Browsing by Author "Yilmaz, Erkan"

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Application of Deep Eutectic Solvent in Ultrasound-Assisted Emulsification Microextraction of Quercetin From Some Fruits and Vegetables
(Elsevier Science Bv, 2019) Kanberoglu, Gulsah Saydan; Yilmaz, Erkan; Soylak, Mustafa
A deep eutectic solvent ultrasound-assisted emulsification microextraction (USAEME-DES) procedure for the separation and preconcentration of quercetin in vegetable and fruit samples has been established. An alcohol-based extraction has been applied as sample pre-treatment step prior to microextraction procedure. Quercetin was extracted into DES phase (tetrabutylammonium chloride: decanoic acid (TBACI-DA, 1:3 M ratio) and analyzed by UV-VIS spectrophotometry at 370 nm. For the quantitative recoveries of quercetin, optimal pH, sample solution volume, volume and kind of DES, and ultrasonication time were 3.0, 15 mL, 250 mu L. of 1:3 M ratio of TBACI-DA acid and 5 min, respectively. The influences of matrix constituents were also studied. The developed method has a limit of detection (LOD) of 18.8 mu g L-1 and a relative standard deviation (RSD) of 5.1%. The developed procedure was applied to analysis of vegetable and fruit samples, which prepared by alcohol based extraction step. (C) 2019 Elsevier B.V. All rights reserved.
Cu2o-Cuo Ball Like/Multiwalled Carbon Nanotube Hybrid for Fast and Effective Ultrasound-Assisted Solid Phase Extraction of Uranium at Ultra-Trace Level Prior To Icp-Ms Detection
(Elsevier, 2020) Aydin, Funda; Yilmaz, Erkan; Olmez, Enver; Soylak, Mustafa
Multiwalled carbon nanotube/Cu2O-CuO ball like hybrid material (MWCNTs/Cu2O-CuO) synthesized using of a green hydrothermal process was evaluated as a new sorbent for solid phase extraction of uranium with inductively coupled plasma mass spectrometry (ICP-MS). According to our best knowledge, this new material was synthesized and used as solid phase extraction adsorbent for the first time in the literature. The characterization of new hybrid material was carried out using Raman spectroscopy, X-ray diffraction (XRD) and scanning electronic microscopy techniques (SEM, SEM-EDX and SEM-Mapping). The characterization results demonstrated that the new hybrid nanostructure was successfully obtained. The ultrasound-assisted solid phase extraction (UA-SPE) procedure was performed using 100 mg of new hybrid sorbent, 1000 mu L of a 0.1% (w/v) solution of alpha-benzoin oxime and 2000 mu L of phosphate buffer at pH 7.0 for separation and preconcentration of uranium. Uranium was eluted with 2 M HCl and the levels of uranium was measured by using ICP-MS. The linearity was observed between 2.5 and 100 ng mL(-1) concentration range with a good correlation coefficient (r = 0.999, n = 7). The obtained limit of detection and quantitation values were 0.52 and 1.70 ng mL(-1) respectively. Under optimum conditions, the preconcentration factor (PF) was calculated as 13.3. The accuracy of the developed method was assessed by analyzing of TMDA-62.2, TMDA-70.2 (Environment Canada) and GBW-07423 certified reference water and soil materials. The proposed UA-SPE-ICP-MS procedure developed with MWCNTs/Cu2O-CuO hybrid material was successfully applied to the analysis of uranium at ultra-traces levels in environmental water and geological rock samples.
