Sorption isotherms of celery leaves (Apium graveolens var. secalinum)

Authors

  • Franz Román
  • Oliver Hensel

Abstract

 

Franz Román, Oliver Hensel

(University of Kassel, Department of Agricultural Engineering Nordbahnhofstr. 1a, 37213 Witzenhausen, Germany)

 

Abstract: Sorption isotherms provide important information for the drying process and storage of foodstuffs.  The desorption isotherms of celery leaves at three temperatures (25, 40 and 50℃) as well as their adsorption isotherm at 25℃ were experimentally determined by means of the static gravimetric method, using eight saturated salt solutions with relative humidities in the range from 11% to 84%.  Six mathematical models (Halsey, Oswin, Henderson, GAB, Peleg and BET) were fitted to the data.  The Peleg model resulted in the lowest error in all cases.  A modification of the Peleg model was attempted to incorporate the effect of temperature in the desorption process.  The fitting was satisfactory, providing a single equation for calculation of the equilibrium conditions within the studied temperature range.

Keywords: sorption, isotherms, celery, model

 

Citation: Franz Román, and Oliver Hensel.  Sorption isotherms of celery leaves (Apium graveolens var. secalinum).  Agric Eng Int: CIGR Journal, 2010, 12(3): 137-141.

 

 

Author Biographies

Franz Román

Research assistant at the Department of Agricultural Engineering, Faculty of Organic Agricultural Sciences, University of Kassel

Oliver Hensel

Professor at the Department of Agricultural Engineering, Faculty of Organic Agricultural Sciences, University of Kassel

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Published

2010-11-14

Issue

Vol. 12 No. 3-4 (2010): CIGR Journal

Section

VI-Postharvest Technology and Process Engineering