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Öğe A homogeneous liquid-liquid microextraction based on temperature-controlled ionic liquid for the accurate and selective determination at low levels of zineb residues in foodstuff by using experimental design(Taylor & Francis Ltd, 2023) Altunay, Nail; Tuzen, Mustafa; Lanjwani, Muhammad FarooqueA simple and homogeneous green liquid-liquid microextraction based on temperature-controlled ionic liquid (IL) process was developed for the selective extraction and spectrophotometric analysis of zinc (II) ethylenebis (dithiocarbamate) (zineb) from different foodstuff samples including rice, wheat, corn, oat, cabbage, potato, tomato and grain. The effect of various parameters like pH, IL dose, temperature, ultrasound time and foreign ions were studied. The proposed method exhibited good precision and accuracy for extraction recovery of zineb. The samples were spiked with 50 and 150 mu g of zineb and checked its effects on the recovery of zineb. The LOD 9.1 ng mL(-1), LOQ 30 ng mL(-1), linear range 30-600 ng mL(-1), enhancement factor 152 and RSD % values were found 3.2%. The multivariate statistical analysis was also carried out to interpret the data. The factorial design was used to examine the impacts of variables on extraction recovery of zineb from foodstuff.Öğe Advancements and innovations in solvent-based extraction techniques(Elsevier, 2024) Lanjwani, Muhammad Farooque; Khuhawar, Muhammad Yar; Tuzen, Mustafa; Fesliyan, Seçkin; Altunay, NailThe extraction techniques are very effective separation procedures and are widely employed in various applications in the field of chemistry. The applications of extraction techniques include waste treatment, food engineering, pharmaceutical, biological and environmental sample analyses. The preparation of samples is crucial part of analytical process. The extraction processes involve many solvents to extract the different samples. The selection of solvents are therefore important, because many solvents are toxic which are used in extraction process. These solvents may produce hazardous and toxic waste though consuming huge volume and are harmful for environment. The developing a new environmentally friendly solvent is a great important in the filed chemistry to decrease the number of anthropogenic actions associated to analytical laboratories. There are many novel eco-friendly solvents applied as extractant phases. These solvents, are more eco-friendly, low cost, simple, provide the low extraction times with well selectivity. In this chapter we discuss a number of solvents used in the extraction techniques such as deep eutectic solvents (DESs), supramolecular solvents, switchable solvents, ionic liquids (ILs), supercritical fluids used as solvents. © 2025 Elsevier Inc. All rights reserved.Öğe Air-Assisted Alkanol-Based Nanostructured Supramolecular Liquid-Liquid Microextraction for Extraction and Spectrophotometric Determination of Morin in Fruit and Beverage Samples(Springer, 2022) Demir, Ozge; Tuzen, Mustafa; Altunay, Nail; Mogaddam, Mohammad Reza AfsharA new air-assisted liquid-liquid microextraction method based on alkanol nanostructured supramolecular solvents coupled to spectrometric analysis was developed for extraction, preconcentration, and spectrophotometric determination of morin. Al(III)-morin complex was performed at pH 4.5. Four different alkanol-based SUPRAS (supramolecular solvents) were prepared for the separation and preconcentration of Al-morin complex from aqueous solution by using vortex and centrifugation. Effect of analytical variables and tolerance limit of matrix ions were investigated. Under the optimum conditions, detection limit, quantification limit, relative standard deviation, preconcentration factor, and enhancement factor were found as 3.5 mu g L-1, 10 mu g L-1, 3.1%, 120, and 95, respectively. The accuracy of the method was performed with standard addition. The obtained results demonstrated the applicability of the method for the separation, preconcentration, and determination of morin in fruit and beverage samples. The method also complies with green chemistry principles as it uses green solvents, reduces reagent volumes, and produces low amounts of waste.