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    Biochemical and quality parameters changes of green sweet bell peppers as affected by different postharvest treatments
    (Academic Journals, 2010) Sakaldas, Mustafa; Kaynas, Kenan
    In this research, the effects of different postharvest treatments on quality and biochemical properties of Maxibell F1 California Wonder type peppers at green mature stage were determined. In this content, ultraviolet C (UV-C) at 254 nm treatments for 2.5, 5, 10 min and hot water dipping (HWD) treatments for 2 min at 40, 50, 60 degrees C were done respectively. Besides, low density polyethylene (LDPE) and polyvinylchloride (PVC) based modified atmosphere packaging (MAP) applications were materialized. Some quality and biochemical parameters such as flexibility, soluble solids content, weight loss, decay incidence, ascorbic acid content, total chlorophyll content and membrane leakage were assessed after each storage period on peppers. Furthermore, the gas concentrations inside modified atmosphere packages were daily measured. Treated peppers were stored at 6 - 7 degrees C and 90 - 95% RH conditions for 15, 30 and 45 days with two days shelf life at 18 - 20 degrees C respectively. According to the results, storage period affected the quality and biochemical properties. Thus, quality and biochemical properties reduced with prolonged storage period. Furthermore LDPE based MAP, PVC based MAP and HWD at 40 degrees C were found successful in terms of keeping the parameters as mentioned, respectively. The differences between treatments became evident especially after 30 and 45 days storage.
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    Effect of Controlled and Modified Atmosphere on Storage Quality of Cauliflower(Brassica oleracea L. var. botrytis cv. Iglo) Heads
    (2020) Kaynas, Kenan; Çiftci, H. Nihan
    Cauliflower (Brassica oleracea L., var. botrytis cv Iglo) heads with jacked leaves were stored in air, in PE bags (perforated and nonperforated), in PVC wrapped and in CA (3% O2 + 3% CO2) at 1°C and 90 – 95% RH for 60 days. Shelf life was tested after 3 days at 20°?. Changes in chemical composition and external quality of heads were determined during storage. Increase in SS, losses of acidity and ascorbic acid of air stored heads were higher than those stored in CA or MA. The carbohydrate content of heads was slightly higher in CA and MA. The decomposition of carbohydrates slowed down in CA or MA storage. The better external quality was obtained from those stored in CA or in PVC wrapped during storage and shelf life. From these findings it was concluded that cauliflower heads can be held for 3 weeks in air or PE bags and storage life can be extended up to 6 weeks by CA or PVC wrapped applications.
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    Farklı Koşullarda Depolanan ANET 30 Şeftali Çeşidinin Aroma Bileşenlerindeki Değişimler
    (2022) Kaynas, Kenan; Gündoğdu, Mehmet Ali; Kıyı, Hulusı; Akturk, Cemre; Yaman, Şevket
    Bu çalışma, özel sektör (Anadolu Etap-Çanakkale) meyve bahçelerinde üretilen ANET 30 şeftali çeşidi meyvelerinin depolanmaları süresince aroma bileşenlerindeki değişimin saptanması amacıyla yapılmıştır. Bu kapsamda meyveler, Kontrol, Xtend® torbalar içerisinde modifiye atmosfer paketleme (MAP), hasattan sonra 625 ppb dozunda 1-Metilsiklopropan (1-MCP) uygulanmış ve 1-MCP + MAP olmak üzere, 4 farklı şekilde 0±1°C sıcaklık ve %90±5 oransal nem koşullarında 60 gün süreyle depolanmış ve 20 gün arayla aroma bileşenlerindeki değişim saptanmıştır. Çalışmadan elde edilen bulgulara göre; ANET 30 meyvelerinde önemli aroma bileşeni aldehitler olarak saptanmış, depolamanın başlangıcında ortalama %81.33 olan toplam aldehitler depolama süresince azalarak %64.91 oranına düşmüştür. Ancak bu azalmanın derecesi uygulamalara göre farklılık göstermiştir. Aldehitler dışında laktonlar, alkoller, esterler, terpenler ve diğer aroma bileşenleri olarak saptanmış ve bunların depolama süresince değişimleri farklılık göstermiştir. Depolama süresi uzadıkça terpenler, laktonlar ve esterlerde önemli, alkollerde kısmen artış tespit edilmiş, bunlar dışındaki aroma bileşenler içerisinde hekzenlerde azalma saptanmıştır. Şeftali aromasını veren laktonlardaki artış 60 günlük depolama sonunda %150 oranına ulaşmıştır. Olgunluk ilerledikçe özgün aromayı veren bileşiklerde artış, aldehitlerde azalma saptanmıştır. Depolamanın başlangıcında 13 adet olan ana aroma bileşenlerin sayısı depolama süresince artış göstererek uygulamalara göre 19-30 sayısına ulaşmıştır. Aroma bileşenlerinin oluşumu depolama uygulamaları farklı düzeylerde gecikmiştir.
