ÖZET u çalışma, farklı kükürt dioksit (SO2) jeneratörlerinin sofralık SultaniÇekirdeksiz üzüm çeşidinde depolama süresine ve kalitesine etkisini araştırmak amacıyla yürütülmüştür. Yeme olumu döneminde hasat edilen Sultani Çekirdeksiz üzümlerin bir grubu; SmartPac ambalajlarına konup ağzı kapatılmıştır. Diğer grup ise kasalar içindeki polietilen torbaların içine konarak ön soğutmadan sonra üzümlerin üstüne, hem altına hem de üstüne SO2 petleri konmuş veya SO2 petleri konmadan (kontrol) ağzı kapatılmıştır. SmartPac, SO2 üst ve SO2 alt petleri sırasıyla 4.5 g, 6.5 g ve 1.5 g sodyum metabisülfit içermektedir. Üzüm meyveleri -0.5 o C ve %90 oransal nemde 4 ay süreyle depolanmıştır. SmartPac ambalajlarında SO2 konsantrasyonu depolama sürecinde kararlı bir şekilde azalmış, 45 günlük depolama sonunda ise SO2 saptanamamıştır. SO2 petleri uygulananlarda ise SO2 konsantrasyonu 8-18 ppm arasında değişmiştir. Farklı SO2 jeneratörleri 2 aylık depolama süresince üzüm tanelerinin saptan kopma kuvvetine, rengi, suda çözünür kuru madde, titre edilebilir asit miktarı, olgunluk indeksi ve pH değerine etkisi birbirine benzerlik göstermiştir. Kontrol ve SmartPac uygulamalarında sırasıyla 2 ve 3 aylık depolama sonrası görülen çürüklük gelişimleri önemli düzeylerde olmuştur. Sonuç olarak, Sultani Çekirdeksiz üzümü, SmartPac uygulananlarda 2 ay, SO2 üst ve SO2 üst-alt pet uygulananlarda ise 4 ay süreyle başarıyla depolanabileceği saptanmıştır. ABSTRACThis study was conducted to determine the effects of different sulphur dioxide (SO2) generators on quality and storability of Sultana Seedless grapes. Grapes were harvested at fully ripe stage. The first group of samples were packaged and enclosed in SmartPac packages. The second group were packed in polyethylene bags. After the precooling process, the SO2 pads were placed at different positions as: above the grapes, at the top and bottom or no SO2 pads as the control group and then closed. SmartPac, with SO2 pads placed at the top and bottom had 4.5 g, 6.5 g and 1.5 g of sodium metabisulfite, respectively. Samples were stored at -0.5 o C and 90% relative humidity for 4 months. During the storage period, SmartPac SO2 contents indicated a stable decrease and after 45 days there were no SO2 gas remaining in the packages. The samples that were placed with SO2 generating pads remained at SO2 concentrations ranging between 8 and 18 ppm during the storage. Different SO2 generating pads showed similar effects on berry removal force, color, total soluble solids, titratable acidity, maturity index and pH during two months storage. After 2 and 3 months of storage, decay development became significant in the control group and in SmartPac applications. The results showed that the Sultana Seedless grapes can be stored successfully for 2 months in SmartPac packages and 4 months with SO2 generating pads.

Transportation of sweet cherry fruits to distant markets and further marketing processes often takes approximately 2-3 weeks. The present study investigates the quality changes during this time period at three stages for three sweet cherry cultivars: 'Early Burlat', 'Napoleon', and '0900 Ziraat'. Following pre-cooling, the sweet cherries were placed in modified atmosphere packages and exposed to the following stages for the indicated durations: transportation (T) [8 days at 2 °C and 85% relative humidity (RH)]; distribution center (DC) (4 days at 6.5 °C and 80% RH), and shelf-life (SL) (2 days at 19 °C and 70% RH). Weight losses at the end of the SL stage were 3.11, 3.18, and 2.74%, respectively in 'Early Burlat', 'Napoleon' and '0900 Ziraat'. Fruit firmness decreased after SL as compared to that at other stages and was more remarkable in '0900 Ziraat'. Decreased Chroma values which indicates, the intensity or color saturation were observed in all cultivars, whereas decreased hue angle values colours expressed in degrees were observed in the 'Early Burlat' and '0900 Ziraat'. In addition, a decrease was noted in the titratable acidity of all cultivars at the end of SL. The total soluble solids, total phenolic content, and antioxidant activities were similar for all cultivars at all stages. The visual appearance scores of 'Early Burlat' cherries decreased at the end of SL, because of development of pitting on the fruit surface. The fruit quality changes were limited at T and DC stages; however, these changes became more distinctive during the SL period. It was thus concluded that the SL duration and conditions were of the highest significance with regard to maintenance of the sweet cherry fruit quality.

Transportation of sweet cherry fruits to distant markets and further marketing processes often takes approximately 2-3 weeks. The present study investigates the quality changes during this time period at three stages for three sweet cherry cultivars: ‘Early Burlat’, ‘Napoleon’, and ‘0900 Ziraat’. Following pre-cooling, the sweet cherries were placed in modified atmosphere packages and exposed to the following stages for the indicated durations: transportation (T) [8 days at 2 °C and 85% relative humidity (RH)]; distribution center (DC) (4 days at 6.5 °C and 80% RH), and shelf-life (SL) (2 days at 19 °C and 70% RH). Weight losses at the end of the SL stage were 3.11, 3.18, and 2.74%, respectively in ‘Early Burlat’, ‘Napoleon’ and ‘0900 Ziraat’.Fruit firmness decreased after SL as compared to that at other stages and was more remarkable in ‘0900 Ziraat’. Decreased Chroma values which indicates, the intensity or color saturation were observed in all cultivars, whereas decreased hue angle values colours expressed in degrees were observed in the ‘Early Burlat’ and ‘0900 Ziraat’. In addition, a decrease was noted in the titratable acidity of all cultivars at the end of SL. The total soluble solids, total phenolic content, and antioxidant activities were similar for all cultivars at all stages. The visual appearance scores of ‘Early Burlat’ cherries decreased at the end of SL, because of development of pitting on the fruit surface. The fruit quality changes were limited at T and DC stages; however, these changes became more distinctive during the SL period. It was thus concluded that the SL duration and conditions were of the highest significance with regard to maintenance of the sweet cherry fruit quality.