Person: ŞEN, ALİ
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ŞEN
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ALİ
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Publication Metadata only A new eudesmanolide from Tanacetum balsamita L. and biological activities of extracts(TAYLOR & FRANCIS LTD) ŞEN, ALİ; Servi, Huseyin; Goren, Nezhun; Sen, Ali; Servi, Esra YildirimThe ethyl acetate and methanol extracts from aerial parts of Tanacetum balsamita yielded a new derivative of 1-acetyl-erivanin, namely 1-acetyl-3-epi-erivanin (17), some known compounds, namely seventeen sesquiterpene lactones, five flavonoids, four coumarins, and a steroid. All extracts displayed antibacterial activity against test microorganisms except for Escherichia coli. The methanol (TBM) extract with an IC50 value of 0.180 mg/mL exhibited good antioxidant activity against DPPH radical while all extracts showed significant anti-inflammatory activity against lipoxygenase enzyme. The ethyl acetate (TBEA) extract presented moderate activity against alpha-glucosidase enzyme with an IC50 of 0.808 mg/mL. The highest total phenol content with 91.050 mg GAE/g extract was found in TBM. It is the first study on the isolation of secondary metabolites as well as 5-lipoxygenase and alpha-glucosidase inhibitory activity of T. balsamita growing in Turkey.Publication Metadata only THERAPEUTIC POTENTIAL OF MYRTUS COMMUNIS SUBSP COMMUNIS EXTRACT AGAINST ACETIC ACID-INDUCED COLONIC INFLAMMATION IN RATS(WILEY, 2017) ŞEN, ALİ; Sen, Ali; Yuksel, Meral; Bulut, Gizem; Bitis, Leyla; Ercan, Feriha; Ozyilmaz-Yay, Nagehan; Akbulut, Ozben; Cobanoglu, Hamit; Ozkan, Sevil; Sener, GokselThe aim of this study was to evaluate the effect of ethanol extract from leaves of Myrtus communis subsp. communis (MC) on acetic acid (AA)-induced ulcerative colitis in rats. On the fourth day of colitis induction, all rats were decapitated. Colitis was assessed by macroscopic and microscopic scores and by measuring malondialdehyde (MDA) and glutathione (GSH) levels, myeloperoxidase (MPO) activity, luminol, lucigenin, nitric oxid and peroxynitrite chemiluminescence (CL). Colitis caused significant increases in the colonic MDA levels, MPO activity, CL values, macroscopic and microscopic damage scores along with significant decrease in tissue GSH level. However, treatment with MC extract reversed all these biochemical indices, as well as histopathological alterations induced by AA with the protective effects being similar to that of sulphasalazine treatment. The study showed that MC extract could alleviate colitis in rats and can be considered an alternative therapeutic approach for management of inflammatory bowel diseases (IBD).Publication Metadata only Investigation of possible neuroprotective effects of some plant extracts on brain in bile duct ligated rats(WILEY, 2021) ŞEN, ALİ; Ozel, Armagan Begum; Cilingir-Kaya, Ozlem Tugce; Sener, Goksel; Ozbeyli, Dilek; Sen, Ali; Sacan, Ozlem; Yanardag, Refiye; Yarat, AysenThis study aimed to investigate the possible neuroprotective effects of bitter melon (BM), chard, and parsley extracts on oxidative damage that may occur in the brain of rats with bile duct ligation (BDL)-induced biliary cirrhosis. It was observed that lipid peroxidation (LPO), sialic acid (SA), and nitric oxide (NO) levels increased; glutathione (GSH) levels, catalase (CAT) activity, and tissue factor (TF) activity decreased significantly in the BDL group. However, in groups with BDL given BM, chard, and parsley extracts LPO, SA, NO levels decreased; GSH levels and CAT activities increased significantly. No significant differences were observed between groups in total protein, glutathione-S-transferase, superoxide dismutase, and boron. Histological findings were supported by the biochemical results. BM, chard, and parsley extracts were effective in the regression of oxidant damage caused by cirrhosis in the brain tissues. Practical applications Bitter melon (BM), chard, and parsley have antioxidant properties due to their bioactive compounds which are involved in scavenging free radicals, suppressing their production, and stimulating the production of endogenous antioxidant compounds. Since BM, chard, and parsley extracts were found to be effective in the regression of oxidant damage caused by cirrhosis in the brain tissues, these plant extracts may be an alternative in the development of different treatment approaches against brain damage in cirrhosis. At the same time, these species have been used as food by the people for many years. Therefore, they can be used safely as neuroprotective agents in treatment.Publication Open Access Flavonoids and biological activities of various extracts from Rosa sempervirens leaves(TAYLOR & FRANCIS LTD, 2017-03-04) ŞEN, ALİ; Bitis, Leyla; Sen, Ali; Ozsoy, Nurten; Birteksoz-Tan, Seher; Kultur, Sukran; Melikoglu, GulayRosa sempervirens L. (Rosaceae) growing wildly in Turkey is used in folk medicine for various indications. Here, we report the isolation of four flavonoids and determination of the total phenolic and flavonoid contents and the antimicrobial and antioxidant activities of various extracts from R. sempervirens leaves. Antioxidant activity was determined by 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2'-azinobis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS). The