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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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    Melatonin Use in Post-harvest Fruit Physiology: Effect of Melatonin Treatments on Quality Properties, Primer and Seconder Metabolites Contents of Hawthorn Fruit During Cold Storage
    (Springer, 2024) Kucuker, Emine; Berk, Selma Kuru; Colak, Aysen Melda; Gundogdu, Muttalip
    Hawthorn is among the fruits that come to market in autumn in Turkey and are consumed especially for health. However, it is not on the market for a long time and this brings with it the problem of maintain. In this study, the effect of melatonin (MT) during storage was examined in order to preserve the quality of hawthorn fruit and extend its market life. For this purpose, hawthorn fruits were treated with different doses (0.10, 0.25, 0.50 and 1.0 mM) of melatonin and kept in cold storage for 10, 20 and 30 days. Weight loss, soluble solids content (SSC), acidity, antioxidant amount, firmness, organic acid and phenolic compound amounts of the fruit were examined. At the end of 30 days of storage, the lowest weight loss (0.81%) and the highest fruit flesh firmness (5.80 N) and SSC amounts were obtained in 0.10 mM MT application. Total antioxidants amounts increased with melatonin applications after one month of storage. Organic acid and phenolic compounds were significantly affected by storage time and melatonin and storage interaction applications. The amount of succinic acid determined as the main acid was recorded as 11.82 mg 100 g(-1) in 0.10 mM MT application after 30 days of storage. It has been determined that the amounts of phenolic compounds increase with melatonin applications. The highest amounts of gallic acid, hydroxybenzoic acid, neohesperidin and rutin were measured in 0.25 mM MT application after 30 days of storage. It was determined that the amount of vanillic acid increased by 85% with melatonin application compared to the control in one month storage. As a result, it was revealed that the fruit quality was maintained when hawthorn fruits were stored in cold weather for a month by applying melatonin.
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    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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    Organic acids, sugars, vitamin C content and some pomological characteristics of eleven hawthorn species (Crataegus spp.) from Turkey
    (Soc Biolgia Chile, 2014) Gundogdu, Muttalip; Ozrenk, Koray; Ercisli, Sezai; Kan, Tuncay; Kodad, Ossama; Hegedus, Attila
    Background: The Hawthorn (Crateagus sp.) mostly occurs around the temperate region of the world with a high number of species, producing a fruit with numerous beneficial effects for human health. The aim of the study was to determine organic acid and sugar contents in the fruit of a number of hawthorn species grown in Erzincan province of Turkey. Results: Citric acid was the predominant organic acid in all hawthorn species and C. pseudoheterophylla had the highest citric acid content (23.688 g/100 g). There were not statistically significant differences among hawthorn species (except C. atrosanguinea Pojark) in terms of fumaric acid content. C. pontica C. Koch had a higher content of vitamin C (9.418 mg/100 g) compared to other species. Fructose was the predominant sugar component in all species and C. monogyna subsp. monogyna Joiq had the highest fructose content (18.378 g/100 g). Conclusions: The high fruit quality of the studied species indicates the importance of this fruit in human nutrition as a natural source. The study revealed that there were differences in terms of fruit characteristics among hawthorn species and thus better quality hawthorn genotypes can be selected within the species. Hence, this study is considered to be a valuable reference for forthcoming studies. The high fruit quality of the studied species indicates the importance of this fruit in human nutrition as a natural source.
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    PHYSICOCHEMICAL SUBSTANCES AND BIOACTIVE COMPONENTS OF WILD CORNELIAN CHERRY (Cornus mas L.) FRUITS IN ERZINCAN PROVINCE OF EASTERN TURKEY
    (Serbian Genetics Soc, 2023) Ozrenk, Koray; Tas, Akgul; Gundogdu, Muttalip; Keskin, Nurhan; Ercisli, Sezai
    Turkey has a very rich flora due to diverse climatic and topographic conditions within the country. Cornelian cherry (Cornus mas L.) is an important wild edible fruits and widely distributed in Turkey and well known for its fruit antioxidants and nutrients. In this study, phytochemical content in fruits of a number of Cornelian cherry genotypes in Erzincan region were determined. The biochemical analysis included organic acids, sugars, vitamin C, antioxidant and individual phenolic compounds. In the study, organic acid content was between 253.09 mg/100 g and 112.50 mg/100 g. Vitamin C content varied between 115.85 mg/100g and 43.77 mg/100 g. Likewise, the sugar content of Cornelian cherry fruits varied from 6.17 g/100 g to 4.06 g/100 g. When the antioxidant content was examined, the highest antioxidant was 980.91 limol TE/g fresh weight (FW) base and the lowest was 490.38 limol TE/g FW. In the genotypes examined, gallic acid was determined as the highest among the individual phenolic compounds, while the individual phenolic amounts ranged from 38.93 mg/100 g FW to 4.31 mg/100 g FW. As a result of the study, it was determined that Cornelian cherry fruits are very rich in vitamin C and other phytochemicals and as a result of this examination, 24ER04 and 24ER08 genotypes came to the fore.
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    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.