Nusret Ertaş

Nusret Ertaş
Gazi University · Faculty of Pharmacy

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86
Publications
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Publications

Publications (86)
Article
Background There is no human data regarding the exposure, metabolism and potential health effects of arsenic (As) contamination in drinking water in the Central Anatolian region, Turkey. Methods Residents in the 10 villages with drinking water total As (T-As) level >50 μg/L and 10–50 μg/L were selected as an exposed group (n = 420) and, <10 μg/L a...
Preprint
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Background: There is no human data regarding exposure, metabolism and potential health effects of arsenic (As) contamination in drinking water in the Central Anatolian region, Turkey. Methods: Residents in the 10 villages with drinking water total As (T-As) level >50 µg/L and 10-50 µg/L were selected as an exposed group (n=420) and, <10 µg/L as a c...
Article
Smartphone digital image colorimetry (SDIC), combined with solidification of floating organic drop-dispersive liquid-liquid microextraction (SFOD-DLLME), was proposed for the determination of iodate ions. A colorimetric box was designed to capture images of sample solutions. Factors affecting the efficiency of SDIC included type of phone, region of...
Article
Multiplex detection and quantification of bacteria in water by using portable devices are particularly essential in low and middle-income countries where access to clean drinking water is limited. Addressing this crucial problem, we report a highly sensitive immunoassay sensor system utilizing fluorescence technique with magnetic nanoparticles (MNP...
Article
Full-text available
Dispersive liquid–liquid microextraction followed by a back-extraction step was combined with HPLC-DADfor the determination of four parabens (i.e. methyl-, ethyl-, propyl-, and butylparaben). Optimum extraction conditionswere found as follows: 225 uL of chloroform, 0.75 mL of ethanol, 7.5 mL of aqueous solution and within an extractiontime of 15 s....
Article
In this report, a passive microfluidic chip design was developed for fast and sensitive fluorometric determination of Escherichia coli (E. coli) based on sandwich immunoassay. Initially, magnetic nanoparticles (MNPs) and chitosan modified mercaptopropionic acid capped cadmium telluride (CdTe) quantum dots (QDs) were functionalized with E.coli speci...
Article
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Acrylamide (ACR) is a potential carcinogen and is found in thermally processed foods such as potato chips, biscuits, baby foods, coffee, etc. In this paper, l-cysteine-capped Mn-doped ZnS quantum dots (QDs) as phosphorescent probes were used for the determination of ACR. This method based on quenching of the phosphorescence intensity of the QDs wit...
Article
Full-text available
The original version of this article unfortunately contained mistakes. The sentence “ACR was determined in all samples in the range of 24.3 to 453.2 g kg⁻¹.” should read “ACR was determined in all samples in the range of 24.3 to 453.2 μg kg⁻¹.” In Table 2 header, it should be “Sample value (μg kg⁻¹)”. © 2017 Springer Science+Business Media, LLC, pa...
Article
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Objectives: To describe a method for the determination of urea in blood serum using urease enzyme and 3-MPA-capped CdTe quantum dots. Materials and Methods: The method is based on the increase in pH of the solution as a result of the reaction between urea and urease, which causes an increase in the phosphorescence signal of MPA-CdTe quantum dots i...
Article
The aim of this study was to analyse the effect of heat treatment parameters on liquid whole egg (LWE) proteins by using ultraviolet–visible (UV–VIS) spectroscopy and capillary electrophoresis (CE). Heat treatment (at 60–68 °C for 1–5 min) was applied to LWE. Treated LWE was centrifuged and supernatant was taken for measurement of UV–VIS spectrosco...
Article
Polyurethane (PU) ureteral stents have been widely used as biomedical devices to aid the flow of the urine. Due to the biofilm formation and encrustation complications it has been hindered their long term clinical usage. To overcome these complications, in this study, cationic polyethyleneimine (PEI) brushes grafted on PU stents and their performan...
