Browsing by Author "Tas, Akgul"

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Effect of Salicylic Acid on Quality Attributes, Phenolic and Organic Acid Stability in 'Angeleno’ Plums During Cold Storage
(BMC, 2025) Celik, Kenan; Yavic, Adnan; Cakmak, Sevgi Sumerli; Colak, Aysen Melda; Tas, Akgul; Gundogdu, Muttalip
BackgroundIn the present research, plum fruits were subjected to pre-storage treatments with salicylic acid at concentrations of 0.5, 1.0, and 1.5 mM, followed by storage durations of 15, 30, 45 days. A control group, without any treatment, was stored under the same conditions. Throughout storage, various parameters including weight loss, fruit firmness, decay and respiration rate, soluble solids content (SSC), titratable acidity (TA), pH, phenolic compounds, organic acids, vitamin C levels were evaluated.ResultsFindings revealed that untreated fruits exhibited greater increases in weight loss, SSC, pH, decay, and respiration rates, along with a marked decrease in firmness over time compared to the salicylic acid-treated groups. The TA values in salicylic acid-treated fruits demonstrated variation dependent on the storage interval. In this study, 1.0 mM and 1.5 mM salicylic acid applications were more prominent in terms of physical properties. In the 1.0 mM salicylic acid application, lower weight loss (45th day: 3.60%), decay (45th day: 6.44%), and respiration (45th day: 43.12 mg CO2 kg-1 h-1) rates, and higher fruit firmness (45th day: 31.76) were observed compared to control fruits. Among the treated groups, fruits treated with 1.5 mM salicylic acid retained higher levels of phenolic compounds and organic acids. Moreover, all salicylic acid treatments were effective in preserving vitamin C better than the control. The most prevalent organic acid identified in plums was malic acid (45th day: 258.73 mg 100 g-1), with citric (45th day: 31.01 mg 100 g-1) and succinic (45th day: 26.88 mg 100 g-1) acids following in concentration. Chlorogenic acid (45th day: 8.65 mg 100 g-1) was the predominant phenolic compound, with gallic acid (45th day: 3.62 mg 100 g-1) and p-coumaric acid (45th day: 2.85 mg 100 g-1) ranking next.ConclusionsOverall, the 1.5 mM salicylic acid treatment showed the greatest efficacy in maintaining quality attributes during storage. In 1.5 mM salicylic acid application, fruit firmness increased by 20.15% and weight loss and respiration rate decreased by 54.44% and 39.93%, respectively, compared to control group fruits after 45 days of storage.
Physicochemical Substances and Bioactive Components of Wild Cornelian Cherry (Cornus Mas L.) Fruits in Erzincan Province of Eastern Turkey
(Serbian Genetics Soc, 2023) Ozrenk, Koray; Tas, Akgul; Gundogdu, Muttalip; Keskin, Nurhan; Ercisli, Sezai
Turkey has a very rich flora due to diverse climatic and topographic conditions within the country. Cornelian cherry (Cornus mas L.) is an important wild edible fruits and widely distributed in Turkey and well known for its fruit antioxidants and nutrients. In this study, phytochemical content in fruits of a number of Cornelian cherry genotypes in Erzincan region were determined. The biochemical analysis included organic acids, sugars, vitamin C, antioxidant and individual phenolic compounds. In the study, organic acid content was between 253.09 mg/100 g and 112.50 mg/100 g. Vitamin C content varied between 115.85 mg/100g and 43.77 mg/100 g. Likewise, the sugar content of Cornelian cherry fruits varied from 6.17 g/100 g to 4.06 g/100 g. When the antioxidant content was examined, the highest antioxidant was 980.91 limol TE/g fresh weight (FW) base and the lowest was 490.38 limol TE/g FW. In the genotypes examined, gallic acid was determined as the highest among the individual phenolic compounds, while the individual phenolic amounts ranged from 38.93 mg/100 g FW to 4.31 mg/100 g FW. As a result of the study, it was determined that Cornelian cherry fruits are very rich in vitamin C and other phytochemicals and as a result of this examination, 24ER04 and 24ER08 genotypes came to the fore.
Role of Polyamines in Post-Harvest Storage: Influence of Post-Harvest Putrescine Treatment on Quality Properties and Specific Biochemical Contents of Cornelian Cherry Fruit
(Elsevier, 2024) Tas, Akgul; Gundogdu, Muttalip; Berk, Selma; Kibar, Hakan; Uyak, Cuneyit
In this study, postharvest 0.3 mM, 0.5 mM and 1.0 mM putrescine doses were applied to cornelian cherry fruit, which is a climacteric fruit, and the fruit were stored for 45 days. Putrescine applications maintained fruit quality criteria by preventing changes in weight loss, soluble solids content (SSC), acidity and respiration rate. Putrescine 1.0 mM dose prevented the degradation of phenolic compounds, organic acids, and vitamin C contents in cornelian cherry fruit. In the application of 1.0 mM dose of putrescine (45 days), malic acid was determined as 64.07 g kg-1, vitamin C as 13.20 mg 100 g-1 and citric acid as 11.42 g kg-1. As a result of storage, it was observed that the most effective dose preventing the degradation of phenolic acids (chlorogenic acid 9.73 mg 100 g-1; ocoumaric acid 3.78 mg 100 g-1; ferulic acid 2.43 mg 100 g-1) was 1.0 mM putrescine application. The most effective doses on flavonoids were found to be 1.0 mM (rutin), 0.5 mM (catechin) and 0.3 mM (quercetin). As a result, it was concluded that the exogenous application of putrescine can be used as a post-harvest tool to preserve the quality and storage life of cornelian cherry fruit.