Browsing by Author "Karakaya, Orhan"

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Changes in Quality Traits and Phytochemical Components of Blueberry (Vaccinium Corymbosum Cv. Bluecrop) Fruit in Response To Postharvest Aloe Vera Treatment
(Taylor & Francis inc, 2022) Ates, Umut; Islam, Ali; Ozturk, Burhan; Aglar, Erdal; Karakaya, Orhan; Gun, Sefa
The effect of Aloe vera application (33% and 66% as dipping, AV) on 'Bluecrop' blueberry's (Vaccinium corymbosum) quality properties such as weight loss, respiration rate, fruit color, soluble solids content (SSC), acidity, phytochemical components (vitamin C, total phenolics, and total flavonoids) and antioxidant activity was investigated during the cold storage (at 0 +/- 0.5 degrees C and 90 +/- 5% RH) for 28 days. During cold storage, significantly lower weight loss was recorded in fruit treated with AV compared to control. At the end of the cold storage, the weight loss was 20% lower in AV treated fruits and AV concentration was not effective in weight loss. On the contrary, the respiration rate (except for the 7th day) and fruit firmness were higher in these fruit. It was observed that color changes were less in AV-treated fruit during storage. In general, AV-treated fruit had significantly lower SSC, while acidity and vitamin C were higher. Moreover, 66% AV application was more effective in delaying the loss of vitamin C at the end of storage. During cold storage, 33% AV-treated fruit had significantly higher total phenolics (except day 28) and total flavonoids content compared to control. In the last two measurements of the cold storage, it was determined that fruit dipped in AV had higher antioxidant activity (both DPPH and FRAP assays) compared to control fruit. As a result, it was revealed that postharvest AV gel applications can be used as an effective postharvest tool to delay the loss of quality, the loss of phytochemical components and antioxidant activity of the blueberry fruit.
Effects of Ga3, Caci2 and Modified Atmosphere Packaging (Map) Applications on Fruit Quality of Sweet Cherry at Cold Storage
(Taylor & Francis inc, 2022) Ozturk, Burhan; Aglar, Erdal; Saracoglu, Onur; Karakaya, Orhan; Gun, Sefa
The aim of this study was to investigate the effects of pre-harvest gibberellic acid (GA(3)) and calcium chloride (CaCl2) and post-harvest modified atmosphere packaging (MAP) applications on fruit quality of sweet cherry during the cold storage. At the end of the cold storage, GA(3)+CaCl2 applications in MAP-applied fruit and CaCl2 in non-MAP-applied fruit significantly delayed weight loss compared to the control. During the cold storage, the decay of CaCl2-applied fruit has not been observed. At the end of cold storage, the a* and firmness values of the fruit treated with GA(3) and CaCl2 were significantly higher than the control. The CaCl2-applied fruit had less soluble solids than the control, but they had significantly higher acidity compared to other applications. In MAP, GA(3)- and CaCl2-applied fruit had higher vitamin C and antioxidant activity values than the control fruit, but their total phenolics were higher. However, the total flavonoids of CaCl2-applied fruit were higher than the control. On fruit in non-MAP, with GA(3) application, less anthocyanin was obtained compared to the control. As a result, GA(3)-treated fruit had a relatively lower bioactive compound content compared to the fruit of the CaCl2 and control applications both during the harvest and the cold storage. However, it has been revealed that GA(3) and CaCl2 applications can be used as significant pre-harvest tools to delay the loss of the fruit firmness.