Article
Hydride generation atomic absorption spectrometry (HGAAS) with different types of atomizers (flame heated quartz T-tube and W-coil) was evaluated for comparison of interference effects of some hydride forming elements for arsenic determination. W-coil was used as an on-line atomizer or as a trapping surface. Mutual interferences of Sb(III), Se (IV)...
Article
In this study, a fast and sensitive sandwich assay has been developed with the combination of immunomagnetic separation (IMS) and fluorescence techniques to enumerate Escherichia coli (E.coli). Iron oxide core gold shell (Fe3O4@Au) magnetic nanoparticles were prepared and modified with biotinylated antibodies specific to E.coli. Fluorescence labels...
Article
Capillary electrophoretic (CE) and high performance liquid chromatographic (HPLC) methods were developed and optimized for the determination of antazoline (ANT) and tetrahydrozoline (TET) in ophthalmic formulations. Optimum electrophoretic conditions were achieved using a background electrolyte of 20 mM phosphate buffer at pH 7.0, a capillary tempe...
Article
A heavy atom-induced room-temperature phosphorescence (HAI-RTP) technique was used for the determination of etodolac and flurbiprofen in tablets. Phosphorescence signals from aqueous solutions of etodolac and flurbiprofen were monitored in the presence of potassium iodide and sodium sulphite. The maximum phosphorescence excitation and emission wave...
Article
Full-text available
Dispersive liquid–liquid microextraction method based on solidification of floating organic drop (DLLME-SFO) was combined for the first time with counter-electroosmotic flow normal stacking mode (counter-EOF NSM) in capillary electrophoresis (CE) for preconcentration and determination of bisphenol A (BPA) in water and urine samples. Several paramet...
Thesis
Capillary electrophoresis (CE) with direct on-capillary UV detection was applied along with four online sample preconcentration techniques for the simultaneous preconcentration and determination of arsenite [As(III)], arsenate [As(V)], monomethylarsonic acid (MMA), dimethylarsinic acid (DMA), antimonite [Sb(III)] and antimonate [Sb(V)]. These techn...
Article
Dispersive liquid-liquid microextraction based on solidification of floating organic drop (DLLME-SFO) was for the first time combined with field-amplified sample injection (FASI) in CE to determine four β(2) -agonists (cimbuterol, clenbuterol, mabuterol and mapenterol) in bovine urine. Optimum BGE consisted of 20 mM borate buffer containing 0.1 mM...
Article
Ultrasound-assisted emulsification microextraction and dispersive liquid-liquid microextraction were compared for extraction of ephedrine, norephedrine, and pseudoephedrine from human urine samples prior to their determination by capillary electrophoresis. Formation of a microemulsion of the organic extract with an aqueous solution (at pH 3.2) cont...
Article
Nanostructured polyaniline was prepared by simple interfacial polymerization using immiscible organic/aqueous biphasic systems in the presence of sulfonated β-cyclodextrin and sulfonated α-cyclodextrin. Sulfonated cyclodextrins (CDs) were used to promote the template synthesis resulting in different structure of PANI. The effect of synthesis condit...
Article
A novel method was developed for the in situ trapping of stannane on an iridium-coated tungsten coil. Coating the tungsten coil with iridium has significantly improved the sensitivity. The tungsten coil can either be used as an on-line atomizer or as a trapping surface. The interference effect of some hydride-forming elements such as, As(III), Se(I...
Article
Full-text available
Pollution of the aquatic environment is a global concern owing to the devastating effects of contaminants whose levels are growing at an alarming rate, and it has become a major threat for marine organisms, as well as to humans as consumers. This study has been carried out on leaping mullet obtained from Aliaga Bay, which is located on the west coa...
Article
Three-dimensional network of branched fibers of conducting polypyrrole was synthesized by interfacial polymerization method in the presence of sulfonated  -cyclodextrin (S CD) as the dopant. A high surface area of open-pore polypyrrole structure was obtained with the aid of S CD, and the incorporation of S CD units into the polypyrrole fibers w...
Article
A tungsten coil (150 W, 15 V) was used as the atomizer for the proposed Flow Injection Vapor Generation Atomic Absorption Spectrometry (FI-VGAAS) system to determine inorganic mercury and total mercury concentrations. In the proposed method inorganic mercury was measured when the W-coil is at room temperature and total mercury was measured when the...
