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    Effects of Aloe vera and Modified Atmosphere Packaging on the Quality and Biochemical Properties of Pear Fruit During Cold Storage
    (Springer, 2024) Ogurlu, Ferhat; Kucuker, Emine; Aglar, Erdal
    The aim of the study was to determine the effect of Aloe vera (AV) and modified atmosphere packaging (MAP) applications on post-harvest fruit quality in 'Ankara' pear cultivar. Fruit treated with MAP, AV (33%) and MAP + AV were stored for 120 days at 1 degrees C and 90 +/- 5% relative humidity. The quality analyses and measurements such as weight loss, decay rate, fruit firmness, soluble solids content (SSC), titratable acidity (TA), pH, total phenolic compounds, antioxidant capacity, organic acids and specific phenolic compounds were made on the 30th, 60th, 90th and 120th days of the cold storage. The losses in fruit firmness were less with MAP and MAP + AV applications, but these applications were found to significantly reduce weight loss and decay rate. It was determined that fruit color characteristics were maintained in all applications. With MAP and AV applications, the increase in SSC and the decrease in TA ratios were lower in fruit, so fruit ripening was delayed. However, the changes in the individual phenolics and organic acids content during cold storage were lower in fruit treated with MAP and AV. As a result of the study, it was concluded that MAP and AV applications on pear can be effectively used in delaying maturity and maintaining quality during cold storage.
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    Impact of Postharvest Putrescine Treatments on Phenolic Compounds, Antioxidant Capacity, Organic Acid Contents and Some Quality Characteristics of Fresh Fig Fruits during Cold Storage
    (Mdpi, 2023) Kucuker, Emine; Aglar, Erdal; Sakaldas, Mustafa; Sen, Fatih; Gundogdu, Muttalip
    The storage and shelf life of the fig, which has a sensitive fruit structure, is short, and this results in excessive economic losses. In a study carried out to contribute to the solution of this problem, the effect of postharvest putrescine application at different doses (0, 0.5, 1.0, 2.0, and 4.0 mM) on fruit quality characteristics and biochemical content during cold storage in figs was determined. At the end of the cold storage, the decay rate and weight loss in the fruit were in the ranges of 1.0-1.6% and 1.0-5.0 %, respectively. The decay rate and weight loss were lower in putrescine-applied fruit during cold storage. Putrescine application had a positive effect on the changes in fruit flesh firmness values. The SSC rate of fruit varied between 14 and 20%, while significant differences in the SSC rate occurred depending on storage time and putrescine application dose. With putrescine application, the decrease in the acidity rate of the fig fruit during cold storage was smaller. At the end of the cold storage, the acidity rate was between 1.5-2.5% and 1.0-5.0. Putrescine treatments affected total antioxidant activity values and changes occurred in total antioxidant activity depending on the application dose. In the study, it was observed that the amount of phenolic acid in fig fruit decreased during storage and putrescine doses prevented this decrease. Putrescine treatment affected the changes in the quantity of organic acids during cold storage, and this effect varied depending on the type of organic acid and the length of the cold storage period. As a result, it was revealed that putrescine treatments can be used as an effective method to maintain postharvest fruit quality in figs.
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    Öğe
    New Approaches in Fig Preservation: Use of Melatonin to Maintain Postharvest Quality of Fig (Ficus Carica L.) Fruit During Cold Storage
    (Springer, 2023) Kucuker, Emine; Aglar, Erdal; Gundogdu, Muttalip; Tekin, Onur; Ogurlu, Ferhat; Ozcengiz, Ceyda Kizgin
    The storage and shelf life of the fig, which has a sensitive fruit structure, is short, and this results in too much economic losses. In the study carried out to contribute to the solution of this problem, the effect of postharvest melatonin application at different doses (0, 0.10, 0.25, 0.50 and 1.00 mM) on fruit quality characteristics and biochemical content during cold storage was determined. The weight loss and decay rates that increased with the prolongation of the cold storage period were lower in melatonin-treated fig fruit. Melatonin application delayed fruit softening. The soluble solids content (SSC) ratio in melatonin treated-fruit was lower, and melatonin was effective on titratable acidity (TA), but there were inconsistencies in the effect. It can be said that the effect of melatonin application on the decreasing phenolic compounds during cold storage is limited. The significant differences occurred between applications in terms of antioxidant capacity at the end of the cold storage. The highest values were recorded with the control application and the lowest values with the application of 0.10 mM melatonin. The decrease in the amount of individual phenolic compounds both during and at the end of cold storage was lower with melatonin applications. Melatonin application had an effect on flavonoid compounds during cold storage, but this effect varied depending on melatonin concentration and compound. Melatonin application was effective in the changes in the amount of organic acids during cold storage, and this effect varied depending on the species of organic acid and cold storage time. In the study, it was concluded that melatonin application can be used to maintain postharvest quality in fig.
