Search results for: Mahfuz Elmastaş

Items from 1 to 20 out of 25 results

article

Half-sandwich Ruthenium(II) arene complexes bearing the azo-azomethine ligands: Electrochemical, computational, antiproliferative and antioxidant properties

Ayşe İnan, Ali Burak Sünbül, Mesut İkiz, Seçil Erden Tayhan, more

Journal of Organometallic Chemistry > 2018 > 870 > C > 76-89

Three novel azo-azomethine ligands have been synthesized in an accomplished one-pot synthesis protocol. The mononuclear Ru(II) complexes of these azo-azomethine dyes were prepared and characterized by the combination of elemental analyses, IR, UV–Visible spectroscopy and ¹H¹³C NMR spectra. Solid state structures of 3, 4 and 7 were determined by single crystal X-ray diffraction studies. The electrochemical...

article

Ecological variation of yield and aroma components of summer savory (Satureja hortensis L.)

Duran Katar, Oya Kacar, Nimet Kara, Zehra Aytaç, more

Journal of Applied Research on Medicinal and Aromatic Plants > 2017 > 7 > C > 131-135

The research was conducted to determine a variation of yield and essential oil compositions of cultivated summer savory (Satureja hortensis L., Lamiaceae) in 5 different locations (Isparta, Kütahya, Eskişehir, Bursa, and Tokat) in Turkey in 2004. Field studies were carried out during 2014 vegetation periods in all locations. Essential oil compositions were analyzed with gas chromatography coupled...

article

Effects of leaf removals on must and wine chemical composition and phenolic compounds of Narince (Vitis vinifera) grape cultivar

Tuba Bekar, Mustafa Bayram, Rüstem Cangi, Nusret Genc, more

Scientia Horticulturae > 2017 > 225 > C > 343-349

Leaves are the vital components of grapevines. Leaves are removed with summer pruning to improve grape and wine quality. Leaves of some grape cultivars are harvested at different periods for stuffed grape leaves or brined vine leaves. Since the leaves of Narince grape cultivar supplies an income as much as the grapes, the cultivars are commonly exposed to excessive leaf harvests. The present study...

article

Changes in flavonoid and phenolic acid contents in some Rosa species during ripening

Mahfuz Elmastaş, Ayşe Demir, Nusret Genç, Ümit Dölek, more

Food Chemistry > 2017 > 235 > C > 154-159

In this study, fruits of Rosa dumalis, R. canina, and R. villosa were cultivated and harvested at six different time points based on colour changes during the ripening period. Phenolic acid and flavonoid contents in fresh hypanthium were determined by HPLC-DAD. Derivatives of organic acid (gallic, caffeic, p-coumaric, and ferulic acids) and flavonoid (catechin, eriocitrin, rutin, apigenin, quercetin,...

article

Studies on the Antioxidant and Antiproliferative Potentials of Cirsium arvense subsp. vestitum

Ibrahim Demirtas, Ali Riza Tufekci, Ayse Sahin Yaglioglu, Mahfuz Elmastas

Journal of Food Biochemistry > 41 > 1 > n/a - n/a

The antioxidant (DPPH, superoxide anion radical scavenging and FRAP) and antiproliferative activities against Vero cells (african green monkey kidney), C6 cells (rat brain tumor cells) and HeLa cells (human uterus carcinoma) of Cirsium arvense (CA) of all parts [root (Kinghorn et al. 2004), stem (CAS), flower (CAF) and leaves] and isolated compounds were investigated in vitro. CAR was shown to have...

article

Responses of the phenolic compounds of Zea mays under heavy metal stress

Dursun Kısa, Mahfuz Elmastaş, Lokman Öztürk, Ömer Kayır

Applied Biological Chemistry > 2016 > 59 > 6 > 813-820

Heavy metal toxicity is one of the major abiotic stresses caused by physiological and biochemical changes. Plants have evolved various phytochemical defense mechanisms to cope with this abiotic stress conditions. Phenolic compounds are one of the stress responses and have multiple roles in respect to adaptation of plants to the environment. In the present study, we aimed to evaluate the differential...

article

New bio-active azo-azomethine based Cu(II) complexes

Munire Sarigul, Aysel Sari, Muhammet Kose, Vickie McKee, more

Inorganica Chimica Acta > 2016 > 444 > C > 166-175

In this study, new azo-azomethine ligands L¹H–L³H and their Cu(II) complexes were synthesized and characterized by the analytical and spectroscopic methods such as elemental analyses, infrared, mass, ¹H and ¹³C NMR spectra. Molecular structures of the azo-azomethine ligands were determined by single crystal X-ray diffraction studies. X-ray data revealed that the compound L¹H adopts azo-enamine tautomer...

article

Isolation and identification of chemical constituents from Origanum majorana and investigation of antiproliferative and antioxidant activities

