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Now showing 1 - 10 of 25
  • PublicationMetadata only
    Synthesis of New Oleanane Triterpenoids Including Fatty Acids Esters and Investigation of Their in vitro Cytotoxic Effects on 3T3 Fibroblast and PC3 Prostate Cancer Cell Lines
    (2019-12-19) Dağ, Aydan; Topçu, Gülaçtı; Atasoy, Sezen; Aktaş, Asude Sena; Şenol, Halil; ŞENOL, HALIL; DAĞ, AYDAN; ATASOY, SEZEN; TOPÇU, GÜLAÇTI
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    Preclinical studies evaluating the therapeutic efficacy of novel natural compound olean-12-en-28-ol, 3β pentacosanoate for multiple sclerosis
    (2022-09-26) Şenol H.; Özgün-Acar Ö.; Dağ A.; Eken A.; Acar B.; Aktaş Pepe N.; Güner H.; Aykut Z. G.; Çevik Kaplan S.; Ayaz Güner Ş.; et al.; ŞENOL, HALIL; DAĞ, AYDAN; TOPÇU, GÜLAÇTI
  • PublicationMetadata only
    Importance of Functional Foods in Brain Health
    (2023-03-19) Topçu G.; TOPÇU, GÜLAÇTI
  • PublicationMetadata only
    Di-, and Triterpenoids Isolation and LC-MS Analysis of Salvia marashica Extracts with Bioactivity Studies
    (2021-11-01T00:00:00Z) Toraman, Gulbahar O. Alim; Aydin, Sibel Kiran; Ertas, Abdulselam; Boga, Mehmet; EROL, EBRU; Saygi, Tuba Kusman; Halfon, Belkis; TOPÇU, GÜLAÇTI; EROL, EBRU; ALİM TORAMAN, GÜLBAHAR ÖZGE; TOPÇU, GÜLAÇTI
    In this study, dichloromethane, acetone, and methanol extracts of the aerial parts of the Salvia marashica plant which is an endemic species to Anatolia, were investigated. The total phenolic amounts of these extracts were determined as pyrocatechol equivalent and total flavonoids as quercetin equivalent. Antioxidant activity was determined by four complementary methods including inhibition of lipid peroxidation (by beta-carotene color expression), DPPH free radical scavenging activity, ABTS cation radical scavenging activity and CUPRAC methods. Anticholinesterase activity of the extracts was investigated by the Ellman method against acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) enzymes. Viability and cytotoxic activity tests were carried out on the fibroblast L929 cells and cytotoxic A549 lung cancer cells, respectively. The triterpenoids and diterpenoids constitute the major secondary metabolites of the S. marashica acetone and methanol extracts isolated by chromatographic methods. Their structures were determined based on spectroscopic methods, namely NMR and mass analyses. Ten terpenoids were obtained from either acetone or methanol extracts of the S. marashica. Seven of them were triterpenoids, elucidated as lupeol, lupeol-3-acetate, lup-12, 20(29)-diene, lup-20(29)-ene, alpha-amyrin-tetracosanoate, oleanolic acid and ursolic acid besides a steroid beta-sitosterol. Two abietane diterpenes, abieta-8,11,13-triene (1) and 18-acetoxymethylene-abieta-8,11,13-triene (2), were obtained from the acetone extract which were isolated from a Salvia species for the first time in the present study. The methanol extract was found to be very rich in rosmarinic acid determined by LC-MS/MS analysis.
  • PublicationMetadata only
    Synthesis and Comprehensive in Vivo Activity Profiling of Olean-12-en-28-ol, 3β-Pentacosanoate in Experimental Autoimmune Encephalomyelitis: A Natural Remyelinating and Anti-Inflammatory Agent
    (2023-01-01) Şenol H.; Özgün Acar Ö.; Dağ A.; Eken A.; Güner H.; Aykut Z. G.; Topçu G.; Şen A.; ŞENOL, HALIL; DAĞ, AYDAN; TOPÇU, GÜLAÇTI
  • PublicationMetadata only
    Computer Aided Design and Synthesis of New Ursane Triterpenoids with Nuclear Factor Kappa B Inhibition Effect
    (2019-12-19) Şenol, Halil; Akdemir, Atilla; Topçu, Gülaçtı; ŞENOL, HALIL; AKDEMİR, ATİLLA; TOPÇU, GÜLAÇTI
  • PublicationMetadata only
    Simultaneous Determination of Phenol and p-Cresol in Human Urine by an HPLC Method
    (2016-06-01) Tekkeli, S. E. Kepekci; Kiziltas, M. V.; Dincel, DEMET; ERKOC, R.; Topcu, GÜLAÇTI; TEKKELİ, ŞERİFE EVRİM; DİNCEL, DEMET; TOPÇU, GÜLAÇTI
    Introduction: In patients with chronic kidney disease (CKD), uremic toxins accumulate in blood and cannot be excreted with urine. Accumulation of these toxins has negative effects on many body functions. Because of the importance of these toxins, we developed and validated a simple, sensitive, accurate, and precise method for the determination of two main uremic toxins:phenol and p-cresol in human urine. Materials and methods:Separation of these analytes in urine samples was achieved by reverse-phase high-performance liquid chromatography (RP-HPLC) with a C18 column at 35 degrees C using the mobile phase of methanol-water (65:35) at a flow rate of 1.4 mL min(-1). Fluorimetric detection was used at 284 nm for excitation and 310 nm for emission. Results:The method is linear over the range of 1.5-35 ng mL(-1) and 1-45 ng mL(-1) for phenol and p-cresol, respectively. The method was applied to urine samples from 10 healthy subjects and 10 chronic kidney disease patients. Conclusions:This assay appears to be useful in routine analysis of clinical samples for simultaneous determination of phenol and p-cresol levels in urine.
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  • PublicationMetadata only
    Synthesis of Oleanolic Acid Analogues and Their Cytotoxic Effects on 3T3 Cell Line
    Background: Oleanolic acid (OA) is a known natural compound with many important biological activities. Thirteen oleanolic acid derivatives linked at C-3 and C-28 were synthesized and their structures were confirmed by H-1- and C-13 NMR and mass spectral analyses. Among them, compounds 4, 6, 8-10, 12, 13 were synthesized for the first time. They were evaluated for their cytotoxic activity. They showed proliferative effect at low concentrations while cytotoxic effect was observed at high concentrations in a dose dependent manner.
  • PublicationMetadata only
    Composition of the essential oil of Satureja metastasiantha: a new species for the flora of Turkey
    (2020-01-01T00:00:00Z) Carikci, Sema; GÖREN, AHMET CEYHAN; Dirmenci, Tuncay; Yalcinkaya, Burhanettin; Erkucuk, Aysen; TOPÇU, GÜLAÇTI; GÖREN, AHMET CEYHAN; TOPÇU, GÜLAÇTI
    The aerial parts of Satureja metastasiantha were hydrodistilled for 3 h using a Clevenger-type apparatus. The essential oils were analyzed by gas chromatography/flame ionization detector and gas chromatography/mass spectrometry, simultaneously, the main compounds of which were characterized as p-cymene (22.3%), thymol (21.0%), carvacrol (18.45%), and gamma-terpinene (12.1%). Antioxidant capacity, acetylcholinesterase and butyryl-cholinesterase inhibition effects, and antimicrobial and antifungal properties of the species were evaluated. The anticholinesterase activity of the essential oil of S. metastasiantha was observed with 30% inhibition at 200 mu g/mL. The essential oil of the species showed activity against Staphylococcus aureus with 128 mu g/mL minimum inhibitory concentration value.