Sürdürülebilir Kalkınma Amaçları
Yayınlar
- MakaleAçık Erişim2025Kuzgun Barajı’nda (Erzurum) Yaşayan Squalius semae Turan, Kottelat & Bayçelebi, 2017 Türünün Kas Dokularındaki Yağ Asidi Kompozisyonunun Belirlenmesi
Özçiçek, Esin; Kocabaş, Mehmet; Kutluyer Kocabaş, Filiz; Ökkeş; Yılmaz, Okkes; Yilmaz; Ozmen, Gorkem Kirmizikaya
Bu çalışmada, Kuzgun Barajından yakalanan Squalius semae kas dokusundaki yağ asidi profili, gaz kromatografisi kullanılarak belirlenmiştir. Çalışma sonucunda, 9 doymuş yağ asidi (SFA), 10 tekli doymamış yağ asidi (MUFA) ve 7 çoklu doymamış yağ asidini (PUFA) içeren toplam 26 yağ asidi tespit edilmiştir. Sonuçlarımız kas dokusundaki çoklu doymamış yağ asitlerinin (PUFA) (%46,49) doymuş yağ asitlerine (SFA) göre daha yüksek oranda bulunduğunu göstermiştir ve bunu MUFA'lar (%28,01) ve SFA'lar (%25,5) izlemiştir. Palmitik asit (C16:0) (%16,19) ana doymuş yağ asidiyken, dokosaheksaenoik asit (DHA, C22:6 n−3) (%13,75) ile eikosapentaenoik asit (EPA, C20:5 n−3) (%12,18) ana çoklu doymamış yağ asidi olarak belirlenmiştir. Sonuç olarak, S. semae besin açısından insan tüketimi için değerlidir ve tüketici tarafından alternatif besin kaynağı olarak tüketilebilir.
- MakaleAçık Erişim2023The Antioxidant Capacities and Antimicrobial Activities of Some Salvia L. Seeds
Ökkeş; Yılmaz, Okkes; Yilmaz; Kurşat, Murat; Kirbag, Sevda; Civelek, Şemsettin; Emre, Irfan; Sönmez, Pınar Erecevıt; Emre, Mustafa Yunus
The goal of present study is to find the penolic contents, antioxidant activities and antimicrobial capacities in the seeds of five Salvia L. taxa two of which are endemics (Salvia euphratica var. leiocalycina and Salvia euphratica var. euphratica). The flavonoid and phenolic acid are determined by using HPLC while the antioxidant activities are determined based on different methods. Also, the antimicrobial activities of some Salvia species are determined by using the well agar method. The current study found that the studied Salvia species have low flavonoid. It has been found that Salvia euphratica var. euphratica has high vanillic acid, ferulic acid and rosmarinic acid among the studied taxa. Similarly, it has been found that Salvia euphratica var. euphratica has high DPPH and ABTS radical scavening capacity in all concentrations. It has been also found that Salvia euphratica var. euphratica has highest total phenolic content (372,63±0,87 µgGAE/mg) whilst Salvia tricholoda has low total phenolic content (46,41±1,71 µgGAE/mg). In addition, this study demonstrated that Salvia tricholoda has lowest metal chelating activity (37,35±0,51%). Furthermore, present study found that the lipid peroxidation levels of the studied Salvia taxa are between 18,21±0,37 mg/kg and 21,03±0,22 mg/kg while it has been found that the antibacterial properties of the Salvia taxa under study are altering.
AtıfOpenAlex1TR Dizin1
İncele - MakaleAçık Erişim2022Bazı Dicranum Hedw. Türlerinin Biyokimyasal Özellikleri
Alataş, Mevlüt; Batan, Nevzat; Ökkeş; Yılmaz, Okkes; Yilmaz; Emre, Irfan; Demirbağ, Mustafa; Yıldırım, Vesile
Bu çalışmada, beş farklı Dicranum türünün (D. majus, D. fuscencens, D. polysetum, D. scoparium ve D. tauricum) yağ asidi bileşimleri, yağda çözünen vitaminler, steroller, flavonoidler ve fenolik asit seviyeleri ile DPPH radikal yakalama aktiviteleri incelenmiştir. Yağda çözünen vitaminler, steroller, flavonoidler ve fenolik asitler HPLC ile değerlendirilirken, yağ asidi bileşimleri gaz kromatografisi ile değerlendirilmiştir. Çalışma bulgularına dayanarak, incelenen Dicranum türlerinin düşük düzeyde flavonoidler ve yağda çözünen vitaminler sergiledikleri belirlenmiştir. Fakat incelenen türlerin fenolik asitler açısından yüksek olduğu görülmüştür. Özellikle incelenen türlerin önemli düzeyde gallik asit (52,96-63,1 g/g) ve vanilik asit (11,96-44,83 g/g) içerdiği belirlenmiştir. Sinnamik asit konsantrasyonu ise incelenen örneklerde en düşüktür. Bu çalışmada incelenen türlerin radikal yakalama kapasiteleri 250 μl'de %48,92 ile %86,89 arasında değişmektedir. Ayrıca incelenen türlerin stigmasterol içeriklerinin 35,3 ile 46,05 g/g arasında değiştiği saptanmıştır. En düşük ergosterol ve beta-sitosterol seviyeleri ise D. majus ve D. fuscescens'te bulunmuştur. Yağ asidi bileşimi sonuçlarına göre; oleik asit (C18:1 n9), linoelik asit (C18:2 n6) ve -linolenik asit (C18:3 n3)'ün baskın doymamış yağ asitleri, palmitik asit (C16:0) ve behenik asit (C22:0) ise başlıca doymuş yağ asitleridir.
