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Öğe Comparison postharvest quality of conventionally and organically grown 'Washington Navel' oranges(Druckerei Liddy Halm, 2013) Candir, Elif; Kamiloglu, Muge; Ustun, Durmus; Kendir, Gulcan TugceThis study aimed to compare postharvest quality of conventionally and organically grown 'Washington Navel' oranges. Oranges from the conventional and certified organic citrus orchards were harvested at commercial maturity and kept at 4 degrees C for 5 months. Changes in weight loss, juice percentage, titratable acidity (TA), total soluble solid (TSS), sugars (fructose, glucose and sucrose), organic acids (citric, malic and ascorbic acid) content and incidence of fungal decay and chilling injury were determined at a month interval during storage. Conventionally grown oranges had lower weight loss and higher juice percentage than organically grown oranges during storage. Rind color (L*, C*, h degrees), TSS, sugar (fructose, glucose and sucrose) and malic acid content were not affected by the production systems at harvest and during storage. In both conventionally and organically grown oranges, rind color become darker (lower L*), more intense (higher C*) and deeper orange color (lower h degrees) while malic acid content remained constant during 5 months of storage. As storage time extended, a significant increase in TSS and sugar content and a decrease TA and citric acid content occurred in fruits from both production system. Compared to conventionally grown oranges, organically grown oranges had lower TA and citric acid, but better taste scores since they attained higher TSS/TA ratio at harvest and during storage. The taste of conventionally and organically grown oranges was rated as an acceptable throughout the storage period. Although there was no significant difference in ascorbic acid content of fruits between two production systems at harvest, lower ascorbic acid content was found in organically grown oranges, compared to conventionally grown oranges during storage. Incidence of fungal decay was low in conventionally and organically grown oranges after 5 months of storage and the production system did not affect the sensitivity to fungal decay. Chilling injury was not observed any of fruits from both production systems throughout storage period.Öğe Effects of modified atmosphere packaging and ethanol vapor treatment on the chemical composition of 'Red Globe' table grapes during storage(Elsevier, 2012) Ustun, Durmus; Candir, Elif; Ozdemir, Ahmet Erhan; Kamiloglu, Onder; Soylu, Emine Mine; Dilbaz, RamazanThe sugar, organic acid, and anthocyanin contents and antioxidant capacity of 'Red Globe' table grapes packaged in perforated polyethylene (PPE) or ZOEpac modified atmosphere packaging (MAP) bags, with or without different grades of ethanol vapor-generating sachets (Antimold (R) 30, Antimold (R) 60 or Antimold (R) 80) or an SO2-generating pad, were evaluated during 3 months of storage at 0 degrees C. Fructose, glucose, malic, and tartaric acid contents remained unchanged in grapes packaged in PPE or ZOEpac bags containing an SO2-generating pad throughout storage. In grapes packaged in PPE or ZOEpac bags with or without Antimold (R) sachets, fructose, glucose, and malic acid contents decreased whereas tartaric acid content increased during storage due to a higher incidence of fungal decay as compared to SO2 treatments. Citric acid content decreased in all treatments during storage. Anthocyanin content increased in the first 2 months of storage and then decreased by the end of storage. An Antimold (R) 80 sachet added to ZOEpac bags resulted in higher anthocyanin content, ferric-reducing antioxidant power (FRAP) and trolox equivalent antioxidant capacity (TEAC) during storage. (C) 2012 Elsevier B.V. All rights reserved.