Sürdürülebilir Kalkınma Amaçları
Yayınlar
- MakaleAçık Erişim2026Scopus SJRQ3Phenolic and antioxidant assessment of the flowers, stems, leaves, and fruits of Rosa pimpinellifolia and Rosa canina at different growth time
Öz, Mehmet; Okan, Onur Tolga; Baltaci, Cemalettin
Natural plants are abundant in their native habitats and are traditionally used to treat a variety of health conditions. The Rosa genus stands out as an important species rich in bioactive compounds. This study, conducted in Türkiye, aimed to analyse the antioxidant and phenolic profiles of methanolic extracts obtained from different parts of Rosa canina (R.c.) and Rosa pimpinelifolia (R.p.) collected in 2021 and 2022. The antioxidant activity values of R.c. collected in 2021 and 2022 were found to be between 5 102.31–46 396.36 mmol Fe(II)/100 g in ferric reducing antioxidant power (FRAP), 141.92–377.54 mg ascorbic acid equivalents (AA)/kg in total antioxidant capacity (TAC), 2.18–24.68 µg/g in 2,2-diphenyl-1-picrylhydrazyl [DPPH (EC50)] and 34.31–75.77% in DPPH (% inhibition). Antioxidant activity of R.p. collected in 2021 and 2022 ranged from 17 258.44–71 903.20 mmol Fe(II)/100 g, 271.69–479.19 mg AA/kg, 1.02–8.32 µg/g and 50.98–85.57% for FRAP, TAC, DPPH (EC50) and DPPH (% inhibition), respectively. The R.p. extracts generally exhibited higher antioxidant activity than those of R.c. Considering the total identified phenolic compounds achieved from different plant parts of rosehip for both years, the highest values of total phenolic compounds were determined in R.c. leaves (222.08 mg/100 g) in 2021, and R.p. leaves (5 465.95 mg/100 g) in 2021.
- MakaleAçık Erişim2026Scopus SJRQ2Biochemical Profiles of Three Bryophytes: Sphagnum papillosum, Rhytidiadelphus triquetrus, and Ditrichum gracile
Okan, Onur Tolga; Baltaci, Cemalettin
This study compared Sphagnum papillosum, Rhytidiadelphus triquetrus, and Ditrichum gracile in terms of total phenolic content (TPC), total flavonoid content (TFC), antioxidant activities (DPPH, ABTS, ferric reducing antioxidant power [FRAP]), phenolic profiles, fatty acid compositions, and mineral contents. S. papillosum had the highest TPC (986.11 mg GAE/kg) and ABTS activity (9732.14 mg Trolox/kg). R. triquetrus showed the highest TFC (874.01 mg QE/kg) and was rich in protocatechuic (18 803 mg/g) and 4-hydroxybenzoic acids (23.219 mg/g). Although D. gracile had lower antioxidant activity, it contained high lipid (6.71%) and ash (27.66%) levels, along with substantial potassium (73 573.86 mg/kg) and calcium (26 135.94 mg/kg) accumulation. Palmitic acid (C16:0) was the dominant fatty acid in all species. These results demonstrate significant biochemical variation among the studied mosses, underlining their potential as sources of natural antioxidants, bioindicators of environmental stress, and candidates for bioremediation.
- MakaleAçık Erişim2024Evaluation of Antioxidant Properties of Wild and Cultivated Blueberry Leaves and Their Phenolic Compound
Okan, Onur Tolga; Ulusoy, Esra; Öz, Mehmet; Deniz, Ilhan
Aim of study: This study aimed to investigate the antioxidant activity and polyphenol and flavonoid content of blueberry leaves, which could have positive effects on human health. Area of study: The research was conducted in three cities of Turkiye's Karadeniz region, where blueberry cultivation is prevalent: Giresun, Trabzon, and Rize. Material and method: In this study, 29 blueberry leaves (27 cultivated and two wild) were selected as sample materials. The total phenolic content (Folin-Ciocalteu method), total flavonoid content (aluminum (III) chloride method), and total antioxidant capacity (DPPH and FRAP) of the samples were analyzed. Phenolic characterization was performed using HPLC. Main results: The total phenolic content varied between 8.36 and 121.61 mg GAE/g, whereas the total flavonoid content ranged from 0.91 to 3.07 mg QE/g. The results revealed that blueberry leaves had high antioxidant activity and contained considerable amounts of polyphenols and flavonoids. Chlorogenic acid was identified as the dominant compound in all leaves samples. Research highlights: These findings indicate that blueberry leaves could be a valuable source of antioxidants in the food and cosmetic industries, comparable to the fruit itself.