Article
A continuous flow hydride generation manifold coupled to a tungsten coil atomizer for in situ trapping of antimony hydride was described. Iridium coated tungsten coil atomizer can be used for both on-line atomization and trapping while bare tungsten coil can be used only for on-line atomization mode. The interference effects of several hydride form...
Article
A stable film of poly(3-octylthiophene)–dihydroxyanthraquinone sulfonate has been synthesized electrochemically in non-aqueous solution. The incorporation of dihydroxyanthraquinone sulfonate as an anionic complexing ligand into poly(3-octylthiophene) film during electropolymerization was achieved and copper ions were accumulated by reduction on the...
Article
An atom trapping approach is described for the determination of lead by hydride generation flame atomic absorption spectrometry. Lead hydride (PbH4), generated on-line by reacting lead in hydrochloric acid–potassium ferricyanide medium with sodium borohydride (NaBH4), was trapped on the interior walls of a slotted T-tube under highly oxidizing flam...
Article
In this study, when Te (IV) and Te (VI) solutions were prepared by deionized water, unexpected differences in the flame AAS sensitivity for Te were found, depending on the oxidation state. Te (IV) gave a significantly greater absorbance than the same concentration of Te (VI) in the air-acetylene flame. However, when these solutions were prepared in...
Article
The well-known method for the determination of mercury(II), which is based on the anodic stripping voltammetry of mercury(II), has been adapted for applications at the thin film poly(3-hexylthiophene) polymer electrode. Halide ions have been found to increase the sensitivity of the mercury response and shift it more positive potentials. This behavi...
Article
Citalopram, a selective serotonin reuptake inhibitor, is used as an antidepressant agent. In this study an on-line solid phase extraction method with spectrofluorometric detection was developed. Solid phase extraction cartridges contain 200mg C18 with a particle size of 45μm. The best solvent system found was consistend of ethanol and 0.1M acetic a...
Article
Citalopram is a selective serotonin reuptake inhibitor that is used for the treatment of depression. A rapid, selective, sensitive, and simple fluorescence method has been developed for the direct determination of citalopram in pharmaceutical tablets. Standard citalopram and the tablets were dissolved in distilled water and excited at 240 nm, and f...
Article
Full-text available
The lead content of shed primary teeth has proved to be a reliable measure of cumulative lead exposure in children as it is an indicator of the degree of exposure over several years, from in utero life to loss of the tooth. Totally 297 shed deciduous teeth were collected from 263 children between ages 4 and 15 to determine the level of lead exposur...
Article
Clinical Relevance This study failed to find a correlation between blood mercury levels and cytogenic damage in dentists exposed to mercury vapor below 0.1mg/m3.
Article
We report the use of an inexpensive, small, and "turn-key" Q-switched 532-nm Nd:YAG laser as a source for nonlinear, direct-write protein microfabrication. In this approach, microJoule pulses (pulse widths, approximately 600 ps) are focused using high numerical aperture optics to submicrometer focal spots, creating instantaneous intensities great e...
Article
Full-text available
A flow-injection UV spectrophotometric method for the determination of ketoprofen in gels and ampules was developed. Quantitative determination of ketoprofen was realized by using distilled water as a carrier for gels and citrate buffer, pH 6.5, for ampules at 261 nm. No spectrophotometric interferences from additives of gels, carboxypolymethylene...
Article
Full-text available
Mercury (Hg) is a naturally occurring element and its toxicity, especially in certain forms, has been known for many years. Exposure to Hg can occur in occupational and environmental settings. The toxicity of Hg compounds in dentistry has been an issue of increasing concern. Dental personnel are occupationally exposed to Hg vapor in their working e...
Article
A method for the extraction and selective determination of cations is proposed using electro-synthesized overoxidized sulfonated polypyrrole film. The polymer film is used for the selective extraction of trace levels of nickel and cadmium ions by solid-phase microextraction (SPME). The cation uptake and release properties of the overoxidized sulfon...
