Please use this identifier to cite or link to this item: http://hdl.handle.net/11400/3766
Title: Osmotic dehydration of fruits
Authors: Φαραντούρης, Νικόλαος Π.
Committee Members: [χ.ό.]
Item type: Postgraduate thesis
Keywords: Dehydration;Food--Drying;osmotic treatment;οσμωτική αφυδάτωση;οσμωτική αποξήρανση
Subjects: Food technology and engineering
Fruit
Τεχνολογία τροφίμων
Φρούτα
Issue Date: 11-Jan-2015
Publishing institution: Τεχνολογικό Εκπαιδευτικό Ίδρυμα Αθήνας. Σχολή Τεχνολογίας Τροφίμων & Διατροφής. Τμήμα Τεχνολογίας Τροφίμων
Abstract: The osmotic dehydration as a method of intermediate - moisture fruits production, was studied. The influence of the temperature, dipping time, fruit skin, calcium chloride addition and vacuum pressure on water loss and solute gain were investigated. The achievement of a prevailing dewatering effect with only marginal solute pick-up, proved to be related to an inverse relationship between the cross-flows of water and solute. Vacuum osmotic dehydration led to a special behaviour of mass transfer due to an intensification of capillary flow function. Vacuum treatments enhanced the dehydration rate .having a significant influence on sugar uptake. Moreover, the addition of small quantities of CaCfe to sucrose osmotic solution although managed to increase the driving force of the drying process, gave products with salty and unacceptable taste due to a high salt uptake. A mathematical model was developed for osmotic water removal of whole and halved apricots in a 70 Brix syrup. The model calculates the water losses as a function of the temperature and dipping time of osmotic dehydration; equation WLw = [0.796+(680.3/TM3.934 .104/T2)] tV2 can be used for whole intact apricots, while equation WLh = [-3.217 +(1188/T)-(5.108 .104/T2)] t1/2 for halved apricots. The predicted and experimentally measured water losses were found to be in close agreement.
Language: English
Citation: Faradouris, N. P. (1994) Osmotic dehydration of fruits. Master thesis. University of Humberside
Access scheme: Embargo
License: An error occurred on the license name.
URI: http://hdl.handle.net/11400/3766
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