AtıfWoS2OpenAlex2
İncele - MakaleYalnız künye2021Scopus SJRQ3Determination of the Chemical Composition, Antioxidant and Antimicrobial Activities of Different Parts of Rosa canina L. and Rosa pimpinellifolia L. Essential Oils
Öz, Mehmet; Deniz, Ilhan; Okan, Onur Tolga; Baltaci, Cemalettin; Karatas, Seyda Merve
Today, the use of essential oils is increasing day by day, and it is considered as raw materials in many industries. Therefore, this study aims to identify the essential oil profile, antioxidant and antimicrobial activity of Rosa canina L. and Rosa pimpinellifolia L. reveal their potential use in the industry. Essential oils that were obtained in 2013-2014 from different parts (flower, leaf, stem, and fruit) of Rosa canina L. and Rosa pimpinellifolia L. by the hydro-distillation method were analyzed by GC/MS. The dominant components in Rosa canina L. were found as trans-geraniol in the flowers (42.08 % for 2013), linalool in the leaves (11.55 % for 2014), and stem (14.91 % for 2013) and vitispirane in the fruits (37.19 % for 2014). The dominant components in R. pimpinellifolia L. were found as heneicosane in the flowers (22.07 % for 2014), γ-elemene in the leaves (30.21 % for 2013), linalool in the stem (14.76 % for 2013) and the fruits, (E)-2-hexenal for those collected in 2013 (14.09 %). The IC50 and FRAP values of the samples ranged from 127.54 to 142.22 μg/g and 121.43 to 296.78 μmol TE/g, respectively. According to the results obtained, both R. canina L. and R. pimpinellifolia L. were found to show poor antioxidant values of DPPH and FRAP. In general, it was determined that the essential oils obtained from different plant parts of both species had a moderate antimicrobial effect against Escherichia coli, Staphylococcus aureus, Bacillus subtilis, Bacillus cereus, and Pseudomonas aeruginosa.
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İncele - MakaleYalnız künye2020Determination of chemical composition, antioxidant and antifungal properties of pomegranate(Punica granatum L.) and Parsley (Petroselinum crispum) seed oil produced in industrial scale
Okan, Onur Tolga; İlhan, Hatice Deniz; Onaran, Abdurrahman; Kılıc Pekgözlü, Ayben; Öz, Mehmet
In this study, essential oil and oil acid content, antioxidant and antifungal properties of oils obtained from pomegranate (Punica granatum L.) and parsley seeds (Petroselinium crispum) produced on an industrial scale were investigated. Pomegranate seed oil was obtained cold pressed in an industrial scale, while parsley seed oil was obtained industrial steam distillation. As a result of pomegranate seed oil GC-MS analysis, fifteen components were determined. Parsley seed oil was twelve compounds was identified. Punicic acid (61.19 %) was found as the dominant compound in pomegranate seed oil while apiole (14.21 %) was determined as the dominant compound in parsley seed oil. When the antioxidant capacity of the oils were examined, it was determined that the oils obtained from pomegranate seeds have a moderate antioxidant activity, the oils obtained from parsley seeds have high antioxidant activity. Antifungal activity of pomegranate (Punica granatum L.) and parsley (Petroselinium crispum) seed oil against five different plant pathogens, Fusarium. oxysporum f. sp. lycopersici, Botrytis cinerea, Sclerotinia sclerotiorum, Alternaria. solani andRhizoctonia solani were also determined.
AtıfTR Dizin1
İncele - MakaleAçık Erişim2018Scopus SJRQ3Antioxidant activity, sugar content and phenolic profiling of blueberries cultivars: A comprehensive comparison
Okan, Onur Tolga; Deniz, Ilhan; Yayli, Nurettin; Şat, Ihsan Güngör; öz, Mehmet; Serdar, Gönül Hatipoğlu
Commercial blueberry production has been a viable industry throughout the world for 95 years; because of blueberry is a good source of antioxidant. Blueberries are especially rich in anthocyanin, a flavonoid with potent antioxidant capacity. The aim of this study was to compare the phenolic quantities, antioxidant activities, anthocyanin, sugar and phenolic compounds of blueberries produced in Turkey with those of similar blueberry varieties produced around the world. As a result of the conducted analysis, the total phenolic content (TPC) amount found in the berries was 77.26-215.12 mg GAE/100 g, the total flavonoid content (TFC) was 30.44-91.69 mg QE/100 g and the total anthocyanin content (TAC) was 43.03-295.06 mg c3- GE/100 g. Examining the antioxidant activities of the berries, DPPH between 1.10-5.65 mg/ml, FRAP between 454.93- 36832.96 μmol troloks/100 g, β-Carotene between 40.66-86.48%. It was determined that the natural berries contained much more phenolic compounds and higher antioxidant activity than that of the cultivars The result of HPLC analysis, chlorogenic acid is determined to be the dominant compound in all berries. Furthermore, fructose and glucose are found in all fruits in different quantities while sucrose is found in certain varieties of berries as well. At the end of the performed study the data indicate that wild and cultivars of blueberries are rich sources of antioxidants for local as well international industries importing this fruit for food processing and enormous products.
