Browsing by Author "Tekin, Onur"

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Biochemical Characterization of Mulberry (Morus Spp.) Genotypes From the Turkiye (Hizan, Bitlis): a Comprehensive Analysis of Fruit Properties and Bioactive Compounds
(Wiley, 2024) Uyak, Cuneyt; Aglar, Erdal; Ozturk, Burhan; Dogan, Adnan; Tekin, Onur
The present study was carried out to assess the fruit traits and phytochemical properties of 39 mulberry genotypes [Morus alba L. (16 white mulberry), Morus rubra L. (11 red mulberry), and Morus nigra L. (12 black mulberry)] selected in Bitlis province (Hizan) of Turkiye. Approximately, 1 kg fruit were hand-harvested from each genotype. The fruit size, fruit color, pH, titratable acidity, soluble solids content (SSC), vitamin C, total phenolics, total flavonoids, antioxidant activity, and individual phenolic compounds were determined. The fruit weight varied between 1.80 and 5.84 g in black mulberry, 1.22 and 4.18 g in red mulberry, and 1.29 and 3.10 g in white mulberry. In white mulberry, SSC was determined to be between 19.00% and 38.86%, and in black and red mulberry it was between 11.86% and 21.90% and 12.60% and 18.90%, respectively. The titratable acidity rate, which varied depending on the species, was lower in white mulberry, but the highest acidity rate was recorded in red mulberry. Vitamin C was determined as 33.13 mg 100 g(-1) in red mulberry, 24.10 mg 100 g(-1) in black mulberry, and 14.03 mg 100 g(-1) in white mulberry. Total phenolics in mulberries varied depending on the species, and the red mulberry fruit contained higher phenolic substances, followed by black and white mulberries. The total flavonoids varied between 0.27 and 7.83 g QE kg(-1), whereas the flavonoids varied depending on the species and genotype. The highest values in terms of bioactive compounds were recorded in fruits of the 13HZN23 and 37 genotypes. Black and red mulberry fruit were found to have higher levels of individual phenolic content than the white mulberrry fruit.
The Effect of Different Doses of 1-Methylcyclopropene on Postharvest Physiology and Predicting Ethylene Production Through Multivariate Adaptive Regression Splines in Cocktail Tomato
(Mdpi, 2022) Bahar, Askin; Cavusoglu, Seyda; Yilmaz, Nurettin; Tekin, Onur; Ercisli, Sezai
Maintaining the postharvest quality of tomatoes, which are essential in the world vegetable trade, is very important; otherwise, storage may cause severe quality and economic losses. This study aimed to determine the effects of 1-MCP treatments on quality and storage time to prevent quality loss and deterioration in tomatoes due to high temperature and to predict ethylene production through the Multivariate Adaptive Regression Splines algorithm during long-term storage. For this purpose, same-sized fruits were divided into three different groups. Two groups were treated with 1-MCP (625 and 1250 ppb), and the untreated fruit was the control. Then, the tomatoes were stored for 39 days at a temperature of 20 degrees C and relative humidity of 85-90%. The results obtained from the present study showed that the 1-MCP treatments prolonged the life and maintained the quality of tomato fruit during storage. The ethylene production and respiration rate were significantly lower in 1-MCP-treated fruit than in the untreated fruit during the storage period (p < 0.05). According to the Multivariate Adaptive Regression Splines algorithm, it was observed that increasing doses of 1-MCP inhibited ethylene production. Furthermore, weight loss and respiratory rate were effective on ethylene production at 100 and 43.9%, respectively. In conclusion, treating the fruit with 1250 ppb of 1-MCP was determined to be the best practice for maintaining all quality criteria during storage.