The Influence of Fruit Size on Quality Attributes and Bioactive Compounds of Sweet Cherry Fruit
(Springer, 2023) Aglar, Erdal; Saracoglu, Onur; Ozturk, Burhan; Karakaya, Orhan; Ates, Umut
The study was carried out to determine the effect of different fruit sizes on the quality and bioactive compounds of sweet cherry (Prunus avium L. cv. '0900 Ziraat'). The fruit was harvested on the basis of Centre Technique Interprofessionnel des Fruits et Legumes (CTIFL) color category 5, mahogany. The fruit was separated for analysis according to the CTIFL scale: S21 (21 mm), S22 (22 mm), S24 (24 mm), S25 (25 mm), and S26 (26 mm). As the size of the fruit increased, the firmness decreased. The fruit color values varied depending on fruit size. It was determined that the increase in size of the fruit reduced the color values. The soluble solids content and vitamin C values occurred the differences with effect of fruit size. The increasing of fruit size occurred the decreasing in vitamin C content and the increase in the amount of soluble solids. The effect of fruit size on total phenolics, flavonoids, and antioxidant activity was significant. While the highest value of total phenolic content was obtained in S25, the lowest value was determined in S26. In both DPPH and ferric reducing antioxidant power assays, the lowest antioxidant activity was obtained in S26-sized fruit. The individual phenol with the highest concentration in sweet cherry was catechin, and p-coumaric was the individual phenolic with the lowest concentration. There were differences in the concentrations of individual phenolics between fruit sizes. However, it cannot be stated that fruit size had an effect on individual phenolic concentration because this effect was inconsistent.
Phytochemical and Antimicrobial Characteristics of Raspberry Fruit Growing Naturally in Kelkit Valley, Turkey
(Springer, 2023) Aglar, Erdal; Sumbul, Ahmet; Karakaya, Orhan; Erturk, Omer; Ozturk, Burhan
The study was carried out to determine the pomological, phytochemical and antimicrobial properties of wild raspberry fruit (Rubus idaeus) naturally growing in the Kelkit Valley in Turkey. In the study, the wild raspberry fruit was comparatively smaller. In fruit, soluble solids content (SSC) was determined as 12.6%, titratable acidity as 1.36% and vitamin C concentration as 28.8 mg 100 g(-1). Total phenolics, total flavonoids, 1,1-diphenyl-2-picrylhydrazil (DPPH) and ferric ions (Fe+3) reducing antioxidant power assay (FRAP) activity values were 1775 mg kg(-1), 151 mg kg(-1), 2580 mu mol kg(-1) and 5187 mu mol kg(-1), respectively. In the study, the solution obtained from raspberries had an antimicrobial effect on bacteria. While it had an antimicrobial effect on Aspergillus niger fungus, it did not have any effect on Candida albicans fungus. The highest antimicrobial activity was achieved against Pseudomonas aeruginosa, while the lowest effect was against Enterococcus feacalis bacteria. It was revealed that the raspberry fruit investigated in the study can be used as material for breeding studies due to their rich bioactive compounds and antimicrobial content.
Phytochemical Variation of Native Apple Germplasm Resources From the Eastern Black Sea Region, Turkey
(Springer, 2022) Balta, Mehmet Fikret; Karakaya, Orhan; Kurt, Haydar; Yilmaz, Muharrem; Uzun, Serkan; Balta, Fikri
In order to contribute more to human health, revealing the nutritional potential of fruit germplasm sources that have rich phytochemical compounds has gained importance today and has become one of the breeding objectives of various fruit species. Many nutritional components of wild apples have been considered as useful sources for apple breeding efforts, but studies on the phytochemical compounds of native apple genetic resources grown in local areas are limited. This study was carried out to investigate the phytochemical compounds of 19 native apple genotypes grown in Giresun in the eastern Black Sea region of Turkey and to compare them with those of three commercial varieties ('Granny Smith', 'Fuji', and 'Royal Gala'). The total phenolic contents of the genotypes ranged from 141.7 mg per 100 g (Yesilsut) to 1036.8 mg per 100 g (Cipir). Antioxidant activity was determined to be between 505.6 mu mol per 100 g (Ahmet) and 5041.8 mu mol per 100 g (Cipir). The total flavonoids ranged between 11.2 mg per 100 g (Beyaz) and 95.3 mg per 100 g (Maden). Uzun had the highest content of malic acid (15.33 g l(-1)) and tartaric acid (1.008 g l(-1)). The highest values for succinic acid and oxalic acid were detected in Cipir (1.192 g l(-1) and 0.484 g l(-1), respectively). Most of the native apple genotypes had higher levels of phytochemical compounds than those of standard apple cultivars. Principal component analysis showed that the phytochemical components could effectively explain the variability among the native apple genotypes, which exhibited wide variation in terms of phytochemical compounds. Most genotypes contained higher levels of phytochemical compounds than standard apple cultivars. The data imply that the native apple genotypes are an important source of phytochemical compounds and that native apple genotypes with higher contents of bioactive compounds can be used as genetic material for apple breeding programs. They might contribute to the development of new apple cultivars with enhanced health benefits.