AtıfScopus70WoS69OpenAlex76İncele - MakaleAçık Erişim2015Scopus SJRQ2Chemical composition of oleoresin and larvae gallery resin of pinus brutia attacked by dioryctria sylvestrella ratz; [Kemijski sastav oleorezina i smole galerije ličinki sa stabla bora (pinus brutia) napadnutoga insektima dioryctria sylvestrella ratz]
Öz, Mehmet; Deniz, İlhan; Okan, Onur Tolga; Said Fidan, M.
Dioryctria sylvestrella Ratz. poses a remarkable hazard for the Pinus brutia Ten. in Turkey. In the current study, the larvae gallery resin of five trees and essential oils of resin, which was obtained with the AcidPaste Method, were analyzed using the Gas Chromatography and Mass Spectrometry (GC-MS) Method. Thirty nine compounds were found in larvae gallery resin, which were produced by Dioryctria sylvestrella Ratz, while thirty six compounds were extracted from oleoresin obtained by the Acid-Paste Method. The most common compounds of larvae gallery resin were α-pinene at a rate of 20.2%, β-caryophyllen at a rate of 10.8%, γ-terpinene at a rate of 10.1% and β-pinene at a rate of 9.4 percent. The most common compounds of oleoresin were α-pinene at a rate of 19.7%, β-pinene at a rate of 13.3%, γ-terpinene at a rate of 10.2% and β-caryophyllen at a rate of 7.8 percent. Also, the quantities of some compounds within larvae gallery resin such as β-pinene, limonene, and sylvestrene decreased compared to those of oleoresin, while the quantities of some compounds in oleoresin including α-longipinene, α-terpineol, and longifolene increased compared to that of larvae gallery resin. However, no qualitative difference was found.
AtıfScopus7WoS8OpenAlex11İncele - MakaleYalnız künye2013Antioksidan analiz yöntemleri ve Doğu Karadeniz Bölgesinde antioksidan kaynağı olarak kullanılabilecek odun dışı bazı bitkisel ürünler
Deniz, İlhan; Okan, Onur Tolga; Varlıbaş, Hülya; Oz, Mehmet
Doğu Karadeniz Bölgesi fiziksel ve farklı iklimsel özellikleri sebebiyle büyük bir genetik bitki çeşitliliğine sahiptir. Bu bitkiler, oksijen ve fotonların sebep olduğu oksidatif stresi önleyen potansiyel antioksidan kaynaklarıdır. Antioksidan bileşenlere ilgi son yıllarda artmıştır. Bunun sebebi, antioksidanlarca zengin gıdaların tüketme miktarı artırıldığında farklı dejeneretif hastalıklara yakalanma riskinin azaltılacağına inanılmasıdır. Bu çalışmada Doğu Karadeniz bölgesinde antioksidan kaynağı olarak kullanılabilecek ve ticareti yapılan 10 adet bitki seçilmiştir. Bu bitkilerin antioksidan aktiviteleri ile beraber potansiyel kullanım alanları incelenmiştir. Ayrıca antioksidan aktiviteye sebep olan bileşenler ile antioksidan tayin yöntemleri de tartışılmıştır.
AtıfTR Dizin18İncele - MakaleYalnız künye2013Antioxidant Analysis Methods and Some Non-Wood Forest Plant Products as Sources of Antioxidants in Eastern Black Sea Region
Okan, Onur Tolga; Varlibas, Hulya; Öz, Mehmet; Deniz, Ilhan
Eastern Black Sea region has wide genetically plant diversity due to physical and different climatic characteristic. These plants, which are potential source of antioxidants, prevent the oxidative stres caused by oxygen and photons at the same time. Interest of antioxidant compound has been increased for last years. The reason of this, it is believed that an increased intake of food, which is rich in natural antioxidant, is associated with a lower risk of degenerative diseases. In this study, 10 plants, which are sources of antioxidant and marketable in Eastern Black Sea region, were chosen. Antioxidant activity and potentials use area of these plants were examined. Moreover, antioxidant compounds and determination of antioxidant activity methods were discussed.
AtıfWoS15İncele
