Person: DOĞAN, AHMET
Loading...
Email Address
Birth Date
Research Projects
Organizational Units
Job Title
Last Name
DOĞAN
First Name
AHMET
Name
3 results
Search Results
Now showing 1 - 3 of 3
Publication Open Access Antioxidant, Enzyme Inhibitory and Calcium Oxalate Anti-crystallization Activities of Equisetum telmateia Ehrn.(2020-09-15) TAŞKIN, TURGUT; DOĞAN, AHMET; TAŞKIN T., YILMAZ B. N., DOĞAN A.Equisetum L. is the only genus of the Equisetaceae family, which commonly known as horsetails, in English and atkuyruğu or kırkkilit in Turkish. In traditional medicine, Equisetum telmateia Ehrh. is used in diseases of the urinary system, such as pyelonephritis, prostatic hypertrophy, and cystitis. Besides, this species is known to be used by humans to treat kidney stones or kidney sand. The extracts were obtained from the aerial parts of the E. telmateia using three different extraction methods (maceration, Soxhlet, ultrasonic bath) and their antioxidant (ABTS, CUPRAC), anti-urease and anticholinesterase activities were examined. Also, calcium oxalate anti-crystallization activity of Soxhlet methanol extract showing strong antioxidant activity was determined. Soxhlet methanol extract exhibited stronger ABTS radical scavenging (0.0676 mM Trolox/mg extract) and cupric ion reducing/antioxidant (4.351 mM Trolox/mg extract) activity than other extracts. Soxhlet methanol (65.528%) and maceration methanol (61.965%) extracts showed the strongest anticholinesterase activity. In the anti-urease assay, it was found that Soxhlet petroleum ether extract (15.302%) had the highest anti-urease activity. Furthermore, the data obtained showed that the Soxhlet methanol extract had high efficacy in the nucleation and aggregation phase of calcium oxalate crystals. These results prove that Soxhlet methanol extract has antioxidant, anticholinesterase and anti-crystallization capabilities. Therefore, this extract can be used in the future as an antioxidant and anticholinesterase agent as well as the treatment and / or prevention of stone formation.Publication Open Access In vitro biological activities of different extracts from alcea dissecta(2022-03-01) TAŞKIN, TURGUT; DOĞAN, AHMET; TAŞKIN T., Kahvecioglu D., Turkoglu E. A., DOĞAN A., Kuzu M.Objective: Alcea genus belongs to Malvaceae family and this genus is represented by 85 taxa in the world and 21 taxa in the Flora of Turkey. The flowers of Alcea genus contain plenty of mucilage and are used for the treatment of respiratory diseases such as asthma and cough. Alcea dissecta is known as ‘Govik, Hiro, Hero’ in Turkey, and the flowers and leaves of this species have been used in the treatment of asthma, injury, colds, and gastrointestinal diseases in Turkey. To the best of our knowledge, there is no report on the effect of extraction methods on the biological activity of this plant. In addition, although this species is being used as a medical plant, there is no study of the antioxidant, antiurease, esterase, and anticholinesterase activity of the plant. Therefore, the aim of this study was to evaluate in vitro antioxidant, anti-urease, esterase, anticholinesterase activities of Alcea dissecta using a variety of extracts. Methods: The antioxidant activities of different extracts were examined by DPPH, ABTS, FRAP, and CUPRAC methods. The total phenolic compounds contained in the extracts were determined using the Folin-Ciocalteu reagent (FCR) method. Anti-urease and anticholinesterase activities of different extracts were evaluated by indophenol and Ellman methods respectively. In addition, esterase activities of plant extracts were determined. Results: In the present study, ethanol:water (1:1, v/v) and chloroform extracts obtained maceration method showed stronger DPPH and ABTS radical scavenging activity than other extracts. The chloroform extract obtained Soxhlet method was found to have higher FRAP and CUPRAC values than other extracts. It was also found that the ethanol extract obtained maceration method showed the most potent anti-urease and anticholinesterase activity. According to the results, the strongest inhibitory effect on both hCA I and II isoenzymes was shown by the petroleum ether extract obtained Soxhlet method. Conclusion: As a result, it was determined that different plant extracts have antioxidant, anti-urease, esterase, anticholinesterase activities. In addition, the data obtained from this study will shed light on future research on the biological activities of this species.Publication Metadata only Investigation of biological activities of Paranchia kurdica subsp. kurdica var. kurdica and analysis of major phytochemicals by HPLC-DAD(2021-11-24) TAŞKIN, TURGUT; RAYAMAN, ERKAN; DOĞAN, AHMET; Ermanoğlu M., Taşkın D., Taşkın T., Rayaman E., Doğan A.