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    ANTIOXIDANT ACTIVITY OF AQUEOUS AND ETHANOL EXTRACTS OF CRATAEGUS MEYERI POJARK LEAVES AND CONTENTS OF VITAMIN, TRACE ELEMENT
    (Soc Chilena Quimica, 2017) Ekin, Suat; Bayramoglu, Mahire; Goktasoglu, Ahmet; Ozgokce, Fevzi; Kiziltas, Hatice
    The purpose of this study was to determine the antioxidant and antiradical activities in aqueous and ethanol extracts of Crataegus meyeri Pojark leaf, additionally, to examine some vitamins (A, E, C), trace elements (Cu, Zn, Mn, Se, Cr. Co). In this study, vitamin C, antioxidant and antiradical properties were determined using spectrophotometer. The results are compared with the reference antioxidants such as trolox, alpha-tocopherol and BHT. Levels of vitamin (A, E) measured using HPLC method. Trace elements were carried out using method of dry ashing with ICP-MS. The results of this study showed that C. meyeri leaf has a high antioxidant capacity and vitamin levels. C. meyeri is thought to be used as additives for food products and pharmaceutical industries with appropriate antioxidant properties and an antioxidant in future studies of experimental animal models, against free radicals generated in response to oxidative stress.
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    Antioxidant properties of Ferulago angulata and its hepatoprotective effect against N-nitrosodimethylamine-induced oxidative stress in rats
    (Taylor & Francis Ltd, 2017) Kiziltas, Hatice; Ekin, Suat; Bayramoglu, Mahire; Akbas, Esvet; Oto, Gokhan; Yildirim, Serkan; Ozgokce, Fevzi
    Context: Ferulago angulata (Schlecht.) Boiss. (Apiaceae) (FASB) is used to treat liver diseases and has been used both as food and therapeutics by many cultures for thousands of years because of the natural antioxidant compounds. Objective: This study determines antioxidant properties of FASB flowers, the levels of minerals and vitamins, and also, evaluates the hepatoprotective effect of flowers against N-nitrosodimethylamine (NDMA) induced on liver tissue by assessing antioxidant enzymes and histopathological parameters in Wistar albino rats. Materials and methods: In the study, the rats were divided into six groups of ten. Control, untreated animals were given 0.9% NaCl. Rats were intraperitoneally given NDMA (10 mg/kg) for the first 7 days. FASB methanol extract (150 and 300 mg/kg) was administered orally for 21 days. Results: a-Tocopherol, retinol, ascorbic acid, total antioxidant activity, phenolic and flavonoid contents of FASB were 0.70 +/- 0.13, 0.29 +/- 0.03 mu g/g, 139.32 +/- 7.06 mu g/100 g, 171.61 +/- 6.05 mM ascorbic acid/g, 90.47 +/- 4.11 mg GA/g and 37.39 +/- 2.85 mg QE/g. DPPH and hydroxyl radical scavenging activity was obtained IC 50 67.34 +/- 4.14 and 64.87 +/- 4.68 mu g/mL, respectively. Discussion and conclusion: The results of the study indicated that FASB flowers contain high levels of vitamins, minerals, total antioxidant activity, phenolics and flavonoids. Due to the positive effect on significant changes in antioxidant enzymes of liver tissue and histopathological examination, it is thought that the plant could be used as a hepatoprotective.
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    Antioxidant properties of Rosa pisiformis and its protective effect against isoproterenol-induced oxidative stress in rats
    (Walter De Gruyter Gmbh, 2016) Bayramoglu, Mahire; Ekin, Suat; Kiziltas, Hatice; Oto, Gokhan; Susen, Ebru Altindal; Ozgokce, Fevzi
    Objective: In this study, Rosa pisiformis was evaluated for its antioxidant activity, vitamin (A, E, C), trace element (Fe, Cu, Zn, Mn, Cr, Se) and mineral (Ca, K, Mg, Na) levels, in addition to its cardioprotective effects on cardiac tissue antioxidant enzymes (GSH-Px, SOD, CAT) during isoproterenol (ISO)-induced oxidative stress. Methods: In the study, vitamin and mineral analysis was carried out using HPLC and ICP-MS method, R. P. antioxidant and antiradical properties were determined using spectrophotometer. Forty wistar albino rats were divided into four groups: control (0.9% NaCl), ISO (100 mg/kg), ISO (100 mg/kg) + R. P. (300 mg/kg) and R. P. (300 mg/kg). ISO was injected subcutaneously into rats twice at an interval of 24 h for two consecutive days (on 28(th) and 29(th) day). R. P. fruit administered daily. The experimental period was continued for 30 days. Results: The results of the study indicated that R. P. fruit and leaves contain high levels of minerals and vitamins and possess antioxidant and antiradical activity and its fruits have positive effects on cardiac tissues. The results are supported with significant changes in antioxidant enzyme levels and histopathological examination. Conclusion: This study demonstrates that R. P. fruits in particular can be used to treat and prevent cardiac diseases.
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    Phenolic Contents, Enzyme Inhibitory Activities, and Protective Effect of Aqueous Extract of Rosa Pisiformis Fruits
    (Springer, 2024) Ekin, Suat; Akkoyun, Mahire Bayramoglu; Kiziltas, Hatice; Gok, Hasya Nazli; Oto, Gokhan; Akkoyun, Turan; Ozgokce, Fevzi
    The present study was designed to assess the phytochemical contents as well as the in vitro biological activities fruit of Rosa pisiformis and possible in vivo cardioprotective and hepatoprotective properties of the aqueous extract of R. pisiformis fruit on trace elements (cadmium, selenium, nickel, zinc, iron, copper, cobalt, chromium, manganese, lead), minerals (sodium, calcium, potassium, magnesium), glutathione and malondialdehyde in heart and liver tissue samples, serum vitamin (retinol, cholecalciferol, phylloquinone, alpha-tocopherol), total sialic acid, and lipid-bound sialic acid in a rat model of isoproterenol-induced oxidative damage. In the study, 40 Wistar albino rats were divided into four groups of ten each: control, isoproterenol 100 mg/kg bodyweight; isoproterenol 100 mg/kg bodyweight; then R. pisiformis 300 mg/kg bodyweight, and R. pisiformis 300 mg/kg bodyweight. Rats were given isoproterenol twice at an interval of 24 h for two days (on days 28 and 29) subcutaneously. The experimental period was maintained at 30 days. According to analysis results, caffeic acid and p-coumaric acid were found to be the high contents of the fruit extracts at 6.01 +/- 0.0006 and 3.93 +/- 0.007 mg/100 g dry weight. It showed that R. pisiformis (300 mg/kg bodyweight) aqueous extract had a potent action on oxidative damage. The R. pisiformis (300 mg/kg bodyweight) treatment significantly alleviated toward normalcy on the zinc, manganese, cobalt, magnesium, and sodium values in the heart, and zinc and magnesium values in liver tissue samples. These positive effects may be related to the action of p-coumaric acid and caffeic acid present in the R. pisiformis 300 mg/kg and it has hypolipidemic and antioxidant properties that could protect from myocardial damage.