Effect of Methyl Jasmonate Treatments on Fruit Quality and Antioxidant Enzyme Activities of Sour Cherry (Prunus Cerasus L.) During Cold Storage
(Galenos Publ House, 2021) Cavusoglu, Seyda; Yilmaz, Nurettin; Islek, Firat; Tekin, Onur
The study was carried out to investigate the effect of methyl jasmonate (MeJA) treatments (0.5 and 1.0 mM MeJA) on quality characteristics such as weight loss, respiration rate, ethylene production, color, total phenolic content (TPC), total antioxidant capacity (TAC) and antioxidant enzyme activities of sour cherry fruit (Prunus cerasus L. cv. 'Kutahya') during cold storage. Fruit were stored at 0 +/- 1 degrees C and 90 +/- 5% RH for 36 days. The results indicated that MeJA treatments showed higher levels of total phenolic content, total antioxidant capacity and quality and were also effective on superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), malondialdehyde (MDA), ethylene production and respiration rate. In conclusion, 0.5 mM MeJA treatment showed the best maintaining of fruit quality among the concentrations of MeJA. It can be suggested that sour cherry could be stored successfully for 36 days at 0 degrees C following treatment of MeJA.
Effect of Methyl Jasmonate, Cytokinin, and Lavender Oil on Antioxidant Enzyme System of Apricot Fruit (Prunus Armeniaca L.)
(Mdpi, 2021) Cavusoglu, Seyda; Yilmaz, Nurettin; Islek, Firat; Tekin, Onur; Sagbas, Halil Ibrahim; Ercisli, Sezai; Necas, Tomas
Various treatments are carried out in order to extend both the shelf life and storage life of fresh fruit and vegetables after harvest and among them non-toxic for humans, environmentally and economically friendly alternative treatments are gained more importance. In the current study, methyl jasmonate (MeJA), cytokinin, and lavender oil which are eco-friendly and safe for human health were applied on apricot fruit. The treated fruit were stored at 0 degrees C and 90-95% relative humidity for 25 days and catalase (CAT), superoxide dismutase (SOD), and ascorbate peroxidase (APX) enzyme activities and lipid peroxidation of apricots after treatments were studied. According to the findings obtained from the study, it was observed that 5 ppm cytokinin and 1000 ppm lavender oil treatments of apricot fruit gave better APX and CAT enzyme activity, respectively. In addition, better SOD enzyme activity in fruit was obtained with MeJA + lavender oil treatments. As a result, it can be emphasized that the product quality of apricot fruit is preserved as both the eco-friendly application of MeJA, cytokinin, and lavender oil separately from each other and the treatment of combinations between these compounds activate the enzymatic antioxidant defense systems of apricot fruit after harvest.
Effect of Pre-Harvest Organic Cytokinin Application on the Post-Harvest Physiology of Pepper (Capsicum Annuum L.)
(Mdpi, 2021) Cavusoglu, Seyda; Sensoy, Suat; Karatas, Arzu; Tekin, Onur; Islek, Firat; Yilmaz, Nurettin; Mlcek, Jiri
Peppers are cultivated in almost all provinces in Turkey, making up approximately 7% of the world's production. In this study, the effects of pre-harvest cytokinin application on the postharvest physiology of pepper (Capsicum annuum L.) fruits (cv. Akra and Melek F1) grown in ecological conditions in Turkey (Van, eastern Turkey) were investigated. During the growing period, organic cytokinin(nytrozine) at two concentrations (50 and 100 ppm doses) was applied by spraying. Peppers were harvested in green maturity and then stored at 12 degrees C for 28 days. Changes in color, respiration rate, exogenous ethylene amount, antioxidative enzyme analysis (SOD, CAT and APX), lipid peroxidation, total phenolic content (TP) and antioxidant activity (AA) were determined just after the harvest and then at the 7th, 14th, 24th and 28th days. L* values for both varieties and the control sample had fluctuations during storage, and they slightly decreased after 28 days, except for the end value of cv. Melek F1 with a 50 ppm addition. In terms of respiration rate values, the difference between applications was found to be statistically significant, except for the 14th and 24th days of storage, for cv. Akra F1; and the 0th and 28th days for cv. Melek F1, respectively. It was observed that cytokinin can delay aging in peppers of both cultivars stored for 28 days. As a result, as the used cytokinin has an organic origin, is not synthetic and does not have a negative effect on human health, it can be used safely and without a significant loss of quality characteristics for peppers. These applications have positive effects on in-package gas composition, antioxidative enzymes, lipid peroxidation, total phenolics and total antioxidant activity.