Tocopherol Contents of Almond Genetic Resources From Eastern and Western Turkey
(Springer, 2019) Celik, Ferit; Balta, Mehmet Fikret; Ercisli, Sezai; Gundogdu, Muttalip; Karakaya, Orhan; Yavic, Adnan
This study was conducted in almond genetic resources selected from Eastern and Western Turkey. 71 (Prunus dulcis (Miller) D.A. Webb) genotypes were selected from Balikesir (Western Turkey) and Tunceli (Eastern Turkey) districts in 2012. Alpha (alpha)-tocopherol, gamma (gamma)-tocopherol, delta (delta)-tocopherol and alpha (alpha)-tocotrienols and total vitamin E content were investigated in the selected almond genotypes. 38 almond genotypes from Balikesir province had alpha-tocopherol, gamma-tocopherol, gamma tocopherol, alpha-tocotrienols and total vitamin E content to be from non detectable to 1164.36mg kg(-1) oil, non detectable to 130.03mg kg(-1) oil, non detectable to 81.38mg kg(-1) oil, non detectable to 1252.24mg kg(-1) oil, respectively. 33 almond genotypes from Tunceli district showed alpha-tocopherol, gamma-tocopherol, alpha-tocotrienols and total vitamin E content to be between non-detectable and 1085.92mg kg(-1) oil, non detectable and 21.12mg kg(-1) oil, non detectable and 91.26mg kg(-1) oil, 0.86 and 1191.81mg kg(-1) oil, respectively. Delta tocopherol content was not detectable in almond genotypes selected from Balikesir and Tunceli provinces. BKS-3, BKS-16 and TUN-15 genotypes showed higher tocopherol content in comparison to the other genotypes tested. We can say that these genotypes could be a useful source for the future breeding projects in developing almond cultivars with high tocopherol content.
Training System Plays a Key Role on Fruit Quality and Phenolic Acids of Sweet Cherry
(Springer, 2022) Karakaya, Orhan; Ozturk, Burhan; Aglar, Erdal; Gun, Sefa; Ates, Umut
In the study, the effects of different training systems (Steep Leader: SL, Spanish Bush: SB and Vogel Central Leader: VCL) on quality properties and bioactive components of "0900 Ziraat" sweet cherry fruit (Prunus avium L.) were investigated. The size, color and firmness values of the fruit varied depending on training system. The largest fruit was obtained in the SB training system. The fruit on trees trained VCL and SB had higher firmness than the fruit of trees trained SL. The color values of the fruit of VCL were higher than the other systems, while the vitamin C content was lower. The lowest acidity and soluble solids content (SSC) were measured in fruit trees trained SL. The highest values for bioactive compounds as phenolics, flavonoids were measured in fruit of SL training system. In the sweet cherry fruit, the major phenolic acid was catechin. The catechin, rutin, caffeic acid, 4-hydroxybenzoic acid, 4-aminobenzoic acid and transferulic acid content of the fruit in the SL training system were higher than those of SB and VCL. As a result, it was revealed that there is an effect of the training system on fruit quality; SB training system had higher values in terms of fruit size, whereas in terms of bioactive compound content, SL training system had higher values.
Training System Plays a Key Role on Fruit Quality and Phenolic Acids of Sweet Cherry (Feb, 10.1007/S10341-021-00621-2, 2022)
(Springer, 2022) Ates, Umut; Karakaya, Orhan; Ozturk, Burhan; Aglar, Erdal; Gun, Sefa