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- MakaleAçık Erişim2026Scopus SJRQ1Effects of putrescine and MAP on quality, phenolics, and organic acids in strawberry tree fruits
Gundogdu, Muttalip; Yücel, Gül; Çolak, Ayşen Melda; Aglar, Erdal
Background: Strawberry tree (Arbutus unedo L.) fruits are rich in bioactive compounds but are highly perishable due to their high respiration rate and soft tissue structure, leading to rapid post-harvest quality losses. Therefore, developing sustainable strategies to maintain quality and extend shelf life is of great importance. Methods: In this study, the individual and combined effects of putrescine (1 mM) and modified atmosphere packaging (MAP) on the post-harvest quality and biochemical properties of strawberry tree fruits were investigated. Fruits harvested at full maturity were stored at 4 ± 1 °C and 90 ± 5% relative humidity for 15 days, and key quality parameters including weight loss, decay rate, respiration rate, soluble solids content, titratable acidity, vitamin C, organic acids, and phenolic compounds were periodically analyzed. Additionally, correlation analysis and principal component analysis (PCA) were performed to evaluate the relationships among variables. Results: Storage duration significantly increased weight loss and decay rate, while decreasing organic acids, vitamin C, and phenolic compounds (p ≤ 0.001). At the end of storage, weight loss reached 2.97% in control fruits, whereas it decreased to 1.14% in the Put + MAP treatment, representing a reduction of approximately 61.6%. Similarly, decay rate decreased from 6.55% (control) to 3.34% (Put + MAP). Respiration rate was also significantly suppressed, with the lowest values observed in the combined treatment. Furthermore, malic acid (1.38 vs. 0.80 g/100 g) and vitamin C (36.90 vs. 28.37 mg/100 g) were better preserved in Put + MAP-treated fruits compared to control at day 15. PCA results confirmed that Put + MAP treatment maintained the most balanced profile between quality attributes and biochemical stability. Conclusion: The combined application of putrescine and MAP exhibited a strong synergistic effect by simultaneously reducing respiration, limiting water loss and decay, and preserving bioactive compounds. This study demonstrates that integrating a natural bioregulator (putrescine) with an environmentally friendly packaging system (MAP) represents an innovative and practical approach for extending the shelf life and maintaining the nutritional quality of strawberry tree fruits. This strategy also has high potential for application in other highly perishable soft fruits.
- MakaleAçık Erişim2023Scopus SJRQ4Physicochemical and Phytochemical Properties of Different Extracts of Sumac Plant (Rhus coriaria L.) Grown in Tunceli, Türkiye; [Tunceli'de Yetişen Sumak Bitkisinin (Rhus coriaria L.) Farklı Ekstraktlarının Fizikokimyasal ve Fitokimyasal Özellikleri]
Yuksel, Esra; Ince, Olcay Kaplan
In this study, sumac plant (Rhus coriaria L.) naturally grown in Tunceli (Türkiye) was collected from 5 different provinces and investigated for their phytochemical properties. In sumac samples, pH, color, ash amount, total phenolic content (TPC), 2, 2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging capacity, metal chelating capacity, copper (II) ion reducing antioxidant capacity (CUPRAC), reducing power, mineral matter content, organic acids as tartaric acid, malic acid and citric acid, phenolic compounds as gallic acid, vanillic acid, caffeic acid, routine, resveratrol, (-)- epicatechin, and (+)- catechin hydrate contents were determined. The highest TPC was found in the acidified methanol extract (AME) and the DPPH free radical scavenging capacity was found in the acidified acetonitrile extract (AAE). It was determined that all extracts of sumac sample 5 (S5) collected from Pertek district, metal chelating capacity was higher than the other samples but lower than the metal chelating capacity of ethylene diamine tetra acetic acid (EDTA). CUPRAC was detected at the highest concentration of 118.0±3.0 mg caffeic acid equivalent kg-1 (mg CAE kg-1) in the AME, at the lowest 10.2±0.6 mg CAE kg-1 in the AAE for S5 sample. It was found that the reducing powers of all samples were found to be lower than the reducing power of synthetic antioxidants (butylhydroxytoluene (BHT), α tocopherol, and vitamin C), and the samples were rich in mineral substances, the predominant organic acid was malic acid, and phenolic compound was gallic acid.
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