Öğe Air-assisted liquid-liquid microextraction of total 3-monochloropropane-1,2-diol from refined edible oils based on a natural deep eutectic solvent and its determination by gas chromatography-mass spectrometry(Elsevier, 2021) Nemati, Mahboob; Altunay, Nail; Tuzen, Mustafa; Farajzadeh, Mir Ali; Nabil, Ali Akbar Alizadeh; Lotfipour, Farzaneh; Mogaddam, Mohammad Reza AfsharIn this paper, a fast, sensitive, and selective sample preparation procedure was presented for the determination of 3-monochloropropane-1,2-diol (3-MCPD) in refined edible oils using gas chromatographymass spectrometry. In this method, firstly, the sample lipids and analyte fatty esters are saponified by sodium hydroxide under sonication. After that the analyte was derivatized using phenylboronic acid (as the derivatization agent) and the obtained derivative was extracted during an air-assisted liquid-liquid microextraction procedure (AALLME). Six different deep eutectic solvents (DESs) were prepared as the extraction solvents and the most effective extraction for 3-MCPD was obtained in the presence of a natural DES (NDES) consisting of choline chloride (ChCl)-acetic acid (AcOH). Important variables such as sodium hydroxide concentration and volume, sonication time, temperature, extraction solvent type and volume, and phenylboronic acid concentration and volume have been optimized. Using the optimum conditions, broad linear range (0.88-1000 ng g(-1)), suitable coefficient of determination (0.995), and low limits of detection (0.26 ng g(-1)) and quantification (0.88 ng g(-1)) were obtained. Relative standard deviations for intra- (n=8) and inter-day (n=6) precisions at a concentration of 5 ng g(-1) were 2.6 and 3.2%, respectively. The developed method has been successfully applied to 3-MCPD determination in refined edible oil samples including sunflower, corn, and canola oils. (C) 2021 Elsevier B.V. All rights reserved.Öğe Combination of doped amorphous carbon based dispersive solid phase extraction with ionic liquid-based DLLME for the extraction of aromatic amines from leather industries wastewater; Theoretical and experimental insights(Elsevier, 2023) Nemati, Mahboob; Farajzadeh, Mir Ali; Altunay, Nail; Tuzen, Mustafa; Kaya, Sava; Maslov, Mikhail M.; Mogaddam, Mohammad Reza AfsharIn the present investigation, combination of dispersive solid phase extraction with ionic liquid-based dis-persive liquid-liquid microextraction was used for the extraction of several aromatic amines from leather industries wastewater. In this approach, initially, N and S doped carbon was used for the adsorption of the analytes from the sample solution and then they were concentrated by the subsequent microex-traction step. Determination of the extracted analytes was performed using high performance liquid chromatography-ultraviolet detector. The sorbent contact area with the sample solution was enhanced by performing aspiration/dispersion cycles. In the microextraction procedure, the analytes were enriched into a few microliters of an ionic liquid. Also, interactions between some ionic liquids and the studied aromatic amines were analyzed in the light of performed density-functional theory calculations. The cal-culated quantum chemical parameters and binding energies for the interactions between ionic liquids of the selected amines showed that the analytes interact powerful with the mentioned ionic liquids and it favorite for the method. The optimized method validation was followed by evaluating several figures of merit and the obtained data showed that limits of detection and quantification, precision (expressed as relative standard deviation), enrichment factor, and extraction recovery were in the ranges of 0.25- 0.71 and 0.86-2.4 ng/mL, 3.9-5.2%, 252-312, and 63-78%, respectively. The introduced approach was used in determination of the analytes in the wastewater samples collected from leather manufacturers and p-anisidine, p-chloroaniline, and diethylaniline were determined in them, successfully.(c) 2023 Elsevier B.V. All rights reserved.Öğe Determination of uranium in water samples with chromogenic reagent 4-(2-thiazolylazo) resorcinol after ionic liquid based dispersive liquid liquid microextraction(SPRINGER, 2016) Bagda, Esra; Tuzen, MustafaA simple extraction and spectrophotometric determination of trace amount of uranium was described. The method is based on complex formation between uranium and 4-(2-thiazolylazo)resorcinol (TAR), a well known ligand, C9H7N3O2S, and preconcentration of formed complex into a room temperature ionic liquid (RTIL), 1-methyl-3-octylimidazolium hexafluorophosphate. Under optimum conditions, the method is linear in the range of 7.14-1429 A mu g L-1, and 3S (b)/m value was calculated as 0.26 A mu g L-1. The method was applied to uranium spiked water samples. To the best of knowledge, the use of TAR as chromogenic agent with 1-methyl-3-octylimidazolium hexafluorophosphate as extractive medium is the first for the versatile determination of uranium. The accuracy of the method was confirmed with certified reference material (TM 28.3 fortified water).