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J Sci Food Agric

Title:		Effect of harvest time on table grape quality during on-vine storage
Author(s):		Piazzolla F; Pati S; Amodio ML; Colelli G;
Address:		"Dipartimento di Scienze Agrarie, degli Alimenti e dell'Ambiente, Universita di Foggia, Via Napoli 25, I-71122 Foggia, Italy"
Journal Title:		J Sci Food Agric
Year:		2016
Volume:		20150209
Issue:		1
Page Number:		131 - 139
DOI:		10.1002/jsfa.7072
ISSN/ISBN:		1097-0010 (Electronic) 0022-5142 (Linking)
Abstract:		"BACKGROUND: Postponing the harvest of grapes is a common practice in southern Italy, in order to delay harvest up to Christmas and make higher income from their sale. The aim of this work was to evaluate the effect of harvest time (over almost 3 months) on the quality of table grapes (cv. Italia). The experiment was repeated for two years (2010 and 2011). In 2010, grapes were harvested starting from 8 October and after 11, 27 and 48 days. In 2011, five harvest times were compared over a period of 56 days. Respiration rate, firmness, colour, sensory attributes, total soluble solids (TSS), pH, titratable acidity (TA), phenols and antioxidant activity were measured. In addition, in the second year, volatile compounds were evaluated. RESULTS: For both years, harvest time influenced most parameters, which indicated that metabolic changes took place in the plants. In 2010, harvest time influenced respiration rate, cluster and berry appearance scores, colour attributes, crunchiness, pH, TA, total phenol content and antioxidant activity. In 2011, harvest time influenced respiration rate, colour attributes, most sensory attributes, TSS and TA. Generally, late harvested grapes showed higher firmness, berry appearance score, sweetness, fruity taste, overall sensory evaluation score and TSS. Regarding volatile compounds, terpene content decreased during ripening, while C6 compounds showed a nonlinear trend. CONCLUSION: The results showed that table grape sensory quality could be increased by delaying harvest up to a certain time of the season, while excessive delay could reduce final grape quality"
Keywords:		Agriculture/*methods Antioxidants/*pharmacology Cell Respiration *Color Food Storage Fruit/*metabolism/standards Hardness Humans Hydrogen-Ion Concentration Italy Odorants Phenols/*metabolism/pharmacology *Taste Terpenes/metabolism Vitis/*metabolism Volati;
Notes:		"MedlinePiazzolla, Francesca Pati, Sandra Amodio, Maria Luisa Colelli, Giancarlo eng England 2015/01/08 J Sci Food Agric. 2016 Jan 15; 96(1):131-9. doi: 10.1002/jsfa.7072. Epub 2015 Feb 9"