approach to osmo-dehydration', Food Biophysics, vol. 5, no. 3, pp. 177-185. https://doi.org/10.1007/s11483-010-9157-0
Pani P, Schiraldi A, Signorelli M, Fessas D. Thermodynamic approach to osmo-dehydration. Food Biophysics. 2010;5(3):177-185. https://doi.org/10.1007/s11483-010-9157-0
Pani, Paola ; Schiraldi, Alberto ; Signorelli, Marco ; Fessas, Dimitrios. / Thermodynamic approach to osmo-dehydration. In: Food Biophysics. 2010 ; Vol. 5, No. 3. pp. 177-185.
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