Öğe Determination of zirconium in water, dental materials and artificial saliva after surfactant assisted dispersive ionic liquid based microextraction(ROYAL SOC CHEMISTRY, 2015) Bagda, Esra; Tuzen, MustafaIn this study, an extractive spectrophotometric method is proposed for the determination of trace amounts of zirconium. The method is based on the complex formation between zirconium and 2-(5-bromo-2-pyridylazo)-5-(diethylamino) phenol. Then, the formed complex is concentrated in an ionic liquid (1-hexyl-3-methylimidazolium hexafluorophosphate) phase. The parameters were optimized and analytical figures of merit were obtained. The tolerance limits for diverse ions were calculated. The enhancement factor (EF) and limit of detection (LOD) were found to be 156 and 0.012 mu g L-1, respectively. The relative standard deviation (RSD) was found to be lower than 6%. The proposed method has been successfully applied to water and environmental materials.Öğe Development of dispersive solid-liquid extraction method based on organic polymers followed by deep eutectic solvents elution; application in extraction of some pesticides from milk samples prior to their determination by HPLC-MS/MS(Elsevier, 2022) Nemati, Mahboob; Tuzen, Mustafa; Farazajdeh, Mir Ali; Kaya, Savas; Mogaddam, Mohammad Reza AfsharAn effective extraction procedure based dispersive solid phase extraction was developed for the extraction of different pesticides (dimethoate, imidacloprid, pirimicarb, carbaryl, fenitrothion, hexythiazox, and phosalone) from milk samples. The analytes were determined by high performance liquid chromatography-tandem mass spectrometry. In this method, an organic polymer (polystyrene) was dissolved in a water-miscible organic solvent (tetrahydrofuran) and it was injected into the aqueous phase obtained from milk sample after deprotonation. By this action the sorbent (polymer) was precipitated and dispersed in the solution as tiny particles. By doing so, the pesticides were adsorbed onto the sorbent. After that, the sorbent was separated by centrifugation and the adsorbed analytes were eluted by tetrabutylammonium chloride: dichloroacetic acid deep eutectic solvent. After optimization, the method validation was followed according to Food and Drug Administration and International Research Council guidelines and the results showed that wide linear ranges (0.93-500 ng/mL) and low limits of detection (0.09-0.27 ng/mL) and quantification (0.31-0.93 ng/mL) were obtained. Extraction recoveries and extraction and enrichment factors were in the ranges of 81-94% and 162-188, respectively. Relative standard deviations were less than 9% for intra- (n = 6) and inter-day (n = 6) precisions at three concentration of 2, 5, and 25 ng mL(-1) of each analyte. The developed method was successfully applied to twenty cow milk samples for determination of the pesticides. (C) 2022 Elsevier B.V. All rights reserved.Öğe Development of sensitive and accurate solid-phase microextraction procedure for preconcentration of As(III) ions in real samples(Nature Portfolio, 2021) Elik, Adil; Tuzen, Mustafa; Hazer, Baki; Kaya, Savas; Katin, K. P.; Altunay, NailWe synthesized the poly(methyl methacrylate-co-2-aminoethyl methacrylate (PMaema) amphiphilic copolymer in a form of solid phase adsorbent. Then it was used for separation, preconcentration and determination of trace amount of As(III) ions from foods and waters with hydride generation atomic absorption spectrometry. The PMaema was characterized by fourier transform infrared spectrometer and nuclear magnetic resonance spectrometer. The adsorption of As(III) to the PMaema was also supported using computational chemistry studies. The experimental parameters (pH, PMaema amount, adsorption time and ethanol volume) were optimized using a three-level Box-Behnken design with four experimental factors. We observed linear calibration curve for the PMaema amount in the 10-500 ng L-1 range (R-2=0.9956). Limit of detection, preconcentration factor and sorbent capacity of PMaema were equal to 3.3 ng L-1, 100 and 75.8 mg g(-1), respectively. The average recoveries (spiked at 50 ng L-1) changes in the range of 91.5-98.6% with acceptable relative standard deviation less than 4.3%. After validation studies, the method was successfully applied for separation, preconcentration and determination of trace amount of As(III) from foods and waters.