Browsing by Author "Kan, Tuncay"

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Effect of Sulfurizaton on Some Antioxidant Contents of Dried Apricot (Prunus Armeniaca L.)
(2009) Kan, Tuncay; Bostan, Saim Zeki
Kayısının insan sağlığı üzerine olumlu etkileri ve yüksek antioksidan madde içeriği ile ilgili çalışmalar mevcuttur. Bununla beraber kükürtlemenin kayısının bileşimindeki antioksidanlar üzerine etkilerini içeren kapsamlı bir araştırma bulunmamaktadır. Bu çalışma kayısıda geleneksel ve organik yetiştirme şekilleri, çeşit ve kükürtlemenin bazı polifenoller ve A vitamini içeriği üzerine etkilerinin karşılaştırılmalı olarak incelenmesini kapsamaktadır.Çalışmada geleneksel ve organik olarak yetiştirilen Hasanbey, Hacıhaliloğlu, Kabaaşı ve Zerdali çeşitlerinde taze, güneşte kurutulmuş ve kükürt uygulanmış örneklerde A vitamini ve fenolik maddeler olarak kateşin, epikateşin, klorogenik asit, kaffeik asit, p-kumarik asit, ferulik asit, kaemferol ve rutin düzeyleri HPLC ile tespit edilmiştir. Çalışma 2007 ve 2008 yıllarında yürütülmüştür.Elde ettiğimiz verilere göre fenolik madde ve A vitamini miktarları kayısı çeşidine bağlı olarak farklılık göstermiştir. Kükürtlemeden en çok Zerdali örnekleri etkilenmiş ve bazı numunelerinde klorogenik asit, kaffeik asit, p-kumarik asit, ve A vitamini hiç tespit edilememiştir. Ayrıca geleneksel ve organik olarak yetiştirilen kayısılarda kükürt miktarına bağlı olarak polifenoller ve A vitamini içeriğinde değişim görülmüştür. Her iki yılın örneklerinde organik olarak yetiştirilen kayısıların geleneksel olarak yetiştirilenlerden daha fazla fenolik madde ve A vitamini içeriğine sahip olduğu bulunmuştur. Geleneksel ve organik olarak yetiştirilen kayısı çeşitlerinin tümünde fenolik madde ve A vitamini düzeyleri işlem şekillerine göre Taze > Gün kurusu > Düşük kükürtlü > Yüksek kükürtlü şeklinde belirlenmiştir. Buna ilaveten bütün çeşitlerde p-kumarik asit en az, rutin ise en fazla bulunan polifenol olmuştur.
Fire Blight (Erwinia Amylovora) Resistant/Susceptibility of Native Apple Germplasm From Eastern Turkey
(Elsevier Sci Ltd, 2011) Ozrenk, Koray; Balta, Fikri; Guleryuz, Muharrem; Kan, Tuncay
This study aimed to determine the resistance/susceptibility to fire blight of apple germplasm resources from the province of Erzincan in eastern Turkey. In total, 32 native apple accessions from four regions within the province were tested under greenhouse conditions by inoculating the shoot tips with pathogenic bacterium. Shoot tips were wounded for inoculation. Genotypical susceptibility index (GSI%) values were computed for each genotype based on the length of the lesion that developed on each shoot. Accessions were grouped into five classes of resistance/susceptibility, as follows: Class A (resistant); Class B (moderately resistant); Class C (moderately susceptible); Class D (susceptible); and Class E (highly susceptible). GSI% values differed significantly among accessions (p < 0.01). Five accessions received a rating of Class A, and 7 accessions received a rating of Class B. This was followed by 9 accessions with a rating of Class C, 5 accessions with a rating of Class D and 6 accessions with a rating of Class E. The findings of this study are expected to contribute to breeding efforts with respect to apple resistance to fire blight. (C) 2011 Elsevier Ltd. All rights reserved.
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.
Phenolic Compounds and Vitamins in Wild and Cultivated Apricot (Prunus Armeniaca L.) Fruits Grown in Irrigated and Dry Farming Conditions
(Soc Biolgia Chile, 2014) Kan, Tuncay; Gundogdu, Muttalip; Ercisli, Sezai; Muradoglu, Ferhad; Celik, Ferit; Gecer, Mustafa Kenan; Zia-Ul-Haq, Muhammad
Background: Turkey is the main apricot producer in the world and apricots have been produced under both dry and irrigated conditions in the country. In this study, phenolic compounds and vitamins in fruits of one wild (Zerdali) and three main apricot cultivars ('Cataloglu', 'Hacihaliloglu' and 'Kabaasi') grown in both dry and irrigated conditions in Malatya provinces in Turkey were investigated. Results: The findings indicated that higher content of phenolic compounds and vitamins was found in apricot fruits grown in irrigated conditions. Among the cultivars, 'Cataloglu' had the highest rutin contents both in irrigated and dry farming conditions as 2855 mu g in irrigated and 6952 mu g per 100 g dried weight base in dry conditions and the highest chlorogenic acid content in irrigated and dry farming conditions were measured in fruits of 'Hacihaliloglu' cultivar as 7542 mu g and 15251 mu g per 100 g dried weight base. Vitamin C contents in homogenates of fruit flesh and skin was found to be higher than beta-caroten, retinol, vitamin E and lycopen contents in apricot fruits both in irrigated and dry farming conditions. Conclusion: The results suggested that apricot fruits grown in both dry and irrigated conditions had high health benefits phytochemicals and phytochemical content varied among cultivars and irrigation conditions as well. However, more detailed biological and pharmacological studies are needed for the demonstration and clarification of health benefits of apricot fruits.
