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    Changes in Quality Characteristics of Strawberry Tree (Arbutus unedo L.) Fruit Packed with Perforated Polyethylene Terephthalate During Cold Storage
    (Springer, 2024) Ozturk, Burhan; Hekimoglu, Can Alper; Olcer, Mehmet Ali; Ates, Umut; Uzun, Serkan; Karakaya, Orhan
    This study evaluated the effects of polyethylene terephthalate (PET) treatments with different numbers of holes on the preservation of strawberry tree (Arbutus unedo L.) fruit. For this purpose, PET treatments with different holes were evaluated for respiration rate, weight loss, color (L*, a*, and b*) changes, soluble solids content (SSC), titratable acidity (TA), vitamin C, total phenolics, total flavonoids, antioxidant activity (DPPH and FRAP), and individual phenolics. Analysis has shown that weight loss increases as storage time increases. It has been determined that PET 2 treatment is more effective than PET 1 in terms of weight loss and respiratory rate. During the storage, TA and SSC were lower in PET 2, while the vitamin C content was higher. It was determined that PET treatments had different effects on color parameters, total phenolics, and total flavonoids. Particularly in the PET 2, total flavonoids and DPPH activity was significantly higher during storage. It has been determined that catechin is the major content in strawberry tree fruit, which increases in both treatments with the progress of cold storage. When the 10 individual phenolics examined were evaluated, storage time and PET treatments had different effects. The significant effect of PET treatments continued only for epicatechin and protocatechuic acid during storage. As a result, it has been shown that PET 2 treatment is more effective in preserving fruit quality and nutritional values.
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    How Does the Agro-Ecological Conditions Grown Kiwifruit (Actinidia deliciosa) Affect the Fruit Quality Traits and Bioactive Compounds during Shelf Life?
    (Mdpi, 2023) Korkmaz, Murat; Ozturk, Burhan; Uzun, Serkan
    The kiwifruit (Actinidia deliciosa cv. 'Hayward'), which shows climacteric characteristics, continues to ripen after harvest. In this process, quality losses occur in fruits, and this causes economic losses. The post-harvest storage conditions are essential in preventing these losses. The main purpose of this study was to assess the effect of agro-ecological conditions on quality traits and bioactive compounds of the kiwifruit throughout the shelf life. In this study, kiwifruit grown in 5 different locations (Ordu, Giresun, Rize, Samsun, and Yalova) constituted the plant material of the study. The fruits treated with modified atmosphere packaging (MAP) were stored at 0 +/- 0.5 C-degrees and 90 +/- 5% relative humidity (RH) for 150 days in cold storage. For shelf life measurements, fruits were kept at 20 +/- 1 C-degrees and 65 +/- 5% RH for 5 d. Quality analysis was performed at monthly intervals (at harvest, 30th, 60th, 90th, 120th, and 150th d). In this study, the lowest respiration rate at the end of the shelf life was measured in kiwifruit grown in Yalova. Flesh firmness was higher in kiwifruit grown in Rize, Ordu, and Giresun than Samsun. In all periods, Yalova's L* value in flesh was higher than that of Ordu. The opposite situation was observed for the hue angle. The soluble solids content (SSC) values measured in Samsun and Yalova were higher than in Ordu and Rize. In the last four measurements, higher vitamin C was detected in Yalova than in Ordu, Rize and Giresun. In all periods, the highest total phenolics and antioxidant activity (in DPPH assay) were obtained in kiwifruit grown in Yalova. On the contrary, the highest flavonoids were measured in kiwifruit grown in Ordu. As a result, it was revealed that agro-ecological conditions may affect the quality traits and bioactive compounds of kiwifruit.