RESEARCH PAPER
Osmotic dehydration and freezing pretreatment for vacuum dried of kiwiberry: drying kinetics and microstructural changes
1
Faculty of Food Sciences, Department of Food Engineering and Process Management, Warsaw University of Life Sciences
(WULS-SGGW), Nowoursynowska 159c, 02-776 Warsaw, Poland
2
Department of Machines and Production Biosystems, Slovak University of Agriculture in Nitra, Slovak Republic
Final revision date: 2020-02-24
Acceptance date: 2020-03-10
Publication date: 2020-04-07
Corresponding author
Ewa Gondek
Department of Food Engineering and Process Management, SGGW, Nowoursynowska 159, 02-776, Warszawa, Poland
Department of Food Engineering and Process Management, SGGW, Nowoursynowska 159, 02-776, Warszawa, Poland
Int. Agrophys. 2020, 34(2): 265–272
KEYWORDS
TOPICS
ABSTRACT
This study investigated the effects of osmotic dehydration and freezing on the kinetics and microstructure of vacuum-dried kiwiberry. Both fresh and previously frozen fruit were dehydrated in sucrose, maltitol and xylitol. Freezing and osmotic dehydration were selected as possible ways to improve the drying kinetics and positively influence the taste of the fruit. This experiment focused on the analysis of microstructural changes induced by applied processing methods using the X-ray microtomography technique. The results showed that the fruit pretreated in sucrose suffered the least structural damage as expressed by the largest condensation of small pores and thin cell walls. Freezing and xylitol resulted in the accumulation of larger pores and thicker walls. The most rapid drying time of 678-688 min was observed for unfrozen samples, dehydrated in sucrose and maltitol. Freezing slowed down the drying process, by 60-100 min, in comparison to the unfrozen samples. The applied mathematical models proved useful in predicting the kinetics of the drying process. The equation proposed by Midilli et al. provided the best fit for predicting the kinetics of the process.
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