Öğe Effects of rootstocks on storage and shelf life of grafted watermelons(Druckerei Liddy Halm, 2016) Ozdemir, Ahmet Erhan; Candir, Elif; Yetisir, Halit; Aras, Veysel; Arslan, Omer; Baltaer, Ozay; Ustun, DurmusWatermelon fruits from non-grafted or grafted 'Crimson Tide' (CT) and 'Crisby' (CR) onto Ferro, RS841, Argentario and Macis rootstocks were compared for their postharvest quality during storage at 7 degrees C for 21 days and additional 7 days at 21 degrees C. Non-grafted and grafted CT and CR fruits did not exhibit chilling injury (CI) symptoms, but the 1-2% of fungal decay occurred after shelf life period following storage. Watermelons grafted on Ferro and RS841 rootstocks had higher flesh firmness thicker rind, lower ripening rating, more intense (higher C*) brighter red (lower h degrees value) color and higher lycopene content after shelf life period following storage, compared to non-grafted fruits. All of the fruit tested by the panelists received high taste scores of >7.9 out of 8.5 at the beginning, but the scores decreased to >6.8 out of 7.7 at the end of shelf life period. Watermelons could successfully be kept for 21 days at 7 degrees C and additional 7 days at 21 degrees C. Watermelons grafted on Ferro and RS841 rootstocks had higher postharvest quality, compared to the non-grafted fruits for both cultivars.Öğe Modified atmosphere packaging and ethanol vapor to control decay of 'Red Globe' table grapes during storage(Elsevier Science Bv, 2012) Candir, Elif; Ozdemir, Ahmet Erhan; Kamiloglu, Under; Soylu, Emine Mine; Dilbaz, Ramazan; Ustun, DurmusThe aim of this study was to determine the efficacy of several alternative postharvest treatments to sulfur dioxide (SO(2)) in maintaining quality and reducing fungal decay during cold storage of 'Red Globe' table grapes. Grapes were packaged in perforated polyethylene (PPE) or modified atmosphere packaging (MAP) bags (ZOEpac or Antimicrobial) with or without different grades of ethanol vapor-generating sachets (Antimold (R) 30. Antimold (R) 60 or Antimold (R) 80) or a SO(2)-generating pad, and the grapes were kept at 0 degrees C and 90-95% relative humidity for 4 months. Packaging of grapes with a SO(2) pad in PPE or ZOEpac bags provided better control of fungal decay and stem browning than PPE or ZOEpac bags alone, PPE or ZOEpac bags with Antimold sachets or Antimicrobial bags alone. The PPE bag containing the Antimold (R) 80 sachet was as effective as the SO(2) treatments in reducing the incidence of fungal decay in naturally infected and artificially inoculated grapes for 1 month. Ethanol vapor released by the Antimold sachets enhanced berry color, but caused stem browning depending on ethanol vapor concentrations in the headspace of the bags. The ZOEpac-210 bags alone resulted in significantly lower weight loss and incidence of stem browning, compared to other treatments: however, they did not reduce fungal decay or develop an appreciable level of modified atmosphere. (C) 2011 Elsevier B.V. All rights reserved.Öğe Rootstocks Affected Postharvest Performance of Grafted 'Crisby' and 'Crimson Tide' Watermelon Cultivars(Ankara Univ, Fac Agr, 2018) Ozdemir, Ahmet Erhan; Candir, Elif; Yetisir, Halit; Aras, Veysel; Arslan, Omer; Baltaer, Ozay; Ustun, DurmusWatermelon fruit from 'Crisby' (CR) and 'Crimson Tide' (CT) grafted onto Ferro, RS841. Argentario and Macis rootstocks and non-grafted CR and CT were compared for their postharvest quality at 7 degrees C for 21 days. Changes in rind thickness, weight loss, fruit flesh firmness, taste, total soluble solids, juice pH, titratable acidity, chilling injury and fungal decay, flesh color values. hallow heart, ripening, citric and malic acid, glucose, fructose, sucrose, total sugar, beta-carotene and lycopene were determined during storage at a weekly interval. Watermelon fruit cv. CT grafted on Ferro, RS841 and Argentario rootstocks had thicker rind, lower ripening score, higher flesh firmness and lycopene content, more intense red color during storage, compared to non-grafted fruit. In comparison to non-grafted fruit, CR fruit grafted on Ferro, RS841 and Argentario rootstocks had thicker rind and higher flesh firmness, but higher lycopene content and C* values with lower ripening scores were observed only in the fruit grafted on Ferro and RS841 rootstocks. Macis and Argentario may lead an over-ripening, softening and less intense flesh color with lower lycopene content for CR and/or CT fruit during storage. Watennelons could successfully be kept for 21 days at 7 degrees C. Watermelons grafted on Ferro and RS841 rootstocks retained better postharvest quality, compared to the non-grafted fruit for both cultivars.