Ramazan Erenler, Ozkan Sen, Huseyin Aksit, Ibrahim Demirtas, more

Journal of the Science of Food and Agriculture > 96 > 3 > 822 - 836

BACKGROUNDOriganum majorana L., belonging to the Lamiaceae family, has great potential and has been used as a folk medicine against asthma, indigestion, headache and rheumatism; in addition, the essential oils of this plant have been used widely in the food industry. Plant materials have been harvested from the Medicinal and Aromatic Plant Field of Gaziosmanpasa University. Air‐dried plant materials...

article

Chemical Constituents, Quantitative Analysis and Antioxidant Activities of Echinacea purpurea (L.) Moench and Echinacea pallida (Nutt.) Nutt.

Ramazan Erenler, Isa Telci, Musa Ulutas, Ibrahim Demirtas, more

Journal of Food Biochemistry > 39 > 5 > 622 - 630

Echinacea is valuable for its pharmaceutical, medicinal and agricultural properties. Flowers and leaves of Echinacea purpurea (L.) Moench and Echinacea pallida (Nutt.) Nutt. were extracted with methanol, filtered, and solvents were removed by rotary evaporator to get four separate extracts. The flowers and leaves of both plants were boiled in water then extracted with ethyl acetate to achieve another...

article

Rapid synthesis of novel 1,8-dioxoacridine carboxylic acid derivatives by microwave irradiation and their free radical scavenging activity

Ramazan Ulus, İbrahim Yeşildağ, Mahfuz Elmastaş, Muharrem Kaya

Medicinal Chemistry Research > 2015 > 24 > 10 > 3752-3759

Synthesis of novel acridine carboxylic acid compounds 4–18 was performed with the reaction of 4-aminobenzoic acid 1, aromatic aldehyde 2a–n, 1,3-diketone 3a, 3b using microwave irradiation. These compounds were synthesized efficiently in one-pot procedure for 6 min without catalyst in high yields of 65–90 % using little ethanol. Radical scavenging activities of synthesized compounds 4–18 were determined...

article

Studies on the antioxidant potential of flavones of Allium vineale isolated from its water-soluble fraction

Ibrahim Demirtas, Ramazan Erenler, Mahfuz Elmastas, Ahmet Goktasoglu

Food Chemistry > 2013 > 136 > 1 > 34-40

The aim of this work was to examine the chemical constituents and antioxidant potential of water-soluble fractions from the commonly consumed vegetable, Allium vineale. The water-soluble fraction, containing phenolic compounds, was extracted with ethyl acetate to obtain flavonoids which were separated and purified by repeated column chromatography over Sephadex LH-20, RP C18 and silica gel. The isolated...

article

Antioxidant capacity and total phenolic compounds of Spirogyra ellipsospora transeau

Koksal Pabuccu, Tuba Demiriz, Mahfuz Elmastas, Emel Turgut

Journal of Biotechnology > 2012 > 161 > Supplement > 13-14

article

Antioxidant capacity and total phenolic compounds of Spirogyra varians (Hassall) Kützing

Koksal Pabucu, Derya Bayer, Mahfuz Elmastas, Zekeriya Altuner

Journal of Biotechnology > 2012 > 161 > Supplement > 28

article

Antioxidant capacity and total phenolic compounds of Vaucheria geminata (Vaucher) DC

Veysel Vuran, Koksal Pabuccu, Tuba Demiriz, Mahfuz Elmastas

Journal of Biotechnology > 2012 > 161 > Supplement > 28

article

Antioxidant activity of clove oil – A powerful antioxidant source

İlhami Gülçin, Mahfuz Elmastaş, Hassan Y. Aboul-Enein

Arabian Journal of Chemistry > 2012 > 5 > 4 > 489-499

⁺ scavenging, superoxide anion radical scavenging, hydrogen peroxide scavenging, ferric ions (Fe³⁺) reducing power and ferrous ions (Fe²⁺) chelating activities. Also, these various antioxidant activities were compared to BHA, BHT, α-tocopherol and trolox as reference antioxidant compounds.

article

Antioxidant, electrochemical, thermal, antimicrobial and alkane oxidation properties of tridentate Schiff base ligands and their metal complexes

Gökhan Ceyhan, Cumali Çelik, Serhan Uruş, İbrahim Demirtaş, more

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2011 > 81 > 1 > 184-198

In this study, two Schiff base ligands (HL ¹ and HL ² ) and their Cu(II), Co(II), Ni(II), Pd(II) and Ru(III) metal complexes were synthesized and characterized by the analytical and spectroscopic methods. Alkane oxidation activities of the metal complexes were studied on cyclohexane as substrate. The ligands and their metal complexes were evaluated for their antimicrobial activity...

