Yazar "Tegin, Ibrahim" seçeneğine göre listele

Listeleniyor 1 - 10 / 10
  • [ X ]
    Öğe
    Chemical profiling and antioxidant potential of propolis from Pervari, Siirt: discovery of tannic acid and key bioactive compounds
    (Taylor & Francis Ltd, 2025) Sirma, Erkan; Fidan, Mehmet; Gok, Mesut; Tegin, Ibrahim; Yilmaz, Mustafa Abdullah; Yabalak, Erdal
    Propolis, a natural product with remarkable therapeutic potential, has gained attention for its antimicrobial, antioxidant, and anti-inflammatory properties. In this study, propolis samples from Sar & imath;yaprak, Kovana & gbreve;z & imath;, and & Ccedil;emikari in Pervari, Siirt province, were analysed comprehensively. The evaluation included wax composition, DPPH and FRAP assays, total phenolic and flavonoid content, and pollen analysis. Phytochemical compounds were identified using GC-MS and LC-MS/MS techniques. Among the regions, & Ccedil;emikari samples exhibited the highest antioxidant activity and phenolic and flavonoid contents, with wax content averaging 60% across all locations. Key compounds identified via RSH-GC/MS included alpha-pinene, beta-pinene, nonadecanal, and nonanal, while GC-MS revealed borneol, sedrenol, and benzyl alcohol. Significant phenolic compounds such as gallic acid, caffeic acid, and tannic acid (reported for the first time in Turkish propolis) were also detected. The high borneol concentration, with its strong anti-inflammatory properties, underscores the unique traits of these samples and their promising antioxidant potential for further research.
  • [ X ]
    Öğe
    Phosphorus and oxygen co-doped carbon particles based on almond shells with hydrothermal and microwave irradiation process for adsorption of lead (II) and cadmium (II)
    (Springer Heidelberg, 2023) Kahvecioglu, Kubra; Tegin, Ibrahim; Yavuz, Omer; Saka, Cafer
    In this study, the production of activated carbon based on almond shells by microwave heating with KOH activation and then the modification of activated carbon with phosphorus and oxygen as a result of hydrothermal heating with phosphoric acid were carried out to increase the Cd(II) and Pb(II) adsorption efficiency. The resulting materials were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric/differential thermal analyzer (TG-DTA), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and nitrogen adsorption. Adsorption performance, kinetics and thermodynamics of phosphorus, and oxygen-doped activated carbons were evaluated. The results showed that the adsorption of both Cd(II) and Pb(II) on phosphorus and oxygen-doped activated carbons obeyed the Langmuir isotherm and pseudo-second-order kinetics. The adsorption capacity values (Q(m)) obtained from the Langmuir isotherm for Cd(II) and Pb(II) adsorption were 185.18 mg/g and 54.64 mg/g, respectively. At the same time, the adsorption mechanism of Pb(II) and Cd(II) on the respective adsorbents was evaluated. As a result of phosphorus and oxygen atoms, Lewis base sites on carbon atoms and Lewis acid sites on phosphorus atoms are likely to form on the surface. These Lewis base sites can act as important active sites in adsorption reactions, especially of positively charged Pb(II) and Cd(II) ions.
  • [ X ]
    Öğe
    Reduction of Cr(VI) in aqueous solutions by natural and roasted pyrite
    (Asian Journal Of Chemistry, 2007) Dolak, Ibrahim; Tegin, Ibrahim; Guzel, Remziye; Ziyadanogullari, Recep
    In present study, the effects of parameters such as acid concentration of the medium, amount of pyrite, initial Cr(VI) concentration, contact time, temperature and particle size of pyrite on the reduction of Cr(VI) by discontinuous experiments using raw pyrite and the pyrite samples roasted at high temperatures in vacuum were examined. Considering that the pyrite sample converted FeS structure which has much higher reduction ability and is more homogeneous by roasting at high temperatures in vacuum, it was determined that using the pyrite sample in this way for the Cr(VI) reduction was much more efficient.