The Effects of 1-Mcp (1-Methylcyclopropene) and Edible Coating Materials on the Storage and Shelf Life of Red Chief Standart Apple Variety and Kirmizi Asli̇k, Pamuk Local Apple Varieties
(2023) Tekin, Onur; Çavuşoğlu, Şeyda
Çalışmada, Van ekolojik koşullarında yetiştirilen Pamuk Elma ve Kırmızı Aslik mahalli elma çeşitleri ile Red Chief standart elma çeşidinde 1-MCP (625 ve 1250 ppb 1-MCP), yenilebilir kaplama malzemesi (%2 jelatin ve %2 kitosan) ve kombin uygulamalarının (1-MCP+yenilebilir kaplama malzemesi) depo ve raf ömrü üzerine etkileri araştırılmıştır. Çalışmada; ağırlık kaybı, pH, suda çözünür kuru madde (SÇKM), titre edilebilir asitlik (TEA), meyve eti sertliği, meyve kabuk ve et rengi, solunum hızı, dışsal etilen miktarı, malondialdehit (MDA), polifenol oksidaz (PPO), toplam fenolik içeriği, toplam antioksidan kapasitesi, bireysel fenolik içeriği ve organik asitlerde meydana gelen değişimler araştırılmıştır. Önemli kalite kriterleri bakımından (ağırlık kaybı, pH, TEA, SÇKM, meyve eti sertliği, solunum hızı, dışsal etilen miktarı, MDA, toplam fenolik içeriği ve toplam antioksidan kapasitesi) her üç elma çeşidinde birinci (2019) ve ikinci (2020) yıl, depo ve raf ömründe kombin uygulamalarının %75 oran ile etkili olduğu, özellikle %22'lik oran ile %2 jelatin+625 ppb 1-MCP uygulamasının en etkili uygulama olduğu belirlenmiştir. Pamuk Elma ve Kırmızı Aslik mahalli elma çeşidinin 130 gün depo ve 130+7 gün raf ömründe, Red Chief standart elma çeşidinin 270 gün depo ve 270+7 gün raf ömründe kombin uygulamaları ile başarılı bir şekilde depolanabileceği belirlenmiştir. Depolama çalışmalarında mahalli elma çeşitleri yeterince yer almamaktadır. Mahalli elmalar ülkemizin önemli bir genetik zenginliği olup, yetiştiği bölgelerde sevilerek tüketilmektedir. Çalışmamamızda biyoaktif bileşenler açısından mahalli elmaların standart elma çeşitlerine göre daha zengin yapıda olduğu belirlenmiştir.
Effects of Edible Coating (Guar and Tara Gam) Applications on Post-Harvest Fruit Quality and Gene Expressions in Cherry Tomatoes
(Elsevier, 2025) Tekin, Onur; Karatas, Merve Dilek; Cavusoglu, Seyda
Post-harvest storage life of tomatoes (Solanum lycopersicum L.) is relatively short, posing a significant challenge in maintaining fruit quality. Addressing this challenge, our study aimed to evaluate the effects of 1.5 % guar gum and tara gum applications on post-harvest fruit quality and gene expression in Bamano and Yolita cherry tomato varieties cultivated under greenhouse conditions. The tomatoes were stored at 10 degrees C with 80 +/- 5 % relative humidity, and the study assessed changes in respiration rate, external ethylene production, in-package gas composition (O2 and CO2), organic acid content (citric acid, malic acid, succinic acid, tartaric acid, fumaric acid, and oxalic acid), and the expression of genes associated with respiration (LeAOX1a) and ethylene biosynthesis (LeACO1 and LeACS2). The findings revealed that 1.5 % guar and tara gum edible coatings effectively suppressed respiration rates and external ethylene production in both cherry tomato varieties. Additionally, these coatings regulated in-package gas compositions (O2 and CO2) and significantly contributed to the preservation of organic acids. Gene expression analysis indicated that in the Bamano variety, the expression levels of LeAOX1a and LeACS2 increased until the 24th day of storage, while LeACO1 expression levels rise until the 30th day. For the Yolita variety, the expression levels of respiration- and ethylene-related genes (LeAOX1a, LeACS2, and LeACO1) increased until the 24th day. In conclusion, the study demonstrated that 1.5 % guar gum edible coating effectively extended the post-harvest storage life of Bamano cherry tomatoes to 30 days and Yolita cherry tomatoes to 24 days, based on the evaluated parameters. These findings highlight the potential of guar gum coatings as a promising approach for improving the post-harvest quality and storage life of climacteric tomatoes.