Developing a New and Simple Ultrasound-Assisted Emulsification Liquid Phase Microextraction Method Built Upon Deep Eutectic Solvents for Patent Blue V in Syrup and Water Samples
(Elsevier Science Bv, 2019) Kanberoglu, Gulsah Saydan; Yilmaz, Erkan; Soylak, Mustafa
In this study, Deep Eutectic Solvents (DESs) were utilized for ultrasound -assisted emulsification liquid phase microextraction (UA-ELPME) of Patent Blue V in syrup and water samples. Patent Blue V in sample solution of pH 4.0 was extracted into DES phase prepared from choline chloride and phenol. Concentration of Patent Blue V in final DES phase was measured at 627.5 nm with Uv-Vis spectrophotometry. Sample volume, pH, matrix effect, volume and type of DES, ultrasonication and centrifugation times were investigated and optimized. The developed UA-ELPME method presents a limit of detection (LOD) of 0.37 mu g L-1, preconcentration factor of 15 and a relative standard deviation (RSD, %) of 6.0% under the optimum conditions. The validation was carried out with standard addition-recovery experiments for syrup and water samples. The obtained recovery results showed that the developed UA-ELPME method was applicable for routine Patent Blue V analysis in syrup and water samples.
Fabrication and Characterization of Sio2@fe3o4@nanodiamonds for Vortex-Assisted Magnetic Solid-Phase Extraction of Lead in Cigarette Samples Prior To Faas Detection
(Springer, 2020) Saydan Kanberoglu, Gulsah; Yilmaz, Erkan; Soylak, Mustafa
A novel, speed and accurate vortex-assisted magnetic solid-phase extraction procedure for separation-preconcentration and flame atomic absorption spectrometric determination of lead at trace levels has been proposed. Silica-coated magnetic nanodiamonds (SiO2@MNDs) as magnetic solid-phase extractor were fabricated and characterized by Fourier transform infrared spectroscopy, X-ray diffraction spectrometry and scanning electron microscopy. Pb(II) could be easily separated from the aqueous solution on the SiO2@MNDs by using a neodymium magnet. Analytical factors affecting the recoveries of Pb(II) such as pH, adsorbent amount, type and volume of eluent and sample volume were optimized. The preconcentration factor, the precision (RSD %, n = 5), the limit of detection and the limit of quantification were 5, 5.3%, 40.8 and 135 mu g L-1, respectively. The effects of matrix ions have been investigated. The presented extraction method has been applied for the determination of lead in cigarette samples and Bush Branches and Leaves certified reference material. Quantitative recoveries changing from 94 to 106% were obtained for accuracy studies.
A Simple and Novel Deep Eutectic Solvent Based Ultrasound-Assisted Emulsification Liquid Phase Microextraction Method for Malachite Green in Farmed and Ornamental Aquarium Fish Water Samples
(Elsevier Science Bv, 2017) Aydin, Funda; Yilmaz, Erkan; Soylak, Mustafa
In this work, the recently suggested concept of Deep Eutectic Solvents (DESs) as green and cheap extraction solvent was used for ultrasound-assisted emulsification liquid phase microextraction (UA-ELPME) of malachite green (MG) in farmed and ornamental aquarium fish water samples followed by UV-VIS spectrometry. In the DES-UA-ELPME, malachite green in sample solution (pH 3) was extracted into a well dispersed of microvolume of DES phase consisting of choline chloride and phenol and analyzed by UV-VIS spectrometry at 635 nm. A series of analytical factors such as pH and volume of sample solution, the type and volume of DES ultrasonication time and matrix effect that would affect the extraction efficiency was systematically examined and optimized. Under optimum conditions, the DES-UA-ELPME method offered a limit of detection (LOD) of 3.6 mu g L-1 and a relative standard deviation (RSD) of 2.7%. The procedure was validated with three aquarium and farmed fish water samples and quantitative recoveries (96-99%) were achieved. (C) 2017 Elsevier B.V. All rights reserved.