  • [ X ]
    Öğe
    Removal and Preconcentration of Pb(II), Cr(III), Cr(VI) from the Aqueous Solution and Speciation of Cr(III)-Cr(VI) by Using Functionalized Amberlite XAD-16 Resin with Dithioethylenediamine
    (Asian Journal Of Chemistry, 2010) Dolak, Ibrahim; Tegin, Ibrahim; Guzel, Remziye; Ziyadanogullari, Recep
    Amberlit XAD-16 was functionalized using dithioethylenediamine as a ligand and characterized by elemental analysis and FTIR spectroscopy. The effects of contact time, pH, electrolyte and the concentration of eluent on separation and preconcentration of Pb(II), Cr(III) and Cr(VI) were studied. In addition, the batch capacity for each ion was determined under the optimum conditions. The preconcentration yields of Pb(II), Cr(III) and Cr(VI) were found to be 96.60 +/- 3.02, 102.20 +/- 3.00 and 100.64 +/- 2.24 %, respectively, with 500 times preconcentration factor under the optimum conditions. The speciation of Cr(III)-Cr(VI) was studied, it was determined that Cr(III) separated in 93.24 +/- 2.21 % yield from the solution containing Cr(III)-Cr(VI) by using Amberlit XAD-16-dithioethylenediamine and Cr(VI) remained in the solution at pH 4, while Cr(VI) separated in 101.43 +/- 3.09 % yield from the solution containing Cr(III)-Cr(VI) and Cr(III) remained in the solution. at pH 7.50 by using Amberlit XAD-16-dithioethylenediamine-Pb(II).
  • [ X ]
    Öğe
    Removal and Preconcentration of Pb(II), V(V), Cr(VI) from the Aqueous Solution and Selective Separation of V(V)-Cr(VI) by Using Functionalized Amberlite XAD-16 Resin with Dithioethylenediamine
    (Asian Journal Of Chemistry, 2010) Dolak, Ibrahim; Tegin, Ibrahim; Guzel, Remziye; Ziyadanogullari, Recep
    Amberlit XAD-16 was functionalized using dithioethylenediamine as a ligand. and characterized by elemental analysis and FTIR spectroscopy. The effects of contact time, pH, electrolyte and the concentration of eluents on separation and preconcentration of Pb(II), Cr(VI) and V(V) were studied. In addition, the batch capacity for each ion was determined under the optimum conditions. The preconcentration yields of Pb(II), Cr(VI) and V(V) were found to be 96.60 +/- 3.02, 100.64 +/- 2.24 and 98.20 +/- 3.00 %, respectively, with 500 times preconcentration factor under the optimum conditions. The selective separation of Cr(VI)-V(V) was studied in terms of pH. It was determined that V(V) separated in 98.24 +/- 1.21 % yield from the solution containing Cr(VI)-V(V) and Cr(VI) remained in the solution at pH 2.5, while Cr(VI) separated in 101.43 +/- 3.09 % yield from the solution containing Cr(VI)-V(V) and V(V) remained in the solution at pH 8.5 by using Amberlit XAD-16-dithioethylenediamine -Pb(II).
  • [ X ]
    Öğe
    The role of trace elements in wagner classified diabetic patients
    (Academic Journals, 2011) Bozkurt, Fatma; Gulsun, Serda; Ustun, Cemal; Geyik, M. Faruk; Tegin, Ibrahim; Satici, Omer
    Wagner's classification is the most widely used grading system in diabetic foot infections. The aim of this study was to evaluate the role of the trace elements in diabetic foot infected patients graded with Wagner's classification. This prospective study was carried out on 50 diabetic patients with variable severity of foot infections and 50 age and sex matched healthy subjects in Dicle University, Turkey, between October 2006 and November 2008. Diabetic foot infections were graded according to Wagner classification and deep tissue cultures were performed from all diabetic foot infected patients. The atomic absorption spectrophotometer was used in the measurement of trace elements in the serum. serum zinc and copper levels were significantly elevated in patients with Wagner 3 and 4 compared to Wagner 2 and 1 graded patients and healthy controls. Also Wagner 1 and 2 graded patients had higher serum zinc levels compared to healthy controls (p < 0.001). This study confirms that trace elements may be used as a leading sign to determine the severity of infections in diabetic foot wounds and may be used to predict outcome of diabetic foot infections.
  • [ X ]
    Öğe
    Separation of Mo, Cu, Zn and Pb from concentrates of fluorite ore containing molybdenum
    (Asian Journal Of Chemistry, 2007) Ziyadanogullari, Recep; Akguen, Abuzer; Tegin, Ibrahim; Guezel, Remziye
    This study deals with the separation of Mo, Cu, Zn and Ph from concentrates of a flotation process of Elazig region fluorite ore containing of molybdenum. The original ore contained (%) 1.08 Mo, 0.05 Cu, 1.12 Zn, 1.20 Ph and 12 F. The ore concentrate after flotation contained (%) 19.46 Mo, 0.87 Cu, 4.54 Zn and 2.65 Pb. The fluorite itself was separated and left in the residue during flotation process. A hydrometallurgical concentration process was used for the separation of Mo, Cu, Zn and Ph. In view of the existence of sulfide, the concentrate was roasted at 600 degrees C and the concentrations of dissolved ions were investigated. The result was not fruitful. In the following work, the concentrates were roasted at various temperatures and durations and the samples were later treated in a autoclave at 225 degrees C wi,th 15 M H2SO4. Under suitable set of conditions Mo, Cu and Zn were dissolved and Pb was left behind in the form of PbSO4. The molybdenum in the solution was separated from copper and zinc by an extraction process by using alamine 336 (trioctylamine). (NH4)(2)S was used to separate molybdenum from the organic phase. Due to the presence of the other ions such as vanadium, tantalum and niobium, the separation of molybdenum could not be achieved with H2S, but (NH4)(2)S was utilized in the process.