article

Isoeugenol-based novel potent antioxidants: Synthesis and reactivity

Esra Fındık, Mustafa Ceylan, Mahfuz Elmastaş

European Journal of Medicinal Chemistry > 2011 > 46 > 9 > 4618-4624

We are attempting to develop the novel phenolic synthetic antioxidants aimed at retarding the effects of free radicals and oxidants. The phenolic compounds (7–12) were synthesized by Friedel-Crafts alkylation of isoeugenol (1) and phenol derivatives (2–6) and their structures were determined by spectroscopic methods. All the synthesized phenolic compounds (7–12) except 12 are new. Antioxidant and...

article

Radical scavenging and antioxidant activity of tannic acid

İlhami Gülçin, Zübeyr Huyut, Mahfuz Elmastaş, Hassan Y. Aboul-Enein

Arabian Journal of Chemistry > 2010 > 3 > 1 > 43-53

Tannic acid, a naturally occurring plant polyphenol, is composed of a central glucose molecule derivatized at its hydroxyl groups with one or more galloyl residues. In the present paper, we examines the in vitro radical scavenging and antioxidant capacity of tannic acid by using different in vitro analytical methodologies such as 1,1-diphenyl-2-picryl-hydrazyl free radical (DPPH) scavenging, 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic...

article

Chemical composition and antioxidant activity of Ocimum minimum essential oils

Isa Telci, Mahfuz Elmastas, Ayse Sahin

Chemistry of Natural Compounds > 2009 > 45 > 4 > 568-571

Published in Khimiya Prirodnykh Soedinenii, No. 4, pp. 480–482, July–August, 2009.

article

Determination of antioxidant activity and antioxidant compounds in wild edible mushrooms

Mahfuz Elmastas, Omer Isildak, Ibrahim Turkekul, Nuri Temur

Journal of Food Composition and Analysis > 2007 > 20 > 3-4 > 337-345

The methanolic extracts of dried Agaricus bisporus, Polyporus squamosus, Pleurotus ostreatus, Lepista nuda, Russula delica, Boletus badius, and Verpa conica were analyzed for antioxidant activity in different systems including reducing power, free radical scavenging, superoxide anion radical scavenging, total antioxidant activity, and metal chelating activities. Those various antioxidant activities...

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Food Chemistry (6)
Journal of Biotechnology (3)
Arabian Journal of Chemistry (2)
Journal of Food Biochemistry (2)
Applied Biological Chemistry (1)
Chemistry of Natural Compounds (1)
European Journal of Medicinal Chemistry (1)
Inorganica Chimica Acta (1)
Journal of Applied Research on Medicinal and Aromatic Plants (1)
Journal of Food Composition and Analysis (1)
Journal of Organometallic Chemistry (1)
Journal of the Science of Food and Agriculture (1)
Medicinal Chemistry Research (1)
Pharmacological Research (1)
Scientia Horticulturae (1)
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy (1)
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INFONA - science communication portal

Search results for: Mahfuz Elmastaş

Half-sandwich Ruthenium(II) arene complexes bearing the azo-azomethine ligands: Electrochemical, computational, antiproliferative and antioxidant properties

Ecological variation of yield and aroma components of summer savory (Satureja hortensis L.)

Effects of leaf removals on must and wine chemical composition and phenolic compounds of Narince (Vitis vinifera) grape cultivar

Changes in flavonoid and phenolic acid contents in some Rosa species during ripening

Studies on the Antioxidant and Antiproliferative Potentials of Cirsium arvense subsp. vestitum

Responses of the phenolic compounds of Zea mays under heavy metal stress

New bio-active azo-azomethine based Cu(II) complexes

Isolation and identification of chemical constituents from Origanum majorana and investigation of antiproliferative and antioxidant activities

Chemical Constituents, Quantitative Analysis and Antioxidant Activities of Echinacea purpurea (L.) Moench and Echinacea pallida (Nutt.) Nutt.

Rapid synthesis of novel 1,8-dioxoacridine carboxylic acid derivatives by microwave irradiation and their free radical scavenging activity

Studies on the antioxidant potential of flavones of Allium vineale isolated from its water-soluble fraction

Antioxidant capacity and total phenolic compounds of Spirogyra ellipsospora transeau

Antioxidant capacity and total phenolic compounds of Spirogyra varians (Hassall) Kützing

Antioxidant capacity and total phenolic compounds of Vaucheria geminata (Vaucher) DC

Antioxidant activity of clove oil – A powerful antioxidant source

Antioxidant, electrochemical, thermal, antimicrobial and alkane oxidation properties of tridentate Schiff base ligands and their metal complexes

Isoeugenol-based novel potent antioxidants: Synthesis and reactivity

Radical scavenging and antioxidant activity of tannic acid

Chemical composition and antioxidant activity of Ocimum minimum essential oils

Determination of antioxidant activity and antioxidant compounds in wild edible mushrooms

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