Effects of Post-Harvest Uv-C and Hot Water Treatments on Quality Attributes of ‘0900 Ziraat’ Cherries Throughout the Cold Storage in Modified Atmosphere Packages
(2018) Bahar, Aşkın; Çavuşoğlu, Şeyda; Özrenk, Koray; Ercişli, Sezai; Tekin, Onur
In this study, effects of post-harvest UV-C, Hot Water and UV-C + Hot Water treatments on quality attributes and especially on phenolics of ‘0900 Ziraat’ cherries grown under Mersin Taurus Mountains conditions throughout the cold storage were investigated. For this purpose, before to store, cherry fruits were subjected to UV-C treatments for 5 minutes and Hot Water treatments at 50 °C for 1 minute. The fruits harvested at full-ripe period were then stored in modified atmosphere packages (MAP) (Xtend®) for 20 days at 0 oC temperature and 90±5% relative humidity. Throughout the storage period, weight loss, skin color, suspended solids content, titratable acidity, total phenolics and antioxidant analyses were performed in every 4th day of storage (0, 4, 8, 12, 16 and 20th days). Effects of experimental treatments on phenolics were investigated in detail. Present findings revealed that UV-C + Hot Water treatments without any chemicals better preserved the quality attributes and significantly restricted the losses in protocatechic acid, chlorogenic acid and q-coumaric acid contents.
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.
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.
Preserving Quality and Extending Shelf Life of Climacteric Persimmon Fruits Using Melatonin and Modified Atmosphere Packaging
(Wiley, 2025) Kucuker, Emine; Gundogdu, Muttalip; Guler, Emrah; Sumbul, Ahmet; Tekin, Onur; Hallac, Bulent
Quality and product losses during the postharvest storage of climacteric persimmon fruits pose significant challenges due to their short shelf life and limited marketing period. This study examined the effects of melatonin (1 mM) and modified atmosphere packaging (MAP) on preserving the quality, biochemical properties, and organic acid contents of persimmons, as well as extending their shelf life during storage at 0 degrees C +/- 0.5 degrees C. The MAP resulted in the lowest weight loss, recording only 6.63%. The combination of melatonin and MAP provided the highest fruit firmness at 8.69 kg/cm2, along with a total antioxidant level of 12.40 mu mol TE 100 g-1. Additionally, this treatment improved total phenolic content and most individual organic acids, except for fumaric acid, which was highest in the MAP treatment. The organic acid contents of the fruits varied during storage, depending on the specific acid. Malic acid was the predominant organic acid and was consistently better preserved by the treatments compared to the control. It is important to note that the reduction in malic acid was approximately 1.5 times less in the treated fruits than in the controls, while the decline of other organic acids was 3-4 times greater. In conclusion, both MAP and the combination of melatonin and MAP were effective methods for preserving the quality attributes and extending the shelf life of persimmon fruits.
Van Ekolojisinde Yetiştirilen Bazı Böğürtlen Genotiplerinin Fitokimyasal Özellikleri
(2019) Tekin, Onur; Türkoglu, Nalan; Berk, Selma Kuru; Taş, Akgül; Gündoğdu, Müttalip
Bu çalışmada, Van’ın Bahçesaray ekolojisindeki üç farklı böğürtlen genotipinin biyokimyasal bileşikleri tespit edilmiştir. Genotiplerde 5 farklı organik asit ve 8 farklı fenolik bileşik belirlenmiştir. Meyvelerde, fenolik bileşiklerden en fazla rutin (4.490 mg/g), organik asitlerden ise en fazla sitrik (1.132 g/100g) asit ön plana çıkmıştır. Sitrik asidi malik, süksinik, fumarik ve okzalik asit takip etmiştir. 65BS02 böğürtlen genotipi vanilik, rutin, gallik, klorojenik, kaffeik ve p-kumarik asit yönünden zengin bulunmuştur. Sonuç olarak genotipe bağlı olarak bileşenlerin değişkenlik gösterdiği görülmüştür. Ayrıca 65BS02 genotipi üstün özellikleri ile değer kazanan genotip olarak ortaya çıkmıştır.