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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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    Effects of Different Rootstocks on the Fruit Quality and Phytochemical Compounds of 'Williams' Pears During Cold Storage
    (Springer, 2026) Zambak, Tayfun; Ozturk, Burhan; Ates, Umut; Ozturk, Ahmet; Uzun, Serkan
    This study was conducted to determine the effects of seven different rootstocks (Seedling, Quince A, Quince BA 29, Fox 11, Farold 40, OHxF 87, and OHxF 333) on the postharvest quality characteristics of 'Williams' pear fruits during cold storage at 0 +/- 0.5 degrees C and 90 +/- 5% RH for 120 days. Quality measurements were performed at monthly intervals (at harvest, 30th, 60th, 90th, and 120th days). Within this scope, changes in the characteristics of the fruits, including weight loss, respiration rate, firmness, soluble solids content, titratable acidity, vitamin C, total phenolics, and antioxidant activity (DPPH and FRAP), were evaluated. Research findings revealed that the quality losses observed during cold storage are significant in all parameters (p < 0.05). However, it was found that rootstock selection can significantly reduce these quality changes or influence the degree of quality loss. The study showed that pears grafted onto Quince A and Quince BA 29 rootstocks exhibited lower weight loss and maintained higher firmness compared to other rootstocks. Additionally, these rootstocks were more effective in preserving characteristics such as total phenolics, antioxidant activity, vitamin C, soluble solids content, and titratable acidity. This study demonstrates that rootstocks play a crucial role in maintaining key quality characteristics in 'Williams' pears during the postharvest cold storage period. Among the rootstocks examined, Quince A and Quince BA 29 can be said to be more effective in delaying and preventing quality losses during cold storage.