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Chitosan coating improves the shelf life and postharvest quality of table grape (Vitis vinifera) cultivar Shahroudi

Changes of the total phenolics, catechin, and antioxidant capacity of the berries coated with chitosan were delayed, while quercetin 3-galactoside and total quercetin were higher in the control treatment. Overall, fruits coated with chitosan had greater external adequacy than untreated ones. | Turkish Journal of Agriculture and Forestry Turk J Agric For (2013) 37: 148-156 © TÜBİTAK doi:10.3906/tar-1101-1671 http://journals.tubitak.gov.tr/agriculture/ Research Article Chitosan coating improves the shelf life and postharvest quality of table grape (Vitis vinifera) cultivar Shahroudi 1 1 1 1 Mohammad Ali SHIRI , Davood BAKHSHI , Mahmood GHASEMNEZHAD , Monad DADI , 2, 2 Alexandros PAPACHATZIS *, Helen KALORIZOU 1 Department of Horticultural Sciences, Faculty of Agriculture, University of Guilan, Rasht, Iran 2 Technological Education Institute of Larissa, Department of Plant Production, Larissa, Greece Received: 26.01.2011 Accepted: 14.08.2012 Published Online: 26.03.2013 Printed: 26.04.2013 Abstract: Table grapes (Vitis vinifera) of the cultivar Shahroudi were coated with 0.5% or 1% chitosan and then stored at 0 °C for 60 days. Shelf-life qualitative traits including rachis and berry appearance and berry cracking, shattering, decay, browning, acceptability, and flavor were evaluated. Treated berries showed less weight loss, decay, browning, shattering, and cracking. Flavor-related factors such as total soluble solids (TSS), titratable acidity (TA), and TSS/TA ratio levels were higher in treated fruits; however, there was no significant difference between the fruits treated with 0.5% and 1% chitosan. Changes of the total phenolics, catechin, and antioxidant capacity of the berries coated with chitosan were delayed, while quercetin 3-galactoside and total quercetin were higher in the control treatment. Overall, fruits coated with chitosan had greater external adequacy than untreated ones. Key words: Chitosan, grape, phenolics, quality, storage 1. Introduction Postharvest deterioration of grapes can be due to physical, physiological, or pathological factors that may occur in the vineyard (preharvest) or after harvest. For example, rachis dehydration is a physical deterioration associated with high vapor pressure deficit between the rachis and the .