Polyamines in Cold Storage: Impact of Postharvest Spermidine on Strawberry Quality
(Springer, 2024) Orman, Erdal; Yavic, Adnan; Gundogdu, Muttalip; Aglar, Erdal; Celik, Kenan; Kan, Tuncay
Reducing post-harvest losses of strawberries, which quickly spoil after harvest and have a limited storage life, is crucial in minimizing product wastage. The research aimed to investigate the impact of spermidine application at varying concentrations (0, 1.0, 1.5, and 2.0 mM) on post-harvest fruit quality characteristics and biochemical composition. Spermidine application protected the fruits by preventing changes in weight loss, decay rate, soluble solids content (SSC), titratable acidity (TA), pH ratios and respiration rate. Malic acid was dominant in strawberry fruits, and that the application of 2 mM spermidine (559.80 mg/100 g) compared to the control group (483.55 mg/100 g) largely preserved malic acid content. Chlorogenic acid was phenolics compound that had the highest content, and spermdine doses significantly preserved chlorogenic acid during storage. The study revealed that 2 mM spermidine application was the most effective dose and that it could be used at this concentration to preserve post-harvest fruit quality and reduce biochemical changes in strawberries.
Use of Spermidine To Preserve Organic Acids, Polyphenols, and Quality of Cold Stored Plum Fruits
(Academic Press inc Elsevier Science, 2023) Gundogdu, Muttalip; Guler, Emrah; Aglar, Erdal; Arslan, Tuncer; Kan, Tuncay; Celik, Kenan
One of the primary goals of fruit production and storage is to ensure pre-and post-harvest food quality. Polyamines have recently been used to improve food quality after harvest. We used spermidine concentrations of 0.5, 1, and 1.5 mM in plum fruits for 20 and 40 days of cold storage. Each dose provided significantly higher preservation of sensory properties, organic acids, and phenolic compounds than the control, with a gradual improvement by doses. Malic acid was the predominant organic acid and was gradually preserved by spermidine doses, including 25% more malic acid for the 1.5 mM spermidine treatment. Similarly, chlorogenic acid, the most abundant phenolic compound studied, was also 25% higher when the spermidine dose rose to 1.5 mM. The 1.5 mM spermidine notably inhibited weight loss and respiration rate. Organic acids and phenolic compounds were particularly protected by the 1 and 1.5 mM doses, and multivariate approaches suggested that spermidine has a comprehensive stability effect on secondary metabolites. This study proposes spermidine as a comprehensive metabolic preserver that protects polyphenols and organic acids, thus preserving the taste and healthiness of cold-stored plum fruits.
Van Gölü Havzası Yerel Armutları
(2010) Özrenk, Koray; Gündoğdu, Müttalip; Kan, Tuncay
Van Gölü havzasında yetiştirilen mahalli armut çeşitlerinin belirlenmesi amacıyla bu çalışma yapılmıştır. Bölgede uzun zamandan beri yetiştiriciliği yapılan bu yerel çeşitler yöre iklimine iyi adapte olmuş ve yetiştirildiği bölgede önemli bir Pazar payına sahip olan çeşitlerdir. Yetiştiriciliği yapılan mahalli çeşitlerin meyve özellikleri üzerinde yapılan bu araştırmada çeşitlere ait meyvelerin ağırlıkları, boyutları, suda çözünür kuru madde miktarları (SÇKM), titre edilebilir asit içerikleri gibi bazı pomolojik özellikleri belirlenmiştir. İncelenen çeşitlerde meyve ağırlığı 199.-20,07 g, meyve eti sertliği 13 - 3.07 lb, meyve sap uzunluğu 55.24 - 11.77 mm, titre edilebilir asit içeriği % 20.4 – 1.8, suda çözünür kuru madde miktarı % 17.80-10.5 arasında bulunmuştur.
Vitamins, Flavonoids, and Phenolic Acid Levels in Early- and Late-Ripening Apricot (Prunus Armeniaca L.) Cultivars From Turkey
(Amer Soc Horticultural Science, 2013) Gundogdu, Muttalip; Kan, Tuncay; Gecer, Mustafa Kenan
This study aimed at determination of vitamin (A, E, C, beta-carotene, and lycopene), phenolic, and flavonoid contents in apricots at different stages of ripening using high-performance liquid chromatography (HPLC). The effect of ripening in terms of phytochemical contents was investigated. Early period apricots showed 2.5 to three times higher level of vitamins (A, E, C, and beta-carotene, and lycopene) in all types of apricots than others (P < 0.05). Early-ripened cultivar, Boccuia, showed the highest level of vitamins, although a higher level of vitamin C was measured in late-ripened cultivar Levent (P < 0.05). No lycopenes were determined in late-period apricots in contrary to early- and middle-period apricots. Levels of phenolics and flavonoids were measured in all types (3-B-Q-D, procyanidin B1, B2, B3, caffeic acid, gallic acid, p-coumaric acid, epigallocatechine, catechine, epictechine, chlorogenic acid, ferrulic acid, and routine) and statistical deviation of all types was noted (P < 0.05). Among all, the cultivar Ozal showed the highest level of chlorogenic acid (45,843.00 mu g.g(-1) dry matter) in all ripening periods, where middle-ripened cultivar Adilcevaz showed the lowest level of p-coumaric acid (7.93 mu g.g(-1) dry matter content base).