Structural Properties of Dried Potatoes, Mushrooms, and Strawberries as a Function of Freeze-Drying Pressure

Oikonomopoulou, VP; Krokida, MK

dc.contributor.author	Oikonomopoulou, VP	en
dc.contributor.author	Krokida, MK	en
dc.date.accessioned	2014-03-01T02:14:41Z
dc.date.available	2014-03-01T02:14:41Z
dc.date.issued	2012	en
dc.identifier.issn	07373937	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30091
dc.subject	Agricultural products	en
dc.subject	Freeze drying	en
dc.subject	Mechanical properties	en
dc.subject	Porosity	en
dc.subject	Structure	en
dc.subject.other	Apparent density	en
dc.subject.other	Differential scanning calorimeters	en
dc.subject.other	Dried products	en
dc.subject.other	Freeze drying	en
dc.subject.other	Freeze-dried products	en
dc.subject.other	Geometric characteristics	en
dc.subject.other	Mercury porosimeters	en
dc.subject.other	Porosity and pore size	en
dc.subject.other	Process condition	en
dc.subject.other	Saturated salt solution	en
dc.subject.other	Structural and mechanical properties	en
dc.subject.other	True density	en
dc.subject.other	Universal testing machines	en
dc.subject.other	Water activity	en
dc.subject.other	Agricultural products	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Drying	en
dc.subject.other	Fruits	en
dc.subject.other	Fungi	en
dc.subject.other	Helium	en
dc.subject.other	Low temperature drying	en
dc.subject.other	Mathematical models	en
dc.subject.other	Mechanical properties	en
dc.subject.other	Mercury (metal)	en
dc.subject.other	Porosity	en
dc.subject.other	Structure (composition)	en
dc.subject.other	Thermodynamic properties	en
dc.subject.other	Density (specific gravity)	en
dc.title	Structural Properties of Dried Potatoes, Mushrooms, and Strawberries as a Function of Freeze-Drying Pressure	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/07373937.2011.639475	en
heal.identifier.secondary	http://dx.doi.org/10.1080/07373937.2011.639475	en
heal.publicationDate	2012	en
heal.abstract	The structural and thermophysical properties of freeze-dried agricultural products (potatoes, mushrooms, and strawberries) were investigated to determine whether these properties were affected by freeze drying conditions. The true density of freeze-dried products was measured with a helium stereopycnometer, and apparent density was obtained by measuring their geometric characteristics. Porosity and pore size distribution were also measured with a mercury porosimeter. The mechanical properties of freeze-dried agricultural products were obtained using a universal testing machine. Dried products were equilibrated in saturated salt solutions of constant water activity and scanned with a differential scanning calorimeter (DSC) for the evaluation of glass transition temperature. Simple mathematical models were developed in order to correlate the structural and mechanical properties with process conditions. The apparent density and mechanical properties of freeze-dried products increased with the applied freeze-drying pressure, whereas the porosity decreased. The glass transition temperature decreased with the increment of moisture content and it was not highly influenced by process conditions. © 2012 Copyright Taylor and Francis Group, LLC.	en
heal.journalName	Drying Technology	en
dc.identifier.doi	10.1080/07373937.2011.639475	en
dc.identifier.volume	30	en
dc.identifier.issue	4	en
dc.identifier.spage	351	en
dc.identifier.epage	361	en