Article
Full-text available
One of the main sources of occupational exposure to lead (Pb) in Turkey is in workers of battery industries. Genotoxic studies in human populations exposed to this metal have had conflicting results. Genotoxic effects of Pb were studied in blood cell samples from workers of battery manufactures exposed to Pb compounds by chromosomal aberration (CA)...
Article
Flow injection hydride generation atomic absorption spectrometry (FI-HGAAS) was used for determination of lead in dialysis concentrates. The parameters such as acidity, concentration of oxidising and reducing agents and argon gas flow rate were investigated to reach the best peak height sensitivity. No significant background signal was observed at...
Article
The use of a solid-phase microextraction (SPME) method with a new design of functionalized stable overoxidized sulfonated polypyrrole (OSPPy) film electrode to extract metal ions (Ni(II) and Cd(II)) without derivatization from water of high saline content is described. Different cation uptake behavior is obtained for OSPPy and overoxidized polypyrr...
Article
Full-text available
Interference effects of KCl, NH4H2PO4, (NH4)2CO3, MgCl2, NH4NO3, NaNO3, (NH4)2SO4, MgSO4·7H2O, CaCl2, Ca(NO3)2 and NaCl on Bi, Cd, In, Pb and Sb were investigated using the atom trapping technique with a double slotted silica tube. Analyte solutions at concentration levels of 60, 6, 300, 75, 100 ng mL−1 for Bi, Cd, In, Pb and Sb, respectively, were...
Article
Dental laboratory technicians may be exposed to metal alloys that are used in the production of crowns, bridges and removable partial dentures. These alloys consist of 35-65% cobalt, 20-30% chromium, 0-30% nickel, and small amounts of molybdenum, silica, beryllium, boron and carbon. The aim of this study was to assess whether dental technicians are...
Article
Full-text available
A novel analytical system was developed to trap and preconcentrate bismuth from the vapour phase stream. Bismuthine formed by sodium tetrahydroborate reduction was trapped on a tungsten coil previously heated to 270 °C. The analyte species were re-volatilised by increasing the coil temperature to 1200 °C and then transported to an externally heated...
Article
A novel silica trap for lead determination at concentration levels of ng/l was developed using hydride-generation atomic absorption spectrometry. The device consists of a 7.0-cm silica tubing which is externally heated to a desired temperature. The lead hydride vapor is generated by a conventional hydride-generation flow system. The trap is placed...
Article
A derivative ultraviolet (UV) spectrophotometric method for the determination of piroxicam in piroxicam--beta-cyclodextrin tablets was developed. Phosphate buffer (pH 7.8, 0.1 M) and ethanol were used as a solvent system throughout the study. In this study, determination of piroxicam was conducted by using first order derivative amplitudes at 261.4...
Article
Full-text available
Boron is one of the least sensitive elements in atomic emission spectrometry. As various refractory substances interfere in the analysis and because of the low sensitivity, sample enrichment and the separation of the interfering matrix is needed. Methyl borate has many advantages because of its simple generation conditions and its stability in the...
Article
A reservoir type of optode is described for simultaneous and remote determination of Cd and Zn using [9-(1',4',7',10',13'-pentaazacyclopentadecyl)methylanthracene] as the fluorophore. Simultaneous analysis was achieved by the significant perturbation in the fluorescence spectrum of the Cd-ligand complex while the Zn complex only results in enhancem...
Article
A method has been developed for the determination of 23 elements in marine plankton in which inductively coupled plasma (ICP) source mass spectrometry (MS) was used to quantify the elements in the solution after digestion in a mixture of hydrofluoric and nitric acids in sealed PTFE vessels in a microwave field. The procedure was validated by the an...
Article
The chemical state of analyte species collected on a water-cooled silica tube during atom-trapping atomic absorption spectrometric determination is investigated with the use of X-ray photoelectron spectroscopy (XPS) for Bi and Mn. Analysis of the Bi 4f 7/2 peak reveals that the chemical state of Bi is +3 during initial trapping (before the atomizat...