Controlled atmosphere and shelf life performance of a new late-maturing Japanese pear (Pyrus pyrifolia (Burm. F.) Nakai) cultivar ‘Atago’

The aim of this research was to investigate the optimum storage condition, duration and shelf life performance of a new late-maturing Japanese pear cultivar ‘Atago’ under normal atmosphere, controlled atmosphere and shelf life conditions. For this purpose, fruits without injury or decay were divided into two groups. Group 1 (control) was stored in normal atmosphere; group 2 was stored in controlled atmosphere at 2.5% O2 + 1.5% CO2. The fruits were stored at 0 °C and 90-95% relative humidity for 32 weeks. 120 fruits were removed from normal atmosphere and controlled atmosphere every two months. Analyses were conducted on 60 fruits immediately after removal from storage, whereas remaining 60 fruits were transferred to the shelf life conditions (20 °C and 60-65% relative humidity), where they were kept for 5 d for shelf life performance evaluation. Fruits were analyzed for weight loss, peel and flesh color, flesh firmness, pH, titratable acidity, soluble solid content, respiration rate, ethylene production, peel, internal and core browning, rotting, superficial and senescent scald and sensorial evaluation. According to results of ethylene production ‘Atago’ was evaluated in the moderate range of the ethylene-generating group of Japanese pears and accepted as a climacteric fruit. Core browning was at higher levels in normal atmosphere than controlled atmosphere at the end of the storage. Results suggested that ‘Atago’ should be stored in controlled atmosphere at 2.5% O2 + 1.5% CO2 to prevent core browning and rotting and to maintain a high-quality extended marketing period

Determination of Vitamin C and Organic Acid Changes in Strawberry by HPLC During Cold Storage

High pressure liquid chromatographic (HPLC) methods were used for measurement of vitamin C and organic acid changes of two strawberry cultivars (‘Dorit’ and ‘Selva’) during cold storage. Harvested strawberries at the last stage of commercial ripeness were placed in perforated (8 perforations, 10 mm diameter) plastic boxes and stored at 0°C temperature and 90-95% relative humidity for 10 days. Vitamin C content decreased in both cultivars but no significant differences were found in ‘Dorit’ from the beginning to the end of the storage. The highest share of total acids was contributed by citric acid. It decreased with increase in storage time in both cultivars. Malic acid content of cultivars also decreased with storage time. Tartaric, oxalic and fumaric acid contents fluctuated during storage, but at the end of cold storage these organic acids had decreased in comparison to initial values

Cold storage of sour cherry cultivar Kütahya

Bu çalışma, Isparta (İlavus Yaylası)'da yetiştirilen Kütahya vişne çeşidinin 3 farklı polietilen torba içerisinde soğukta muhafazası sırasındaki kalite değişimini incelemek amacıyla 2002 yılında Süleyman Demirel Üniversitesi Ziraat Fakültesi Bahçe Bitkileri Bölümü Derim Sonrası Fizyolojisi Laboratuarında yürütülmüştür. Meyve saplarıyla birlikte elle tam olum döneminde derilen meyveler 0°C sıcaklık ve % 90-95 nispi neme sahip soğuk odada 25 gün muhafaza edilmiştir. Araştırmada 2'si ithal ve 1'i yerli olmak üzere 3 farklı polietilen torba kullanılmıştır. Depolama boyunca 5'er gün aralıklarla alınan vişne örneklerinde ağırlık kaybı, meyve renk değişimi, meyve sapı renk değişimi, suda çözünür kuru madde içeriği, pH ve titre edilebilir asitlik içerikleri incelenmiştir. Muhafaza boyunca meyveler duyusal (görünüş-tekstür ve tat-aroma) olarak da değerlendirmeye alınmıştır. Araştırma sonunda, elde edilen bulgulara göre Isparta (İlavus Yaylası) koşullarında yetiştirilen Kütahya vişne çeşidinin depolama süresi sonunda (25. gün) tüm ambalaj materyalindeki meyvelerin pazarlanabilir durumda (5 puan) olduğu; ithal 2 ambalaj materyalindeki meyvelerin ise 15 gün boyunca meyve kalitesinde hiç bir değişiklik olmadığı (7 puan) belirlenmiştir. Depolama süresi boyunca yapılan değerlendirmelere göre, 2 numaralı ithal polietilen torbanın meyve kalitesini daha iyi koruduğu, onu ithal 1 ve yerli polietilen torbaların izlediği sonucuna varılmıştır.This research was conducted in University of Suleyman Demirel, Faculty of Agriculture, Department of Horticulture, Postharvest Physiology Laboratory to investigate the quality changes during cold storage of sour cherry cultivar of Kütahya in 3 different polyethylene bags grown in Isparta (Ilavus plateau) in 2002. The fruits harvested by hand and were stored in 3 different polyethylene bags named as local, import 1 and import 2 for 25 days at 0ºC temperature and 90-95%relative humidity in cold storage. During the storage period weight loss, fruit colour change, fruit stem colur change, soluble solid content, titretable acidity and pH values of fruit samples were determined at 5 days intervals. Sensory evaluations were also performed during the storage period. According to the results, at the end of the cold storage (25th days) fruits were in marketable stage (5 points) in all of three packaging materials. Fruits in import 2 polyethylene bag were the best quality (7 points) during the 15 days of cold storage. This packaging material preserved the fruit quality better than the other bags

The Effects of Several Postharvest Treatments on Shelf Life Quality of Bunch Tomatoes

Bunch tomatoes (Lycopersicon lycopersicum L.) ‘Bandita’ cv. were hand-harvested at red ripe stage. The plants were grown on hanging carrying system with high wire support training in coco peat media in a plastic greenhouse located in Antalya (Turkey). Harvested fruits were divided to four groups for these treatments: (1) control-not treated; (2) tomato wax (Tomato wax is a wax formulated from 99% food grade mineral oil and 1% water); (3)Nutrient solution (1% potassium nitrate + 0.5% zinc sulfate + 1% calcium chloride + 0.1% boron + 0.2% copper sulfate + 0.5% ascorbic acid + 0.1% salicylic acid) and (4) Herbal oil (Herbal oil is a natural product obtained from hazelnut fruit membrane contains a high level of antioxidant). Bunches, placed in carton boxes, stored at 20°C temperature and 90±5% relative humidity for 16 days. Weight loss of bunches, firmness, respiration rate, ethylene production, colour, soluble solid content, pH, titratable acidity and sensory attributes (external appearance and taste-aroma of fruits and wilting and drying of calyxes) of tomatoes were evaluated during storage. Tomato wax treatment was limited the weight loss and preserved firmness better than the others. Tomato wax, nutrient solution and herbal oil treatments were limited the respiration rate. Ethylene production of nutrient solution treated fruits showed the highest value followed by herbal oil, tomato wax and control group. The highest colour change was found in control group. The lowest soluble solid content and the highest level of acidity were found in fruits treated with tomato wax. Control , herbal oil and nutrient solution treatments were lost marketable quality after 8 days of storage. TW treatment gave the best result and provided to store bunch tomatoes at good quality for 12 days