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    Öğe
    New approaches in pear preservation: Putrescine and modified atmosphere packaging applications to maintain fruit quality during cold storage
    (Wiley, 2024) Ogurlu, Ferhat; Kucuker, Emine; Aglar, Erdal; Ozcengiz, Ceyda Kizgin; Uyak, Cuneyt
    Pear (P. communis L.), which is a climacteric fruit species, has a very short storage and shelf life, and significant losses occur due to high metabolic activity and the fruit's respiration rate after harvest. Therefore, preventing or reducing post-harvest quality losses in pear is one of the most basic problems awaiting solution. In this study, we planned for this purpose; the fruits of the Ankara pear cultivar treated with modified atmosphere packaging (MAP), putrescine (1 mM), and MAP + putrescine were stored for 120 days at 1 degrees C and 90 +/- 5% relative humidity. The quality analyses and measurements, such as weight loss, decay rate, fruit firmness, soluble solids content (SSC), titratable acidity (TA), total phenolic compounds, antioxidant capacity, organic acids, and specific phenolic compounds, were performed on the 30th, 60th, 90th, and 120th days. Weight loss and decay ratios were lower for putrescine and putrescine + MAP-applied fruit. With these applications, the softening of the fruit was slowed down, and the increasing SSC in the fruit and the decreasing TA rates were lower, and thus the ripening of the fruit was delayed. Changes in individual phenolic content and organic acids were lower in MAP and putrescine-applied fruit. The study revealed that MAP and putrescine applications in pear can be used effectively to maintain fruit quality after harvest. Putrescine and MAP treatments reduced the storage losses and decay ratio during cold storage in pear. Putrescine and MAP treatments maintained the fruit quality and bioactive compounds of pear during cold storage. Putrescine and MAP treatments have a significant effect on extending the post-harvest life of pear.image
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    Öğe
    Physiological effects of melatonin on polyphenols, phenolic compounds, organic acids and some quality properties of peach fruit during cold storage
    (Springer, 2024) Kucuker, Emine; Gundogdu, Muttalip; Aglar, Erdal; Ogurlu, Ferhat; Arslan, Tuncer; Ozcengiz, Ceyda Kizgin; Tekin, Onur
    In peach, which is a climacteric fruit species, the fruit deteriorates rapidly at post harvest with the increase in ethylene production and respiration rate during ripening, and significant changes occur in quality properties and antioxidant activity. In the study, the effect of melatonin applications at different doses (0, 0.10, 0.25, 0.50 and 1.00 mM) at postharvest on fruit quality characteristics and biochemical content during cold storage was determined. The increased weight loss and decay rate with the prolongation of the cold storage period were lower in melatonin-treated fruit and varied depending on the application concentration. Melatonin application was effective in maintaining fruit flesh firmness, but application concentration had no effect. An increase in soluble solids content (SSC) ratio and a decrease in acidity occurred during storage, and changes in SSC and titratable acidity ratios were lower with melatonin application. In general, melatonin application was effective in maintaining the concentration of organic acids, but this effect varied depending on the concentration and compound. As a result, it was concluded that 0.25 mM melatonin application can be used to maintain the postharvest fruit quality of peach.