Supramolecular Solvent-Based Dispersive Liquid-Liquid Microextraction of Copper From Water and Hair Samples
(Royal Soc Chemistry, 2015) Aydin, Funda; Yilmaz, Erkan; Soylak, Mustafa
A supramolecular solvent based dispersive liquid-liquid microextraction (SM-DLLME) procedure has been established for the separation and preconcentration of Cu(II) before its determination by microsampling flame atomic absorption spectrometry. The proposed method involves the use of a supramolecular solvent in which reverse micelles of 1-decanol are dispersed in tetrahydrofuran. The Cu(II)pyrrolidinedithiocarbamate complex was formed to increase interactions with the supramolecular phase at pH 6. After the supramolecular solvent was added to the medium, the formation of micelles of nano and molecular size was observed in an ultrasonic bath. The solution was centrifuged, and the metal complex formed was extracted into the supramolecular solvent phase. Some analytical parameters that are important in the experiment were examined in detail. The detection limit (LOD), the quantification limit (LOQ) and the relative standard deviation (RSD) of the developed method were found to be 0.11 mg L-1, 0.34 mg L-1 and 2.2%, respectively. The preconcentration factor was 60. Addition/recovery studies were also performed in water and human hair samples. The accuracy of the proposed method was assessed by analyzing certified reference materials. The procedure was applied for the determination of copper in water and hair samples.
Supramolecular Solvent-Based Microextraction Method for Cobalt Traces in Food Samples With Optimization Plackett-Burman and Central Composite Experimental Design
(Royal Soc Chemistry, 2015) Aydin, Funda; Yilmaz, Erkan; Soylak, Mustafa
A new microextraction method based on formation of supramolecular solvent (Ss) was developed by using of chemometric optimization method for cobalt determination with microsampling flame atomic absorption spectrometry (MS-FAAS). 1-Decanol/THF was used to obtain supramolecular solvent, which ensure the formation of micelles in the nano and molecular size and to transfer the diethyldithiocarbamate (DDTC)-cobalt(II) complex from the aqueous phase to the extraction phase media. The optimization strategy was carried out by using of Plackett-Burman Design (PBD) and Central-Composite Design (CCD). Statistically significant parameters such as pH, the volume of ligand (DDTC), the volume of supramolecular solvent (1-decanol/THF) and centrifugation time were investigated by using of Plackett-Burman design. Central-composite design was used to determine optimal condition of these parameters. The optimum experimental conditions obtained were pH 6, 125 mu L of 1-decanol, 450 mu L of THF, 300 mL of DDTC (0.1%, w/v) and 8 min of centrifugation time. The relative standard deviation (RSD), limit of detection (LOD), limit of quantitation (LOQ) and preconcentration factor (PF) were 1.51% (n = 8, 94-98%), 1.89 mu g L-1, 6.32 mu g L-1 and 30 respectively. The method were applied to the certified reference materials of TMDA 53.3 water, TMDA 64.2 water, SPS-WW2 waste water, Oriental Basma Tobacco Leaves (INCT-OBTL-5) and scallion (salad onion), (NCS ZC73033) to validation. The microextraction method was also successfully applied to determine cobalt concentrations by microsampling FAAS in water, cereal, powdered beverage and fruit samples.
Tio2@zno Nanocomposite: Bifunctional Material for Solid Phase Extraction of U(Vi) and Th(Iv) and Photocatalytic Degradation of Organic Contaminant
(Springer, 2023) Aydin, Funda; Yilmaz, Erkan; Demirkiran, Guelay; Erbas, Zeliha; Vurucuel, Merve; Soylak, Mustafa
A bifunctional TiO2@ZnO nanorods hybrid material was synthesized via one-step hydrothermal synthesis and studied as an adsorbent for SPE of U(VI) and Th(IV) and as a photocatalyst for the photocatalytic removal of methylene blue (MB). The formation of TiO2@ZnO hybrid composite was confirmed by XRD, Raman, SEM, SEM-EDX and SEM-Mapping analysis. After determining the optimum values of the analytical parameters affecting the recovery of the analytes, the developed TiO2@ZnO hybrid NPs-SPE method was applied to natural waters with a high recovery efficiency (94-97%). The accuracy of the method was also verified by using CRM-TMDA 62.2 and TM-25.3 standards. Photocatalytic properties of the fabricated nanocomposite were investigated by degrading of MB under UV light. The results indicated that the synthesized TiO2@ZnO material can be used as a promising adsorbent/photocatalyst candidate for the adsorption of U(VI) and Th(IV) analytes in waters as well as the photocatalysis degradation of MB dyestuff.