  • [ X ]
    Öğe
    Synthesis and Preconcentration of Amberlite XAD-4 Resin Modified by Dithioethylenediamine
    (Asian Journal Of Chemistry, 2009) Dolak, Ibrahim; Tegin, Ibrahim; Guezel, Remziyfe; Ziyadanogullari, Recep
    In the present work, Amberlite XAD-4 copolymer resin modified by rubeanic acid was synthesized for separation and preconcentration of Cu(II), Co(II), Ni(II)), Cd (II) and Mn(II). The optimization procedure for analytical parameters including pH, contact time, batch capacity, etc. was examined in order to obtain quantitative recoveries of metal ions. Preconcentration yields of Cu(II), Co(II), Ni(II), Cd (II) and Mn(II) by Amberlite XAD-4-dithioethylenediamine copolymer resin were found as 103.3 +/- 2.6, 96.8 +/- 1.7, 102.0 +/- 3.0, 90.3 +/- 1.7 and 97.2 +/- 2.4 %, respectively. Batch capacity of Cu(II), Co(II), Ni(II), Cd(II) and Mn(II) by Amberlite XAD-4-dithioethylenediamine copolymer resin was determined as 0.1243 +/- 0.0036, 0.2057 +/- 0.0034, 0.2323 +/- 0.0043, 0.1757 +/- 0.0025 and 0.1888 +/- 0.0034 mmol g(-1) resin, respectively. The preconcentration factor was 500 for Cu (II), Co (II), Ni(II), Cd(II) and Mn(II).
  • [ X ]
    Öğe
    Synthesis and Spectral Studies of Macrocyclic Pb(II), Zn(II), Cd(II) and La(III) Complexes by Template Reaction of 1,2-Bis(2-formylphenyl)ethane with Metal Nitrate and Various Diamine
    (Maik Nauka/Interperiodica/Springer, 2010) Ilhan, Salih; Temel, Hamdi; Pasa, Salih; Tegin, Ibrahim
    Eight new macrocyclic complexes were synthesized by template reaction of 1,4-bis(3-aminopropoxy)butane or (+/-)-trans-1,2-diaminocyclohexane with metal nitrate and 1,2-bis(2-formylphenyl)ethane and their structures were proposed on the basis of elemental analysis, FT-IR, UV-Vis, molar conductivity measurements, H-1 NMR and mass spectra. The metals to ligand molar ratios of the complexes were found to be 1 : 1. The complexes are 1 : 2 electrolytes for Cd(II), Pb(II) and Zn(II) complexes and 1 : 3 electrolytes for La(III) as shown by their molar conductivities (Lambda(m)) in DMSO at 10(-3) mol L-1. Due to the existence of free ions in these complexes, such complexes are electrically conductive. The configurations of Cd(II) and Zn(II) complexes were proposed to probably tetrahedral, La(III) complexes are octahedral and Pb(II) complexes are octahedral geometry in the L-1 complex and tetrahedral geometry in the L-2 complex.
  • [ X ]
    Öğe
    Synthesis, structural characterization of new macrocyclic Schiff base derived from 1,6-bis(2-formylphenyl)hexane and 2,6-diaminopyridine and its metal complexes
    (Natl Inst Science Communication-Niscair, 2008) Ilhan, Salih; Ternel, Hamdi; Sunkur, Murat; Tegin, Ibrahim
    A macrocyclic ligand has been synthesized by reaction of 2,6-diaminopyridine and 1,6-bis(2-formylphenyl).hexane. Its complexes with Cu(II), Ni(II), Pb(II), Zn(II), Cd(II) and La(III) have been synthesized by the reaction of ligand and Cu(ClO4)(2)center dot 6H(2)O, Ni(ClO4)(2)center dot 6H(2)O, Pb(ClO4)(2)center dot 6H(2)O, Zn(ClO4)(2)center dot 6H(2)O, Cd(ClO4)(2)center dot 6H(2)O and La(ClO4)(3)center dot 6H(2)O, respectively. The ligand and its metal complexes have been characterized. All complexes are diamagnetic while the Cu(II) complex is binuclear.