AtıfOpenAlex6TR Dizin2İncele - MakaleAçık Erişim2019Assessment of vitamin compositions and cholesterol levels of carp (Cyprinus carpio carpio) and rainbow trout (Oncorhynchus mykiss) caviars
Emir Çoban, Özlem; Ökkeş; Yılmaz, Okkes; Yilmaz; Emine; İnanlı, Ayşe Gürel; Kuzgun, Nermin Karaton
In this study, roes obtained from carp (Cyprinus carpio carpio) that were caught from Keban Dam Lake (Elazığ) and the culturedrainbow trout (Oncorhynchus mykiss) were processed as caviar and compositions of proximate and vitamins, cholesterol levels were determinedin the products. In the research, roes obtained from mature fish were processed under aseptic conditions by suitable procedures for differentfish species. The obtained caviars were weighed as 75 grams and filled in 200 ml capped glass jar and stored in +4 ºC for 28 days.As a resultof the analysis in the study, the amount of dry matter was determined to be 35.94% in roes obtained from rainbow trout and 31.28% in roesobtained from carp. The average protein content in raw roe obtained from rainbow trout was determined to be 24.32%, it was determined tobe 18.25 % in carp. In this study, the fat content in roes obtained from rainbow trout was determined to be 9.14%, but it did not show muchchange during processing and it was determined to be 8.84% in the end product. During the production and storage of the caviar producedfrom rainbow trout and carp, the fat-soluble vitamin composition and cholesterol levels were determined. During the study, it was found thatthe amounts of vitamin A between rainbow trout and carp caviars were significantly different (p <0.001). Vitamins D and K were not detectedin the caviar samples. As a result of analyzes, cholesterol levels were determined 73.76 mg/100 g in rainbow trout roe and 10.82 mg/100 g incarp roe and it was observed that these values were not changed significantly during the processing and storage periods (on 0th, 7th, 14th, 21stand 28th days ).
AtıfOpenAlex7TR Dizin1İncele - MakaleYalnız künye2013Scopus SJRQ3Antioxidant activity, total phenolic and flavonoid content of water and ethanol extracts from achillea millefolium l
Türkoğlu, Semra; Keser, Serhat; Çelık, Sait; Türkoğlu, İsmail; Ökkeş; Yılmaz, Okkes; Yilmaz
Achillea millefolium (Asteraceae, yarrow) has been used in folk medicine against several disturbances including skin inflammations, spasmodic and gastrointestinal disorders. In this study, ethanol and water extracts were prepared from A. millefolium flowers, leaves and seeds. Antioxidant activities were measured by ferric thiocyanate method, and H2O2radical scavenging activity assays and phenolic compounds and flavonoid contents of A. millefolium extracts were also determined. In conclusion, extracts of A. millefolium flowers, leaves and seeds had effective H2O2radical scavenging activity, total antioxidant activity, and these antioxidant activities were compared with BHA and ?tocopherol as reference antioxidants
AtıfTR Dizin4İncele - MakaleYalnız künye2011Yoncanın toklularda kas ve kuyruk yağ dokularındaki retinol, a-tokoferol ve kolesterol düzeyleri üzerine etkisi
Seven, Pinar Tatli; Gürdoğan, Fuat; Benzer, Fulya; Erişir, Zeki; Seven, Ismail; Bahşi, Muammer; Özçelik, Mehtap; Kılınç, Ünal; Ökkeş; Yılmaz, Okkes
In this study, the effects of fresh, ensiled or dried alfalfa on retinol, a-tocopherol and cholesterol levels in yearling sheep were investigated. In the study, 40 Akkaraman male yearling sheep, 4 months of age and an average body weight of 21 kg, were used. All diets used in the present study were prepared as isonitrogenous and isoenergetic. The alfalfa forms used in rations composed the experimental groups. With regard to groups were fed with wheat straw as roughage was Control group (C-Group) or fed with fresh alfalfa was AF group, ensiled alfalfa was AS group and dried alfalfa was AD group. Retinol levels in muscular and tail adipose tissue were found to be higher in alfalfa feeding groups compared to control group. The highest a-tocopherol level in deltoideous muscle tissue was detected in AF group. Cholesterol levels in muscular and tail adipose tissue were found to be lower in alfalfa feeding groups compared to control group.As a conclusion it can be said that, decrasing cholesterol levels in yearling sheep by feeding with alfalfa, is extremely important for human beings that consume red meat, as it can reduce the risk of coronary heart diseases.