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Title: The impact of postharvest dehydration methods on qualitative attributes and chemical composition of ‘Xynisteri’ grape (Vitis vinifera) must
Authors: Constantinou, Savvas 
Gómez-Caravaca, Ana María 
Goulas, Vlasios 
Segura-Carretero, Antonio 
Koundouras, Stefanos 
Manganaris, George A. 
Major Field of Science: Agricultural Sciences
Field Category: Agriculture Forestry and Fisheries
Keywords: Bound volatiles;Commandaria;LC-DAD-qTOF-MS;Melanoidins;Phenolic compounds;Postharvest dehydration
Issue Date: Jan-2018
Source: Postharvest Biology and Technology, 2018, vol. 135, pp. 114-122
Volume: 135
Start page: 114
End page: 122
Journal: Postharvest Biology and Technology 
Abstract: The objective of this study was to compare the effect of traditional sun-drying method (TM) with four alternative dehydration methods [(a) multiple horizontal wires (MHW), (b) multiple vertical pallets (MVP), (c) low greenhouse (LGH) and (d) hot-air dryer treatment (HAD)] on phenolic composition, oenological parameters, aroma potential and browning compounds of musts obtained from dehydrated grapes (Vitis vinifera cv. ‘Xynisteri’). Dehydrated grapes of the examined cultivar are being used to produce ‘Commandaria’ dessert wine, a protected designation of origin product in Cyprus. LGH and HAD treatments led to a significant reduction of the dehydration period. Soluble solid contents were used to monitor the progress of dehydration process; no changes among the examined dehydration methods in reducing sugar composition were found. Notably, HAD led to a dramatic rise (3.2-fold) of titratable acidity that was obviously not related only to the concentration effect. Furthermore, all dehydration methods concentrated total bound volatiles and induced the formation of brown pigments. Based on the Folin-Ciocalteu index, only HAD and LGH induced a significant increase in total phenolic content in dehydrated grape musts. Subsequently, forty phenolic compounds were identified and quantified by LC-DAD-qTOF-MS. Results showed a significant effect of dehydration methods that vary according to the different groups of phenolic compounds considered. Similarly to Folin-Ciocalteu index, HAD and LGH methods increased significantly the phenolic content in grape musts, whereas MHW and MVP methods increased it slightly higher than the concentration factor. Flavonols, flavan-3-ols and flavanonols were the most affected polyphenolic groups. A significant increment of hydroxybenzoic and hydroxycinnamic acids, the predominant groups of phenolic compounds found in ‘Xynisteri’ grapes, was monitored. Taking into consideration that HAD cannot be exploited under the existing legal framework, LGH showed the greatest potential for the production of high quality dehydrated ‘Xynisteri’ grape must.
ISSN: 0925-5214
DOI: 10.1016/j.postharvbio.2017.09.005
Rights: © Elsevier
Type: Article
Affiliation : Cyprus University of Technology 
University of Granada 
Research and Development of Functional Food Centre 
Aristotle University of Thessaloniki 
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