Person: ŞENKARDEŞ, İSMAİL
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ŞENKARDEŞ
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İSMAİL
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Publication Metadata only Chemical characterization and pharmacological profile of tribulus terrestris extracts: A novel source of cosmeceuticals and pharmaceuticals(2023-04-01) ŞENKARDEŞ, İSMAİL; UYSAL Ş., ŞENKARDEŞ İ., Jekő J., Cziáky Z., Zengin G.© 2023 Elsevier LtdTribulus terrestris is widely used in traditional medicine and in dietary supplements. Therefore, this research aims to obtain comprehensive information on antioxidant properties, enzyme inhibitory activity and chemical composition of T. terrestris leaves. HPLC-MS/MS was used to further extensively characterize the chemical composition of T. terrestris extracts. 27, 75, and 51 chemical components were identifed in ethyl acetate, methanol and water extract, respectively. The radical scavenging activity results showed that water extract had the strongest acvitiy (DPPH: 30.50 mgTE/g, ABTS: 44.49 mgTE/g). The reducing power activity was assessed by FRAP and CUPRAC assays. The highest CUPRAC activity is shown by the ethyl acetate extract (79.01 mgTE/g). Water extract showed the highest metal chelating activity compared with other extract. In general, the highest antioxidant capacity were obtained in the water extract. Ethyl acetate extract exhibited the highest enzyme inhibition activity (AChE: 1.56 mgGAE/g; BChE: 2.14 mgGALAE/g; α-amylase: 0.73 mmolACE/g; Tyrosinase: 30.14 mgKAE/g) compared with other extracts. This research provides a scientific basis for the development of natural antioxidant and enzyme inhibiton sources from T. terrestris.Publication Open Access In vitro investigation of antimicrobial, enzyme inhibitory and free radical scavenging activities of Inula salicina L.(2022-09-01) YILDIRIM, AYBENİZ; ŞEN, ALİ; ŞENKARDEŞ, İSMAİL; BİTİŞ, LEYLA; Yıldırım A., ŞEN A., HACIOĞLU M., BİRTEKSÖZ TAN A. S. , ŞENKARDEŞ İ., BİTİŞ L.In this study, in vitro biological activities and total phenol/flavonoid contents of methanol extract (ISM) and its hexane (ISH), chloroform (ISC), ethyl acetate (ISEA) and aqueous methanol (ISAM) fractions obtained from aerial parts of Inula salicina were investigated. ISEA showed the highest antioxidant activity against DPPH and ABTS radicals with an IC50 value of 0.014 mg ml-1 for both assays. ISEA exhibited a good anti-inflammatory activity with an IC50 value of 0.060 mg ml-1 . ISEA was found to exhibit a moderate level of antidiabetic activity against α amylase enzyme with an IC50 value of 0.290 mg ml-1 . ISEA and ISM presented low and moderate inhibitory activity against acetylcholinesterase and butyrylcholinesterase enzymes with IC50 values of 0.577 and 0.279 mg ml-1 , respectively. ISC with MIC values of 78 and 156 µg ml-1 displayed a significant antimicrobial activity against Staphylococcus aureus and S. epidermidis, respectively. Almost all extracts had moderate effect against Candida species. The highest total phenolic and flavonoid contents were determined in ISEA with 574.8 mg GAE (gallic acid equivalent) g -1 extract and 30.48 mg QE (quercetin equivalent) g -1 extract, respectively. These results showed that ISEA had a good antioxidant and anti-inflammatory activity with moderate α-amylase and butyrylcholinesterase inhibitory activity. Also, ISC exhibited a significant antimicrobial activity against Staphylococcus species.Publication Open Access Novel Signposts on the Road from Natural Sources to Pharmaceutical Applications: A Combinative Approach between LC-DAD-MS and Offline LC-NMR for the Biochemical Characterization of Two Hypericum Species (H. montbretii and H. origanifolium)(2023-02-01) ŞENKARDEŞ, İSMAİL; Sut S., Dall’Acqua S., Zengin G., ŞENKARDEŞ İ., Uba A. I., Bouyahya A., Aktumsek A.© 2023 by the authors.The members of the genus Hypericum have great potential to develop functional uses in nutraceutical and pharmaceutical applications. With this in mind, we aimed to determine the chemical profiling and biological properties of different extracts (ethyl acetate, methanol and water) from two Hypericum species (H. montbretii and H. origanifolium). We combined two approaches (LC-DAD-MS and LC-NMR) to identify and quantify chemical compounds of the extracts. Antioxidant properties (free radical quenching, reducing power and metal chelating) and enzyme inhibitory effects (cholinesterase, tyrosinase, amylase and glucosidase) were determined as biological properties. The tested extracts were rich in caffeic acid derivatives and flavonoids, and among them, 3-caffeoyl quinic acid and myricetin-3-O-rhamnoside were found to be the main compounds. The total phenolic and flavonoid levels were determined to be 50.97–134.99 mg GAE/g and 9.87–82.63 mg RE/g, respectively. With the exception of metal chelating, the methanol and water extracts showed stronger antioxidant properties than the ethyl acetate extracts. However, different results were obtained for each enzyme inhibition assay, and in general, the ethyl acetate extracts present more enzyme-inhibiting properties than the water or methanol extracts. Results from chemical and biological analyses were combined using multivariate analysis, which allowed establishing relationships between composition and observed effects of the Hypericum extracts based on the extraction solvents. To gain more insights between chemical compounds and enzyme-inhibiting effects, we performed molecular docking analysis. We observed favorable interactions between certain compounds and the tested enzymes during our analysis, confirming the data obtained from the multivariate approach. In conclusion, the obtained results may shed light on the road from natural sources to functional applications, and the tested Hypericum species may be considered potential raw materials, with promising chemical constituents and biological activities.