Browsing by Author "Uyak, Cuneyt"

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Biochemical Changes in Some Table Grape Cultivars Throughout the Ripening Process
(Univ Life Sciences Lublin, 2022) Dogan, Adnan; Uyak, Cuneyt
This study was conducted to investigate the biochemical changes observed throughout the ripening process from veraison to harvest periods of 13 table grape cultivars of Vitis vinifera L. species. Present findings revealed that total acidity, total phenolics and total antioxidant capacity of the grape cultivars decreased and water soluble dry matter (WSDM) content, must pH and total anthocyanins increased throughout the ripening process. In harvest period, water soluble dry matter (WSDM) contents varied between 17.0% (Trakya Ilkeren and Silfoni cultivars) and 21.6% (Kureys cultivar); total acidity values varied between 0.42 g l(-1) (Tekirdag Seedless cultivar) and 1.26 g l(-1) (Kizilatim cultivar); must pH values varied between 2.58 (Kohnu cultivar) and 3.29 (Trakya Ilkeren cultivar); ripening index values varied between 15.60 (Silfoni cultivar) and 41.90 (Tekirdag Seedless cultivar); total phenolics varied between 723.5 mu g GAE g(-1) (Mazirim cultivar) and 2657 mu g GAE g(-1) (Banazi Karasi cultivar); total antioxidant capacities varied between 4.27 mu mol TE g(-1) (Mazirim cultivar) and 8.21 mu mol TE g(-1) (Kohnu cultivar); total anthocyanins varied between 32.3 malvidin-3-o-glikozit mu g g(-1) (Kizilatim cultivar) and 205.2 malvidin-3-o-glikozit mu g g(-1) (Banazi Karasi cultivar). Berry skin colors strongly correlated with total phenolics (R-2 = 0.9376) and total antioxidant capacity (R-2 = 0.8296).
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.
Determination of Phenolic Compound and Organic Acid Contens of Some Grape Varieties Grown in Hizan (Bidis) Province
(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2020) Uyak, Cuneyt; Dogan, Adnan; Sensoy, Ruhan Ilknur Gazioglu; Keskin, Nurhan; Cavusoglu, Seyda; Cakmakci, Ozlem; Kunter, Birhan
Aim of this study was to determine phenolic compound and organic acid contents of 17 local grape varieties grown in Hizan (Bitlis) province of Turkey. Organic acid and phenolic compound amounts were determined via HPLC (High Performance Liquid Chromatography). Organic acids amount of grape varieties ranged from 1362.06 mu g g(-1) (Sapi Beyaz) to 4269.90 mu g g(-1) (Husni Beyaz) fortartaric acid and from1072.70 mu g g(-1) (Alaki) to 2858.69 mu g g(-1) (Kus Uzumu) for malic acid. Phenolic compound amounts of grape varieties ranged from 4.718 mu g g(-1) (Husni Beyaz) to 33.177 mu g g(-1) (Sapi Yesil) for gallic acid, from 6.293 mu g g(-1) (Beyaz Bineteti) to 20.201 mu g g(-1 )(Alaki) for vanilic acid, from 0.174 mu g g(-1 )(Beyaz Bineteti) to 2.830 mu g g(-1) (Alaki).for rutin, from 0.193 mu g g(-1) (Beyaz Bineteti) to 1.395 mu g g(-1 )(Kus uzumu) for protocatechuic acid, from 0.509 mu g g(-1) (Husni Beyaz) to 12.036 mu g g(-1) (Beyaz Guzane) for clorogenic acid, from 0.050 mu g g(-1 )(Siyah Guzane) to 0.485 mu g g(-1) (Husni Beyaz) for syringic acid, from 0.043 mu g g(-1) (Alaki) to 0.211 mu g g(-1) (Kirmizi Tayfi) for p-coumaric acid, from 0.041 mu g g(-1) (Beyaz Sinciri) to 1.238 mu g g(-1) (Siyah Guzane) for ferulic acid, from 0.023 mu g g(-1) (Beyaz Sinciri) to 1.083 mu g g(-1) (Kus Uzumu) for o(-)coumaric acid from 0.209 mu g g(-1) (Siyah Guzane) to 2.360 mu g g(-1) (Inek Memesi) for resveratrol, from 0.086 mu g g(-1) (Beyaz Sinciri) to 1.228 mu g g(-1) (Alaki) for florodiz.
