Browsing by Author "Donmez, Fatih"

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Ameliorative Effects of Scutellaria Pinnatifida Subsp. Pichleri (Stapf) Rech.f. Extract in Streptozotocin-Induced Diabetic Rats: Chemical Composition, Biochemical and Histopathological Evaluation
(Bmc, 2023) Bakac, Mehmet Salih; Dogan, Abdulahad; Yilmaz, Mustafa Abdullah; Altindag, Fikret; Donmez, Fatih; Battal, Abdulhamit
BackgroundsScutellaria Pinnatifida subsp. pichleri (Stapf) Rech.f. (SP) is used in folk medicine for the treatment of diabetes. The aim of the study was to determine the phenolic profile of SP extract (SPE) by LC-MS/MS and to investigate the antidiabetic, hepatoprotective and nephroprotective effects of SPE in streptozotosin (STZ)-induced diabetic rat model.MethodsForty-two rats were randomly divided into six groups (n = 7): Control (nondiabetic), diabetes mellitus (DM), DM + SP-100 (diabetic rats treated with SPE, 100 mg/kg/day), DM + SP-200 (diabetic rats treated with SPE, 200 mg/kg/day), DM + SP-400 (diabetic rats treated with SPE, 400 mg/kg/day) and DM + Gly-3 (diabetic rats treated with glibenclamide, 3 mg/kg/day). Live body weight, fasting blood glucose (FBG) level, antidiabetic, serum biochemical and lipid profile parameters, antioxidant defense system, malondyaldehyde (MDA) and histopathological examinations in liver, kidney and pancreas were evaluated.ResultsApigenin, luteolin, quinic acid, cosmosiin and epigallocatechin were determined to be the major phenolic compounds in the SPE. Administration of the highest dose of SP extract (400 mg/kg) resulted in a significant reduction in FBG levels and glycosylated hemoglobin levels in STZ-induced diabetic rats, indicating an antihyperglycemic effect. SPE (200 and 400 mg/kg) and glibenclamide significantly improved MDA in liver and kidney tissues. In addition, SPE contributed to the struggle against STZ-induced oxidative stress by stimulating antioxidant defense systems. STZ induction negatively affected liver, kidney and pancreas tissues according to histopathological findings. Treatment with 400 mg/kg and glibenclamide attenuated these negative effects.ConclusionsIn conclusion, the extract of the aerial part of Scutellaria pinnatifida subsp. pichleri has hepatoprotective, nephroprotective and insulin secretion stimulating effects against STZ-induced diabetes and its complications due to its antidiabetic and antioxidant phytochemicals such as apigenin, luteolin, quinic acid, cosmosiin and epigallocatechin.
Developing of an Eco-Friendly Liquid-Liquid Microextraction Method by Using Menthol-Based Hydrophobic Deep Eutectic Solvent for Determination of Basic Fuchsin Dye: Assessment of the Greenness Profile
(Springer, 2024) Aydin, Funda; Alkan, Volkan; Donmez, Fatih
Herein, we aimed to develop a new environmentally friendly liquid-liquid microextraction (LLME) method based on hydrophobic deep eutectic solvent (hDES) synthesized using biodegradable dl-menthol and decanoic acid for the spectrophotometric determination of toxic basic fuchsin dye in environmental water samples. The parameters affecting the extraction efficiency such as pH, mole ratio, and volume of hDES (1:2) and type and volume of organic solvent, sample volume, times of vortex, ultrasonic bath and centrifuge, ionic strength, and matrix effect were investigated and optimized. Under optimal conditions, the calibration curve showed linearity in the range of 7.4-167 mu g L-1 with a coefficient of determination of 0.9994. The limit of detection, intra-day and inter-day precision, and recovery values were 2.25 mu g L-1, 2.46% and 4.45%, and 105 +/- 3%, respectively. The preconcentration and enrichment factors were found to be 30 and 61.5, respectively. The proposed hDES-LLME methodology was successfully applied to the environmental water samples to detect toxic BF dye (95-105%). Finally, the ecological impact of the suggested method was evaluated using the analytical eco-scale (PPS:88), complementary green analytical procedure indexe (ComplexGAPI), and the Analytical GREEnness tool (0.63). The assessment results showed that the presented analytical method can be regarded as a green LLME approach for the determination of the BF in water.
Electroanalytical Determination of Enrofloxacin Based on the Enhancement Effect of the Anionic Surfactant at Anodically Pretreated Boron-Doped Diamond Electrode
(Elsevier Science Sa, 2018) Donmez, Fatih; Yardim, Yavuz; Senturk, Zuhre
In this paper, a mercury-free and modification-free electroanalytical methodology based on anodically pretreated boron-doped diamond electrode is described for the quantification of enrofloxacin. The oxidation of compound was irreversible and presented an adsorption controlled process. The sensitivity of the stripping voltammetric measurements was significantly improved when the anionic surfactant, sodium dodecylsulfate (SDS) was present in the electrolyte solution. Using square-wave stripping mode, a linear response was obtained for enrofloxacin determination in 0.1 mol L-1 HNO3 solution containing 9 x 10(-4) mol L-1 SDS at +1.27 V (vs. Ag/AgCl) (after 60 s accumulation at open-circuit condition). Linearity was found within 0.025 to 1.0 mu g mL(-1) (6.96 x 10(-8)-2.78 x 10(-6) mol L-1) with a detection limit 0.0057 mu g mL(-1) (1.59 x 10(-8) mol L-1). The proposed method could be used for the determination of enrofloxacin in pharmaceutical formulations and the spiked human urine samples with acceptable recoveries.