total phenolic and flavonoid contents were determined using the Folin-Ciocalteu and AlCl3 methods, respectively. The antimicrobial activity was evaluated by the broth microdilution method against seven microbial species. The ethyl acetate extract (E) had significant antioxidant activity with half maximal inhibitory concentration (IC50) values of 3.96 in the DPPH and 2.92 mg/mL in the ABTS assay. The total phenolic (203.8 mg gallic acid equivalents/g extract) and total flavonoid (95.81 mg catechin equivalents/g extract) contents of the E extract were significantly higher as compared to other extracts. The E extract exhibited strong antimicrobial activity against Candida albicans with a minimum inhibitory concentration of 39 mg/mL. Quercetin 3-xyloside, quercitrin and hyperoside were isolated from the E extract and quercetin, from the chloroform extract, and quercetin and hyperoside were identified for the first time in this species. Quercitrin was found to be a major compound in the E extract. Antimicrobial activity of R. sempervirens was also reported for the first time. These results indicate that the E extract has significant antioxidant and antimicrobial activity, probably due to flavonoids as well as other phenolic compounds in the E extract, acting individually or in combination.Publication Metadata only Chemical composition and biological activities of endemicTripleurospermum conoclinium(Boiss. & Balansa) Hayek essential oils(WILEY, 2020) DOĞAN, AHMET; Servi, Huseyin; Sen, Ali; Dogan, AhmetThe volatile oils of flowers (TFE), leaves (TLE) and stems (TSE) ofTripleurospermum conoclinium(Boiss. & Balansa) Hayek were obtained by hydrodistillation method for 3 hours with Clevenger-type apparatus. Chemical composition of oils was determined by GC-MS analyses. Antidiabetic, anti-inflammatory and antioxidant activities of oils were tested by alpha-glucosidase inhibitory, 5-lipoxygenase inhibitory and DPPH/ABTS radical scavenging methods, respectively. Eighty-five constituents were identified in flower oil (78.3%). The major compounds of flower oil were artemisia ketone (10.5%), beta-oplopenone (6.0%), tricosane (4.5%), terpinen-4-ol (3.7%) and artemisia alcohol (3.5%). Sixty-two constituents were identified in leaf oil (67.0%). 1-octadecanol (11.5%), caryophyllene oxide (5.7%), elemol (3.9%), phytol (3.5%), ledene oxide (3.3%) and artemisia ketone (3.1%) were found as main constituents in the leaf oil. Forty-six constituents were determined in the stem oil (75.1%). The main compounds of the stem oil were 1-octadecanol (11.1%), beta-oplopenone (5.5%), ledene oxide (5.5%), caryophyllene oxide (4.4%) and phytol (3.0%). TLE and TSE displayed strong antidiabetic activity with IC(50)values of 21.30 and 29.57 mu g/mL against alpha-glucosidase enzyme, respectively. TLE showed the best anti-inflammatory activity with an IC(50)value of 91.02 mu g/mL while TFE and TSE exhibited moderate activity with IC(50)values of 186.50 and 257.10 mu g/mL, respectively. TFE and TLE were found to possess moderate antioxidant activity with IC(50)values of 572.80 and 385.80 mu g/mL against ABTS radical while all essential oils showed weak activity against DPPH radical. To the best of our knowledge, this is first report on chemical composition and biological activities ofTconocliniumessential oils.Publication Open Access Chemical composition and biological activities of essential oils of Foeniculum vulgare Mill. and Daucus carota L. growing wild in Turkey(MARMARA UNIV, 2021) DOĞAN, AHMET; Servi, Huseyin; Sen, Ali; Servi, Esra Yildirim; Dogan, AhmetThe chemical composition of essential oils of aerial parts of Daucus carota (DEO) and Foeniculum vulgare (FEO) was specified by GC/MS. Antidiabetic, anti-inflammatory, antioxidant, and antibacterial activities of oils were tested by alpha-glucosidase inhibitory, 5-lipoxygenase inhibitory, DPPH/ ABTS radical scavenging, and broth microdilution methods, respectively. Thirty components were identified in DEO (87.7%). Carotol (27.7%), elemicin (18.1%), and limonene (16.0%) were determined as the main compounds in DEO. Seventeen constituents were identified in FEO (100.0%). Estragole (34.0%), limonene (27.1%), and alpha-pinene (19.5%) were found as major components in FEO. Both oils displayed weak antibacterial activity against Gram-negative bacteria. However, the oils were not effective on Grampositive bacteria. DEO with IC50 values of 1359 and 1579 mu g/mL and FEO with IC50 values of 3106 and 1654 mu g/mL showed weak antioxidant activities against DPPH and ABTS radicals, respectively. DEO and FEO exhibited good antilipoxygenase activities with IC50 values of 87.24 and 58.35 mu g/mL, respectively. DEO presented significantly alpha-glucosidase inhibitory activity with an IC50 value of 44.78 mu g/mL while FEO displayed poor activity with an IC50 value of 1%7 mu g/mL. This study is the first report on the 5-lipoxygenase and alpha-glucosidase inhibitory activities of aerial parts of DEO as well as on the alpha-glucosidase inhibitory activity of aerial parts of FEO. These results indicated that DEO, which has a good antidiabetic and anti-inflammatory activity, is rich in oxygenated sesquiterpene and monoterpene. Also, it showed that FEO, which has a significant anti-inflammatory activity, is rich in monoterpene and phenylpropanoid.