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Publication year : 2011 ✕Faculty / Institute : Mühendislik Fakültes ... ✕
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2-Benzo[c]cinnoline and 2-Benzo[c]cinnoline 6-oxide modified glassy carbon electrodes: electrocatalytic reduction of dioxygen in aqueous media

Ali Osman SOLAK

Benzo[c]cinnoline (BCC) molecules were electrochemically grafted onto a glassy carbon (GC) surface in nonaqueous media, and the modified surface was characterized using cyclic voltammetry (CV) with redox probes. Blockage of the electron transfer on the modified surface was observed using redox probes. Electrocatalytic effect of 2BCC modified GC (2BCC-GC) electrode surface towards to the electrochemical reduction of dioxygen was also investigated. A mechanistic scheme for the electrochemical catalysis was proposed. To clarify the mechanism of the dioxygen reduction, a less basic film of 2-benzo ...More

Article 2011 Mühendislik Fakültesi Instrumentation Science & Technology39 ( 2 ) 68 Views
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Spectroscopic and Electrochemical Characterization of Benzoylglycine-Modified Glassy Carbon Electrode: Electrocatalytic Effect Towards Dioxygen Reduction in Aqueous Media

Ali Osman SOLAK

Present work aims to create a benzoylglycine (BG)-modified glassy carbon (GC) substrate exploiting the electroreduction of diazonium salts. Dopamine was used to confirm the attachment of benzoylglycine molecules onto the glassy carbon surface by observing the blockage of the electron transfer using cyclic voltammetry (CV). BG-modified GC surface (BG-GC) was also characterized by Raman spectroscopy and electrochemical impedance spectroscopy (EIS) techniques. The ellipsometric thickness of the BG film was measured as approximately 14 nm for seven CV cycles. The electrocatalytic effect of BG-GC e ...More

Article 2011 Mühendislik Fakültesi Spectroscopy Letters: An International Journal for Rapid Communication 44 ( 3 ) 53 Views
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Synthesis, electrochemical and structural characterization of novel azacrown ether containing macrocyclic redox-active vic-dioxime ligand and its mononuclear transition metal complexes: Application of DEPT, HSQC, HMBC-NMR and cyclic voltammetry

Ali Osman SOLAK

This paper presents a new azacrown containing vic-dioxime; anti-N-(4-aminophenyl)aza-15-crown-5-glyoxime (LH2), and its mononuclear nickel(II), copper(II), cobalt(II), cadmium(II) and zinc(II) complexes. The azacrown moieties appended at the periphery of the oxime provide solubility for the vic-dioxime ligand and complexes in common organic solvents. The mononuclear M(LH)2 (M = Ni and Cu), M(LH)2(H2O)2 (M = Co) and [M(LH)(H2O)(Cl)] (M = Cd and Zn) complexes have been obtained with the metal:ligand ratios of 1:2 and 1:1. The structure of the ligand is confirmed by elemental analysis, Fourier tr ...More

Article 2011 Mühendislik Fakültesi Polyhedron3 ( 10 ) 42 Views
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1,10-Phenanthroline modified glassy carbon electrode for voltammetric determination of cadmium(II) ions

Ali Osman SOLAK

This study reports the electrochemical modification of glassy carbon (GC) electrode surface with the electro-polymerized form of 1,10-phenanthroline monohydrate (PMH), the characterization of this polyphenanthroline modified electrode (PPMH/GC) and the electroanalytical application suitable for the determination of Cd(II) ions. The PPMH/GC electrode was characterized by cyclic voltammetry, chronoamperometry and atomic force microscopy and formation of polyphenanthroline layer grafted to surface of GC electrode was evidenced. Selectivity of PPMH/GC electrode towards heavy metal ions was investi ...More

Article 2011 Mühendislik Fakültesi Sensors and Actuators B: Chemical157 ( 1 ) 67 Views
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Direct electron transfer from glucose oxidase immobilized on polyphenanthroline-modified glassy carbon electrode

Ali Osman SOLAK

This study reports direct electron transfer (DET) from immobilized glucose oxidase (GOx) via grafted and electropolymerized 1,10-phenanthroline monohydrate (PMH). The layer of poly-1,10-phenanthroline (PPMH) was gained via electrochemical deposition, which was used to create the PPMH-modified GC-electrode (PPMH/GC-electrode). Further, the GOx was immobilized on the PPMH/GC-electrode. The effect of surface-modification by the PPMH on the electron-transfer between enzyme and electrode-surface and some other electrochemical/analytical-parameters of newly designed enzymatic-electrode were evaluate ...More

Article 2011 Mühendislik Fakültesi Biosensors and Bioelectronics26 ( 5 ) 132 Views
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Application of the linear principle for the strongly-correlated variables: Calculations of differences between spectra

Ali Osman SOLAK

In this paper the authors suggest a new method of detection of possible differences between similar near infrared (NIR) spectra based on the self-similar (fractal) property. This property is a general characteristic that belongs to a wide class of the strongly-correlated systems. As an example we take a set of NIR spectra measured for three systems: (1) glassy carbon (GC) electrodes, (2) GC electrodes affected by azobenzene (AB) substance and finally (3) films (AB-FILM). Besides the physical model that should describe the intrinsic properties of these substances we found the fitting function t ...More

