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Öğe Synthesis, characterization and antioxidant activity of heterocyclic Schiff bases(Journal of the Chinese Chemical Society, 2020-08-04) Aral, Tarık; Dağ, Beşir; Kızılkaya, Hakan; Genç, Nusret; Erenler, RamazanSchiff base derivatives have gained great importance due to revealing a great number of biological properties. Schiff bases were synthesized by treatment of 4-amino-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one (1) with various aldehydes in methanol at reflux. In addition, diamine was reacted with an aldehyde to yield the corresponding Schiff bases. The structures of synthesized Schiff bases were elucidated by spectroscopic methods such as microanalysis, 1 H-NMR, 13C-NMR, and FTIR. Antioxidant activities of synthesized Schiff bases were carried out using different antioxidant assays such as 1,1-diphenyl-2-picryl-hydrazyl free radical (DPPH• ) scavenging, 2,20 -azino-bis (3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) radical scavenging, and reducing power activity. (E)-4-((1H-indol-3-yl)methyleneamino)-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one (3), (E)-1,5-dimethyl-4-((2-methyl-1H-indol-3-yl) methyleneamino)-2-phenyl-1H-pyrazol-3(2H)-one (5), (E)-1,5-dimethyl-2-phenyl-4-(thiophen-2-ylmethyleneamino)-1H-pyrazol-3(2H)-one (7), (E)-1,5-dimethyl2-phenyl-4-(quinolin-2-ylmethyleneamino)-1H-pyrazol-3(2H)-one (9), (1S,2S, N1,N2)-N1,N2-bis((1H-indol-3-yl)methylene)cyclohexane-1,2-diamine (11), and (1S,2S,N1,N2)-N1,N2-bis((2-methyl-1H-indol-3-yl)methylene)cyclohexane-1,2-diamine (12) were synthesized in high yields. Compound 5 displayed a good ABTS•+ activity. Compound 3 revealed the outstanding activity in all assays. Compound 7 has the best-reducing power ability in comparison to other synthesized compounds. Although compounds 5, 11, 12 are new, compounds 3, 7, 9 are known. Due to revealing a good antioxidant activity, the synthesized compounds (3, 5, 7) have the potential to be used as synthetic antioxidant agents.Öğe Synthesis and anticorrosion studies of 4-[(2-nitroacetophenonylidene)-amino]-antipyrine on SAE 1012 carbon steel in 15 wt.% HCl solution(Taylor & Francis, 2020-11-16) Gerengi, Hüsnü; Çakmak, Reşit; Dağ, Beşir; Solomon, M. M; Tüysüz Akbal, Hatice Aslıhan; Kaya, ErtuğrulA novel corrosion inhibitor, ((E)-1,5-dimethyl-4-((1-(3-nitrophenyl)ethylidene)amino)-2-phenyl-1,2-dihydro-3H-pyrazol-3-one) (DNPP) was synthesized in high yield by the condensation reaction of 4-aminoantipyrine with 2-nitroacetphenone derived from acetophenone as a starting material and characterized by FT-IR, 1H, and 13C NMR techniques. DNPP was tested against the corrosion of SAE 1012 carbon steel in 15 wt.% HCl solution using electrochemical and surface characterization techniques. Results obtained show that DNPP is effective in retarding the corrosion of SAE 1012 carbon steel. With 4 mM of DNPP, the charge transfer resistance of SAE 1012 in 15 wt.% HCl solution is raised from 17.42 to 140.50 Ω cm2 and the substrate surface is protected by 87%. The inhibition is through adsorption mechanism (mixed-adsorption type) and has been confirmed by SEM and EDAX results. Potentiodynamic polarization results reveal that DNPP acted as a mixed-type corrosion inhibitor. DNPP is a promising candidate for the formulation of an inhibitor cocktail for the strong acid environment.