Evaluation of the Erythrocyte Fragility, Haematological Parameters and Antioxidant Properties of Platanus Orientalis Leaf Infusion Against Ethanol Toxicity in Rats
(Adem Yavuz Sonmez, 2020) Dogan, Abdulahad; Donmez, Fatih; Anuk, Ozgur Ozan
The aim of this study was to evaluate the protective effects of the leaf infusion of chinar (Platanus orientalis L.) on erythrocyte fragility, haematological parameters and antioxidant status against ethanol-induced oxidative stress in rats. Thirty male rats were divided into five groups: Control, Ethanol, Ethanol+Silymarin (10 mg kg(-1)), Ethanol+PO-20 mg mL(-1) infusion, and Ethanol+PO-60 mg mL(-1) infusion. According to the results, in the Ethanol group, erythrocyte counts, red cells distribution, plateletcrit, platelet and lymphocyte levels significantly decreased compared to the Control group, while PO-60 dose-fed group showed a significant increase in haematocrit and haemoglobin values compared to the Ethanol group. There were significant changes in erythrocyte fragility of Ethanol and Ethanol-treatment groups at different NaCl concentrations of 0.3 and 0.6 according to Control group. It was observed that PO Leaf infusion reduced the hemolysis caused by ethanol at a concentration of 0.3% NaCl, thus reducing the values to the control values. In addition, PO leaf infusion caused a significant increase in total antioxidant status against ethanol toxicity and a significant decrease in total oxidative status and oxidative stress index. It was concluded that PO leaf infusion may have antihematotoxic effect, reducing erythrocyte fragility and increase antioxidant capacity against ethanol toxicity.
Exploring Phytochemical Constituents of Achillea Arabica Kotschy. Ethanolic Flower Extract by Lc-ms/Ms and Its Possible Antioxidant and Antidiabetic Effects in Diabetic Rats
(Walter de Gruyter Gmbh, 2023) Hanalp, Hanife Ceren; Dogan, Abdulahad; Saygi, Tuba Kusman; Donmez, Fatih; Battal, Abdulhamit
The aim of this study was to reveal the antidiabetic and antioxidant effects of ethanolic lyophilized extract of Achillea arabica flower extract against streptozotosine (STZ)-induced in diabetic rats and to determine its phytochemical content by liquid chromatography with tandem mass spectrometry (LC-MS/MS). After toxicity test, 35 female rats were divided into five groups. Control, diabetes mellitus (DM), A.arabica (400 mg/kg) extract, DM + A. arabica (400 mg/kg) extract and DM + Glibenclamide (2 mg/kg). It was determined that while diabetic rats treated A.arabica plant extract significantly decreased blood glucose level, serum glucose, HbA1c, liver and kidney damage biomarker levels, and malondialdehyde (MDA) content compared to the DM group, it caused fluctuations in antioxidant enzyme levels. According to LC-MS/MS results of A. arabica flower extract, quinic acid (2439.9 mu g/g), cyranoside (858.4 mu g/g), chlorogenic acid (698.7 mu g/g), and cosmosiin (347.8 mu g/g) were determined as major compounds, respectively. In addition, two new compounds were determined in this extract according to nuclear magnetic resonance (NMR) and Mass analyses and these compounds were named edremitine and achillosine, respectively. Thus, A.arabica flower extract has possible therapeutic effects to prevent high blood glucose level and oxidative stress caused by DM in liver and kidney via its high phenolic content.
Exploring the Ameliorative Effects of Hypericum Scabrum L. on a Surgically-Induced Endometriosis Rat Model and Its Phytochemical Lc-ms/Ms- Profile
(Soc Stiinte Farmaceutice Romania, 2023) Ilhan, Mert; Battal, Abdulhamit; Kaptaner, Burak; Dogan, Abdulahad; Donmez, Fatih; Yilmaz, Mustafa abdullah; Eroglu, Huseyin
Endometriosis is described as the existence and expansion of functional endometrial-like tissues in another part of the uterine cavity. It affects not only postmenopausal women but also teenagers after menarche, causing subfertility, dysmenorrhea and severe pelvic pain. Since no specific treatment is acknowledged for this disease, the present study aimed to investigate the efficacy of H. scabrum in a surgically-induced endometriosis rat model. In order to test the efficacy of H. scabrum on endometriosis, n-hexane, ethyl acetate (EtOAc), methanol (MeOH) and aqueous extracts were prepared from the aerial parts of H. scabrum. The cytokine levels, antioxidant enzyme activities, the contents of malondialdehyde (MDA) and glutathione (GSH) and histopathological analyses were evaluated. In order to reveal the potential active compounds, liquid chromatography-mass/mass spectroscopy (LC-MS/MS) analysis was performed on the MeOH extract who presentedthe highest activity. The MeOH extract significantly decreased the adhesion scores, endometriotic implant volumes, cytokine levels and the antioxidant parameters. Furthermore, histological procedures supported those findings. According to LC-MS/MS analysis of the MeOH extract, the major compounds were mostly phenolic acids and flavonoids. We concluded that the MeOH extract from H. scabrum aerial parts could be used for the treatment of endometriosis, and its activity could be attributed to the chlorogenic acid and quercetin, detected in the highest amounts.