Ultrasonic-Assisted Supramolecular Solvent-Based Liquid Phase Microextraction of Mercury as 1-(2 Complexes From Water Samples
(Taylor & Francis Ltd, 2016) Aydin, Funda; Yilmaz, Erkan; Soylak, Mustafa
A separation-preconcentration method based on supramolecular solvent ultrasonic-assisted liquid-phase microextraction (Ss-USA-LPME) for spectrophotometric determination of mercury as 1-(2-pyridylazo)-2-naphthol (PAN) chelates has been established. Red coloured Hg(II)-PAN hydrophobic complex was extracted into the supramolecular phase (1-decanol/THF) at pH 9.5. The extract was separated from aqueous phase by centrifugation, diluted with ethanol and determined by UV-Vis spectrophotometer at lambda(max) = 560 nm. The influences of important analytical parameters such as pH, amount of PAN, 1-decanol and THF, sample volume and matrix effects for the quantitative recoveries were examined and optimised. Under the optimised experimental conditions, the amount of ligand, 1-decanol and THF were 1.0 x 10(-4) M, 200 mu L and 300 mu L, respectively. The optimum time of ultrasonic bath and centrifugation were found as 2 min and 5 min. A linear calibration graph was obtained linearly in the concentration ranges of 8.31000 mu g L-1. The preconcentration factor was obtained as 20. The limit of detection (LOD) was 2.6 mu g L-1 with the relative standard deviation (RSD) of 2.4% for mercury (C = 100 mu g L-1, n = 7). The validity of the developed Ss-USA-LPME technique was checked with a certified reference material of NIST 1641d. The presented method has been successfully applied to the determination of mercury in water samples.
Usage of Deep Eutectic Solvents for the Digestion and Ultrasound-Assisted Liquid Phase Microextraction of Copper in Liver Samples
(Springer, 2018) Kanberoglu, Gulsah Saydan; Yilmaz, Erkan; Soylak, Mustafa
In this study, we used deep eutectic solvents for digestion and ultrasound-assisted emulsification liquid phase microextraction (UA-ELPME) of copper in liver samples. Different types of DESs were prepared for digestion and microextraction steps. DESs consisting of lactic acid and choline chloride for the digestion step and DESs consisting of tetrabuthylamonium chloride and decanoic acid for ultrasound-assisted emulsification liquid phase microextraction were used in this method. The liver samples were digested by using DES-based digestion method. After digestion step, Cu(II) ions in aqueous phase were complexed with sodium dimethyl dithiocarbamate (NaDMDTC) and the obtained hydrophobic complex was extracted to tetrabuthylamonium chloride-decanoic acid DES phase. A microsample injection system coupled with flame atomic absorption spectrometer (MS-FAAS) was used in the detection of copper. LOD, LOQ, PF and % RSD were determined as 4.00, 13.2 A mu g L- 1, 10 and 3.2%, respectively. The proposed microextraction procedure was successfully applied to copper contents of the liver samples.
Vortex Assisted Deep Eutectic Solvent (des)-Emulsification Liquid-Liquid Microextraction of Trace Curcumin in Food and Herbal Tea Samples
(Elsevier Sci Ltd, 2018) Aydin, Funda; Yilmaz, Erkan; Soylak, Mustafa
We developed a new microextraction method for separation and preconcentration of curcumin using deep eutectic solvent known as green solvent. Deep eutectic solvent (DES) formed by mixing of choline chloride and phenol was used as an extraction solvent in microextraction study to extract the curcumin at pH 4.0. The curcumin concentration in enriched DES phase was analyzed by UV-Visible spectrophotometer. The effect of parameters such as pH, mol ratio of DES composition, volume of DES, volume of tetrahydrofuran (THF) and sample volume were examined. Interference effects of matrix components were investigated. The preconcentration factor was 12.5. The detection limit of method (n=10) was 2.86 mu g L-1 and the relative standard deviation (RSD, n=8) was 1.8%. The method was successfully applied to determination of curcumin in food and herbal tea samples. The mean recoveries were between 96% and 102% and standard deviations were found in the range of 1-6%.