Sürdürülebilir Kalkınma Amaçları
Yayınlar
- MakaleAçık Erişim2026Scopus SJRQ1Ultrasonic-Assisted Deep Eutectic Solvent Extraction of Polyphenols From Tea Parts: A Green Assessment
Gerçek, Yusuf Can; Baştürk, Fatma Nur; Gıdık, Betül; Abca, Tuğba Elbir; Yurtvermez, Bayram; Fuente-Ballesteros, Adrián; Kutlu, Naciye; Ecem Bayram, Nesrin
Deep eutectic solvents (DESs) have emerged as green alternatives to conventional solvents for extracting bioactive compounds from plants. This study evaluated nine choline chloride–based DESs for recovering antioxidant polyphenols from four parts of the tea plant (Camellia sinensis): seed, bud, leaf, and flower. Total phenolic content, antioxidant activity, and individual polyphenolic profiles were determined, and the greenness of the sample preparation was assessed using AGREEprep. The highest total phenolic content (53.28 mg GAE/g) and antioxidant activity (141.17 mg TE/g) were obtained from leaves using ChCl:formic acid, outperforming ethanol and methanol. Leaves also exhibited the highest total quantified polyphenolic content (up to 95,813 mg/kg DW, corresponding to the sum of the quantified polyphenols), with epicatechin gallate and gallocatechin + epigallocatechin being the major contributors. Flowers and buds showed notable polyphenolic diversity, while seeds contained the lowest levels. Statistical analysis confirmed clear clustering patterns according to plant part and solvent type. AGREEprep evaluation yielded scores up to 0.54, highlighting the environmental benefits of DES-based extraction. We demonstrated that tea leaves were the richest source of bioactive polyphenols, and selected DESs, particularly formic acid–based and ethylene glycol–based, exhibited superior efficiency and sustainability compared to conventional solvents. These findings support the wider adoption of DESs for green, high-yield extraction of pharmacologically important compounds from tea and other medicinal plants.
- MakaleAçık Erişim2025Rize Çay Bahçeleri İçin Tehdit Oluşturan Türkiye İçin Yeni Bir İstilacı Bitki Kaydı: Begonia cucullata Willd. var. hookeri (A.DC.) L.B.Sm. & B.G.Schub
Sefali, Abdurrahman; Demir, İbrahim; Yapar, Yakup; Keser, Ali Murat; Yurtvermez, Bayram
Bir alanın biyolojik çeşitliliği mevcut doğal envanterin devamlılığı için önemlidir. Benzer şekilde tarım alanlarında verimi üst düzeyde tutabilmek insanoğlu için zorunluluk haline gelmiştir. İstilacı bitkiler biyolojik çeşitliliği ve tarımı, olumsuz etkilemektedir. Bu çalışmaya konu olan Begonia cucullata Willd. var. hookeri (A.DC.) L.B.Sm. & B.G.Schub taksonu, Rize ilindeki bazı çay (Camellia sinensis (L.) Kuntze) bahçelerinde doğal yollarla yayılmaya başladığı tespit edilmiştir. Yerel düzeyde çay bahçelerinin ekonomik ve tarımsal önemi göz önünde bulundurulduğunda, bu kaydın ne denli önem arz ettiği görülmektedir.
- MakaleYayıncıda açık erişim2025Scopus SJRQ2Primula longipes subsp. bayburtensis Sefali, Yapar & Demir (Primulaceae): A new taxon from north-eastern Anatolia, Türkiye
Sefalı, Abdurrahman; Yapar, Yakup; Demir, İbrahim; Yurtvermez, Bayram; Keser, Ali Murat
The new taxon, Primula longipes subsp. bayburtensis Sefali, Yapar & Demir, subsp. nov. (Primulaceae) is described and illustrated from Bayburt Province, Türkiye. It is morphologically assigned to Primula sect. Crystallophlomis based on its long scapes, lanceolate and denticulate leaf with long petiole and hairless habit, fruits longer than calyx and covered by farina on the scape. This new taxon is similar to Primula longipes and P. nivalis subsp. turkestanica; it can also be easily distinguished by its calyx divided ratio, thurm flowers (unwidened corolla tube shape and length) and capsules (length) futures.