Development of a Spatial Decision Support System (Sdss) for Grape Cultivation by Using a Geographical Information System (Gis): Çatak (Turkey) Example
(Springer, 2024) Guzel, Deniz Ugur; Dogan, Adnan; Uyak, Cuneyt
This study aims to develop a spatial decision support system (SDSS) by evaluating climate, soil, and topography factors together with the help of a Geographical Information System (GIS) and by using this modelled SDSS to determine the potentially suitable areas where grape varieties with different ripening levels within the study area (& Ccedil;atak, Turkey) can be grown. The study was carried out in the & Ccedil;atak district, located in the south of Lake Van, between 4080000 and 4240000 north latitudes and 300000 and 370000 east longitudes (UTM WGS84) in eastern Turkey in 2021-2022. In the study, some important individual factors for vine growing such as the effect of heat summation (EHS), number of frost-free days, minimum winter temperature, aspect, slope, soil depth, and land use capability were evaluated using the GIS and weighted notation ratio result method, and based on this, a suitability analysis was carried out. It was determined that the distributions of the study area for first, second, and third suitability levels, respectively, were 0.72-26.05-52.50% for the earliest variety, 4.58-33.84-48.28% for the early variety, 1.15-22.56-58.47% for the mid-early varieties, 3.95-20.52-49.07% for the mid-season varieties, and 1.18-13.20-44.61% for the late variety. It was seen that the variables and the modelling used were effective in determining suitable areas for grape cultivation.
Grapevine Leaf Area Measurements by Using Pixel Values
(Publ House Bulgarian Acad Sci, 2018) Dogan, Adnan; Uyak, Cuneyt; Keskin, Nurhan; Akcay, Anil; Sensoy, Ruhan Ilknur Gazioglu; Ercisli, Sezai
Determination of the leaf area has great importance in terms of plant development due to giving significant information about photosynthetic capacity of the plants. Leaf area measurements also reveal significant information about growth potential. Nowadays it can be done in laboratory and with portable expensive devices. The primary objective of the present study is to determine leaf areas in computer environment without a need for a special device and functional program only over the image pixel values and to put forth the availability of such method in leaf area measurements. In this study, real leaf areas of local grape varieties grown in Hizan (Bitlis) region were determined by using image processing technique of Photoshop CS6, pixel values and pixel-area relation. The accuracy of the measurement was determined as between 99.96-100.00%. It was concluded that Photoshop CS6 software was sufficient for leaf area measurements.
Multidimensional Investigation of the Effect of Pre-Treatment Solutions on Drying Characteristics and Raisin Quality
(Ankara Univ, Fac Agriculture, 2024) Yilmaz, Sahin; Uyak, Cuneyt
This study aims to evaluate the relationships between pre-treatment solution, variety, drying characteristics, and raisin quality in raisin production, using multivariate analysis methods. The study was conducted on raisins obtained by dipping Bineteti and Zeyti local seed grape varieties in 13 different pre-treatment solutions which were obtained by mixing potassium carbonate and sodium bicarbonate with olive oil, hazelnut oil, and sesame oil at different concentrations. The dipped grapes were dried in the sun on a concrete drying platform. In the study, data of 15 numerical variables related to drying characteristics and raisin quality were reduced to four principal components (PC1, PC2, PC3 and PC4) using the principal component analysis (PCA), and their score values were numerically obtained. Then, two grape varieties, 13 pretreatment solutions, and the four principal components were analyzed by non-linear principal component analysis (NLPCA). In addition, a cluster analysis was performed to determine the prominent pre-treatment solutions in terms of drying characteristics and raisin quality. It was determined that the pre-treatment solutions were effective on L*, a*, b*, chroma (C*), hue (h degrees), a/b values, antioxidant activity, total phenolic content, and drying time constituting PC1. It was remarkable that the colour parameters in prominent clusters in the cluster analysis also form PC1 in PCA analysis. The best pre-treatment solutions were found to be the "5% K2CO3 + 1% olive oil" solution for the Bineteti variety and the "5% K2CO3 + 2% hazelnut oil" solution for the Zeyti variety. It was determined that the pre-treatment solutions recommended for the varieties increased raisin quality and shortened the drying time, and had positive effects on the total phenolic content and antioxidant activity.
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
Relationships Between Physical and Chemical Properties With Stoma Properties in Some Local Grape Varieties (Vitis Vinifera L.)
(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2022) Arslan, Tuncer; Dogan, Adnan; Uyak, Cuneyt; Guzel, Deniz Ugur
The aim of this study was to determine the stoma densities and sizes of 12 local grape varieties grown in Yuksekova (Hakkari) province, as well as to determine the relationships between stomatal properties with physical and chemical properties. In order to determine stoma properties, leaf samples were taken from 4-5 th nodes of the summer shoots of each variety and stoma densities and sizes were determined by nail polish method from different parts of the leaf surface (bottom, middle, tip). It was determined that stoma densities were between 166.13-247.12 pcs mm(2), stoma lengths were between 22.63-27.88 mu m, and stoma widths were between 14.59-19.00 mu m. A significant positive correlation was found between stoma density with leaf size and cluster weight, and a significant negative correlation was found between stoma density with soluble solids content in grapes.