Öğe Mineral and heavy metal by inductively coupled plasma optical emission spectrometer in traditional Turkish yogurts(Academic Journals, 2013-05-23) Tarakçı, Zekai; Dağ, BeşirYogurt, a traditional Turkish dairy product is common in all region of Turkey. The different heavy metals were determined in commercial yogurts by inductively coupled plasma optical emission spectrometer (ICP–OES). Concentrations of calcium (Ca), phosphorus (P), sodium (Na), magnesium (Mg), aluminum (Al), zinc (Zn), iron (Fe), copper (Cu), manganese (Mn), boron (B), molybdenum (Mo), cadmium (Cd), cobalt (Co), chromium (Cr), nickel (Ni) and lead (Pb) were measured by ICP–OES; Varian Vista-Pro, Mulgrave, Victoria, Australia. Traditional Ordu yogurts generally have means of 1126.0 mg/kg Ca, 983.1 mg/kg P, 585.3 mg/kg Na, 112.4 mg/kg Mg, 1.73 mg/kg Fe, 0.71 mg/kg Cu, 4.51 mg/kg Zn, 0.0027 mg/kg Co, 0.017 mg/kg Cr, 18.11 mg/kg Al, 0.69 mg/kg B, 0.86 mg/kg Mn, 0.41 mg/kg Mo, 0.05 mg/kg Ni, 0.055 mg/kg Pb and 0.002 mg/kg Cd.Öğe Determination of flouride ions in resource and mineral waters of the Van region by using ion-selective electrode method(Scientific & Academic Publishing, 2014) Dağ, Beşir; Kılıçel, FevziFactors that have a significant negative effect of ecological research on species alive, especially human beings are very important. A most important danger for environment is called pollution that threaten human beings and nature since it is seen at the start of the second half of the twentieth century, due to technological development and a great increasing the population. As a result, toxic wastes accumulate continuously in the rivers, lakes and seas, cross-contamination of water leads to an important extent. Some of the water and soil with toxic and carcinogenic elements, concentrations exceed certain forms of pollution. Toxic and carcinogenic elements in waters and soils in any region, whether or not pollution, with research is exposed. With different ways some elements (Pb, Ni, Cd, As and Bi) reach to organisms, the body exhibit a direct toxic effect. Even though some of the elements (Cu, Mn, Zn, Co and Se, etc.) are the nutrients, increasing concentrations of these substances show a toxic effect [1]. The amount of fluoride in water is 1.0 mg/L as useful, as it is expressed on the concentrations of toxic and carcinogenic [2]. Because of the importance mentioned above, the source and the mineral waters of the Van region, the water samples were collected from 30 centers in 4 seasons. After some preparatory phase for the measurement of fluoride ion, the water samples were prepared. Examples were analyzed with ion-selective electrode method [3]. The values were compared with the standard values. The values in the samples vary according to the collection centers. Generally, the values are in the range of standard values. Fluoride in 2 samples taken from the centers of 9 and 17 has been found to exceed the standard.Öğe Some physicochemical properties and mineral contents of stirred yoghurts containing different fruit marmalades(Wiley-Blackwell, 2018-02-01) Temiz, Hasan; Tarakçı, Zekai; Yarılgaç, Tarık; Dağ, BeşirIn this study chemical properties and mineral levels of yoghurts containing different fruit marmalades were investigated. Cherry laurel, loquat fruit and kiwi marmalade were used to make the stirred yoghurts, and the calcium, phosphorus, sodium, magnesium, manganese, iron, zinc, copper, boron, lead, nickel, molybdenum, chromium, cadmium, cobalt levels were determined by an inductively coupled plasma optical emission spectrometer (ICP–OES). The total solid, fat, ash, pH, viscosity and syneresis contents of the yoghurt samples changed between 13.85–21.02%, 2.45–2.90%, 0.82–0.94%, 4.11–4.22, 2104–2454 cP and 42.0–47.0 mL/100 g, respectively. The mean concentrations in the yoghurts of these minerals were 104.66–118.94 calcium, 95.81–112.42 phosphorus and 13.47–15.04 magnesium as mg/100 g, 235.00–254.00 iron, 429.00–453.00 zinc and 70.45–122.90 copper as μg/100 g. The recommended dietary allowance (RDA) was calculated on the basis of the intake of one yoghurt portion (125 g).