Histochemical Changes, Cellular Dynamics and Antioxidant Responses in the Corpuscles of Stannius of the Female Lake Van Fish (Alburnus Tarichi Guldenstadt, 1814) (Cyprinidae) During Migration From Highly Alkaline and Brackish Water To Freshwater
(Wiley, 2022) Kaptaner, Burak; Dogan, Abdulahad; Aykut, Handan; Yildiz, Fatos; Donmez, Fatih; Dogan, Emine
The Lake Van fish (Alburnus tarichi) is an anadromous species, which is endemic to Lake Van Basin of Turkey. In spring, the fish migrates from Lake Van, which has highly alkaline and brackish water, to freshwater to spawn. During the anadromous migration of the female Lake Van fish, histochemical changes in the cell types, cellular dynamics, apoptosis, cell proliferation and antioxidant responses in the corpuscles of Stannius (CS) which are tiny endocrine glands related with calcium homeostasis were examined. When compared to the lake, calcium concentrations of ambient water and plasma increased considerably in freshwater. Freshwater dramatically increased the number of predominant type-I cells in the gland while decreased the type-II cells. A reduction in the cytoplasmic periodic acid-Schiff content of type-I cells was observed in freshwater. No cytoplasmic staining was found in cytoplasm of type-II cells in both lake and freshwater. Apoptotic cells were detected in fish sampled from both the lake and freshwater and a nonsignificant increase was observed in freshwater. The number of proliferating cells increased significantly in the freshwater, as well as antioxidant defences such as catalase, glutathione peroxidase and glutathione s-transferase activities, which indicates an elevated oxidative status. The findings suggest that type-I cells are possible source of a hypocalcin hormone and type-II cells are considered to be a likely precursor of type-I cells. Apoptosis and cell proliferation are basic mechanisms of gland remodelling. In addition antioxidant mechanisms play a role during the acclimation of the gland in different environments.
Investigation of Neurotoxic and Immunotoxic Effects of the Chinar (Platanus Orientalis L.) Tree Leaf Infusion Against Ethanol Toxicity in Rats
(2020) Donmez, Fatih; Battal, Abdulhamit; Dogan, Abdulahad; Rae, Iain Jonathan; Anuk, Özgür Ozan
In this study, immunotoxic and neurotoxic effects of leaf infusion of Platanus orientalis L. (PO) were investigated in rats ethanol-induced toxicity. Neurotoxic effects of ethanol were evaluated by measuring acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) in rat brain tissue. Immunotoxic effects were evaluated by adenosine deaminase (ADA) and myeloperoxidase (MPO) biomarkers in rat liver, lung, erythrocyte and spleen tissues. Thirty male Wistar rats were divided into five groups after toxicity study. The groups are explained as follow: Control, Ethanol 20 %, Ethanol 20 % + Silymarin (10 mg kg-1), Ethanol 20 % + PO-20 mg mL-1 infusion and Ethanol 20 % + PO-60 mg mL-1 infusion. The results showed that AChE and BChE activities statistically decreased in the groups treated with PO leaf infusion. While there was a statistically significant decrease in ADA and MPO activities in liver tissue of groups treated with PO leaf infusion. Also, MPO activity of erythrocyte in ethanol group was significantlly increased according to silymarin and PO-60 groups. On the other hand, there was no statistically significant finding was found in lung and spleen tissues. It was concluded that the infusion prepared from P. orientalis leaves suppressed to ethanol-induced neurotoxicity and immunotoxicity.
Simple, Rapid, and Sensitive Electrochemical Determination of Antithyroid Drug Methimazole Using a Boron-Doped Diamond Electrode
(Springer, 2019) Seyidahmet, Safanur; Donmez, Fatih; Yardim, Yavuz; Senturk, Zuehre
This paper aims a rapid, cheap, simple and modification-free electroanalytical methodology using a boron-doped diamond electrode pretreated anodically for the determination of antithyroid drug methimazole in pharmaceutical samples. The drug was irreversibly oxidized which was a diffusion-controlled process. Using square wave voltammetry, a linear response was obtained for methimazole determination in Britton-Robinson buffer (pH 5.0) at +0.89V (vs. Ag/AgCl). Linearity was found between the oxidation peak currents and the concentration of methimazole from 0.5 to 25.0 mu g mL(-1) (4.38x10(-6)-2.19x10(-4)M) with a detection limit of 0.085 mu g mL(-1) (7.45x10(-7) M). The proposed method was applied for the determination of methimazole in commercial tablet samples.