Article 2011 Mühendislik Fakültesi Communications in Nonlinear Science and Numerical Simulation16 ( 10 ) 54 Views
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A survey of concentration of aflatoxin M1 in dairy products marketed in Turkey

Zafer GÖNÜLALAN

The aim of this study was to examine the presence of aflatoxin M1 (AFM1) in dairy product samples by enzyme-linked immunosorbent assay (ELISA). Aflatoxin M1 were found in 135 (64%) out of 210 analyzed samples. Only 7% of dairy product samples were contaminated at levels above the legal limits. AFM1 was detected in 43 (86%) of milk samples (ranging from 1 to 30 ng/l), in 38 (63%) of cheese (ranging from 12 to 378 ng/kg), in 28 (56%) of yoghurt (ranging from 2.5 to 78 ng/kg) and in 26 (52%) of dairy dessert samples (ranging from 1.5 to 80 ng/kg). None of the raw milk samples contained levels abo ...More

Article 2011 Mühendislik Fakültesi Food Control22 ( 12 ) 20 Views
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Covalent grafting of three flavonoids onto the glassy carbon electrode surface by cyclic voltammetry

Ali Osman SOLAK

Electrochemical oxidation of quercetin (QR), 3-hydroxy­flavone (3HF), and baicalein (BN) and their grafting onto the glassy carbon (GC) electrode have been studied using the cyclic voltammetric (CV) technique. Electrochemical studies were performed within a one-compartment three-electrode cell at room temperature. The modification was carried out only in nonaqueous media, while the electrochemical characterization was done in both aqueous and nonaqueous media. In the nonaqueous experiments, 0.1 m tetrabutylammonium tetrafluoroborate in acetonitrile was used, whereas in the aqueous experiments, ...More

Article 2011 Mühendislik Fakültesi Reviews in Analytical Chemistry30 ( 3-4 ) 80 Views
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A novel apigenin modified glassy carbon sensor electrode for the determination of copper ions in soil samples

Ali Osman SOLAK

In this study, electrochemical modification of a glassy carbon (GC) electrode with apigenin was carried out and the modified electrode was used for determination of copper(II) (Cu(II)) in soil samples. The GC was modified through the electrochemical polymerization of apigenin (PolyApi/GC) on the electrode surface in aqueous media. The electrode surface was modified with apigenin in phosphate buffer solution (PBS), pH 7, from 0 mV to +1400 mV potential ranges, using 100 mV s−1 sweep rate and 30 cycles by cyclic voltammetry (CV). The surface characterizations of this sensor electrode were perfor ...More

Article 2011 Mühendislik Fakültesi Analytical Methods3 ( 11 ) 128 Views
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A novel surface plasmon resonance enhanced total internal reflection ellipsometric application: electrochemically grafted isophthalic acid nanofilm on gold surface

Ali Osman SOLAK

The scope of this study is to modify a Surface Plasmon Resonance (SPR) sensor slide with isophthalic acid to evaluate the possible application on the detection of copper(II) ions in aqueous media by total internal reflection ellipsometry. A gold sensor surface was modified by an electrochemical diazonium reduction modification method. The modified surfaces are characterized with cyclic voltammetry (CV) and ellipsometry. Isophthalic acid monolayer modified gold slides were used for in situdetection of aqueous Cu2+ solution with the SPR enhanced total internal reflection ellipsometry (SPRe-TIRE) ...More

Article 2011 Mühendislik Fakültesi Analytical Methods136 ( 7 ) 75 Views
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Analysis of the Nano-Surface of a Modified Glassy Carbon Electrode by Pseudo Phase Plane Method

Ali Osman SOLAK

This paper presents the Pseudo phase plane (PPP) method for detecting the existence of a nanofilm on the nitroazobenzene-modified glassy carbon electrode (NAB-GC) system. This modified electrode systems and nitroazobenze-nanofilm were prepared by the electrochemical reduction of diazonium salt of NAB at the glassy carbon electrodes (GCE) in nonaqueous media. The IR spectra of the bare glassy carbon electrodes (GCE), the NAB-GC electrode system and the organic NAB film were recorded. The IR data of the bare GC, NAB-GC and NAB film were categorized into five series consisting of FILM1, GC-NAB1, ...More

Article 2011 Mühendislik Fakültesi Journal of Computational and Theoretical Nanoscience8 ( 10 ) 79 Views
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Front face fluorescence spectroscopy as a tool for comparison of aromatic amino acids, nucleic acids, vitamin A and FMRP containing in different egg types

Mustafa Haluk ÇELİK

Fluorescence spectroscopy was used to determine contents of amino acids, nucleic acids, Maillard reaction products and vitamin A in whites and yolks of eggs from hens, geese, ducks and quail. The fluorescence spectra obtained varied between egg types and allowed the eggs to be grouped and differentiated from each other on the basis of their composition. Keywords: amino acids; duck eggs; ducks; eggs; fluorometry; geese; maillard reaction; maillard reaction products; nucleic acids; quail eggs; quails; retinoids; spectrofluorometry; spectroscopy; vitamin a; goose eggs

Article 2011 Mühendislik Fakültesi Annals Food Science and Technology12 ( 2 ) 104 Views
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