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    POSTHARVEST HANDLING OF FRUIT AND VEGETABLES IN TURKEY
    (Univ Agricultural Sciences & Veterinary Medicine Bucharest, 2016) Kaynas, Kenan
    Turkey is the unique country that has land in both Europe and Asia. Turkey has approximately 75 000 000 population and is an agricultural country. In this context Turkey has great fruit and vegetable production potential. Turkey is one of the biggest producers of apples, pears, quinces, peaches and apricots, citrus (as fruit species) and tomatoes, peppers, melons, watermelons (as vegetable species). However, the amount of cold stores and packinghouses is deficient for its potential. Moreover the export rate is 5-10% of production. In addition the rate of postharvest losses of these crops is approximately 35-40%. On the other hand, the usage of controlled atmosphere (CA) stores and new postharvest technologies debouched rapidly. As a result increasing the amount of CA stores and modern packinghouses, arranging the errors in cold chain and improving the reproducing conditions will make Turkey an important fresh perishable exporter. Besides, the potential and capacity of production will be validated by minimizing the postharvest losses. On the other hand, cave storage will be improved by some modifications such as temperature, humidity and air circulation conditions. Their numbers, and hence capacities are steadily increasing. Eventually, the cave stores have impressions as being the predominating stores for citrus, potatoes and onions.
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    The effects of modified atmosphere packaging and storage temperature on quality and biochemical properties of dill (Anethum graveolens) leaves
    (Wfl Publ, 2010) Sakaldas, Mustafa; Aslim, Arzu S.; Kuzucu, Canan O.; Kaynas, Kenan
    Fresh herbs have very short storage period after harvest. In this context we determined the effects of different modified atmosphere packaging applications for prolonging the shelf life of dill (Anethum graveolens L. cv. Asder) leaves. For this purpose, the performances of modified atmosphere packaging based on polyvinylchloride (PVC) and low density polyethylene (LDPE) was examined at different storage temperatures (0-1 degrees C and 45 degrees C) with 90-95% RH for 10,20 and 30 days with 1 day shelf life at 18-20 degrees C/50-55% RH, respectively. Some quality parameters, such as weight loss, color, visual quality (graded to scale) and soluble solids content (SSC), besides some biochemical parameters, such as vitamin C, total phenolics and total chlorophyll content, were evaluated on dill bunches. In addition, the atmosphere composition inside the packages was measured daily. Quality and biochemical parameters, such as color, visual quality, weight loss, vitamin C, total chlorophyll content and total phenolic compounds, were affected by modified atmosphere packaging (MAP) and storage temperature. Furthermore, there was a difference between applications, moreover the atmosphere composition inside the packages was found different. Modified atmosphere packaging based on low density polyethylene was fixed as the most successful application on dill leaves and pursued by modified atmosphere packaging based on polyvinylchloride (PVC). Moreover, 0-1 degrees C storage temperature was more effective as keeping the quality of the crop. The effects of MAP based on both PVC and LDPE reduced at 4-5 degrees C storage temperature. As a result, MAP based on LDPE at 0-1 degrees C storage temperature was confirmed as the best method for prolonging the shelf life of dill leaves with keeping the quality.
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    The response of Cyclamen hederifolium to water stress induced by different irrigation levels
    (2009) Yildirim, Murat; Akcal, Arda; Kaynas, Kenan
    The purpose of this study was to examine the effects of different irrigation levels on morphological and physiological parameters of Cyclamen hederifolium. Irrigation applications was scheduled as 40% of the available water was depleted in the root zone in the full irrigation and intended to refill the root zone up to field capacity. In the deficit treatments, water was applied in the range of 75% (I.75), 50% (I.50) and 25% (I.25) of the full irrigation. Deficit irrigation regimes reduced the applied water at the average rates of 17, 37 and 50%, respectively. Although the highest amount of applied water was in the Ir0 treatment, deficit irrigation application of I.50 (114 mm water applied) exibited good development on some morphological and physiological characters of C. hederifolium; leaf area index (LAI), water use effi ciency, and also tuber development were the highest in the treatment of I.50. Our results clearly indicate that more than 114 mm irrigation water is an excessive water application, adversely less than that amount has negative effects on the morphological and physiological parameters of the bulbs of C. hederifolium. © 2009 Academic Journals.