Öğe Development of sodium hydroxide-induced homogenous liquid-liquid extraction-effervescent assisted dispersive liquid-liquid microextraction based on deep eutectic solvents; Application in the extraction of phytosterols from cow cream samples(Academic Press Inc Elsevier Science, 2022) Nemati, Mahboob; Tuzen, Mustafa; Altunay, Nail; Farajzdeh, Mir Ali; Abdi, Fardin; Mogaddam, Mohammad Reza AfsharIn this study, sodium hydroxide-induced homogenous liquid-liquid extraction was combined with effervescent assisted-dispersive liquid-liquid microextraction and used for the extraction of phytosterols (lupeol, beta-sitosterol, stigmasterol, campesterol, and brassicasterol) from cream samples. Two types of deep eutectic solvents (watermiscible and water-immiscible solvents) were prepared and used in the extraction procedure. In this approach, firstly, the sample was dissolved in a mixture of n-hexane and tetrabutylammonium bromide: ethylene glycol deep eutectic solvent (as extraction/disperser solvent) and a homogenous solution was obtained. After that, a few microliters of sodium hydroxide solution (as fatty acid saponification and phase separation agent) was quickly injected into the mixture. By doing so, a three-phase system was formed. Then, the supernatant phase (tetrabutylammonium bromide: ethylene glycol deep eutectic solvent) was removed and mixed with tetrabutylammonium bromide: dichloroacetic acid: octanoic acid deep eutectic solvent. The obtained solution was applied in the microextraction step. To obtain effective, reliable, robust, accurate, and precise analytical results, the effective parameters for the presented method were investigated and optimized in detail. Detection limits, extraction recoveries, and enrichment factors were in the ranges of 0.06-0.26 mu g kg(-1), 86-93 %, and 215-232, respectively. Intra- and inter-day repeatabilities were investigated at a concentration of 1.5 mu g kg(-1) (each analyte) and they were in the ranges of 5.3-7.5 and 7.2-8.8 %, respectively. Finally, the presented method was easily used in determination of the phytosterols in cow milk cream samples.Öğe Effective uranium biosorption by macrofungus (Russula sanguinea) from aqueous solution: equilibrium, thermodynamic and kinetic studies(SPRINGER, 2018) Bagda, Esra; Sari, Ahmet; Tuzen, MustafaRussula sanguinea (R. sanguninea) macrofungus was employed as a novel cost-effective biosorbent for efficient removal of U(VI) ions from aqueous solution. FT-IR spectroscopy and SEM/EDS technique were used for morphological and chemical characterizations. The maximum adsorption capacity of the macrofungus was found as 174.3 mg/g at pH 5 and 20 A degrees C. The kinetic data best fit with the pseudo-second-order kinetic model (r (2) > 0.99 for the studied temperatures). The exothermic and spontaneous nature of the biosorption process was confirmed by the thermodynamic findings. The reusability test demonstrated that the macrofungus had a good sorption/desorption performance.Öğe Equilibrium, thermodynamic and kinetic investigations for biosorption of uranium with green algae (Cladophora hutchinsiae)(ELSEVIER SCI LTD, 2017) Bagda, Esra; Tuzen, Mustafa; Sari, AhmetRemoval of toxic chemicals from environmental samples with low-cost methods and materials are very useful approach for especially large-scale applications. Green algae are highly abundant biomaterials which are employed as useful biosorbents in many studies. In the present study, an interesting type of green algae, Cladophora hutchinsiae (C. hutchinsiae) was used for removal of highly toxic chemical such as uranium. The pH, biosorbent concentration, contact time and temperature were optimized as 5.0, 12 g/L, 60 min and 20 degrees C, respectively. For the equilibrium calculations, three well known isotherm models (Langmuir, Freundlich and Dubinin-Radushkevich) were employed. The maximum biosorption capacity of the biosorbent was calculated as about 152 mg/g under the optimum batch conditions. The mean energy of biosorption was calculated as 8.39 kJ/mol from the D-R biosorption isotherm. The thermodynamic and kinetic characteristics of biosorption were also investigated to explain the nature of the process. The kinetic data best fits the pseudo-second-order kinetic model with a regression coefficient of > 0.99 for all studied temperatures. The calculated Delta H degrees and Delta G degrees values showed that the biosorption process is exothermic and spontaneous for temperatures between 293 and 333 K. Furthermore, after seven cycling process, the sorption and desorption efficiencies of the biosorbent were found to be 70, and 58%, respectively meaning that the biosorbent had sufficiently high reusability performance as a cleanup tool. (C) 2017 Elsevier Ltd. All rights reserved.Öğe Experimental and density functional theoretical modeling of triazole pesticides extraction by Ti2C nanosheets as a sorbent in dispersive solid phase extraction method before HPLC-MS/MS analysis(Elsevier, 2022) Khosrowshahi, Elnaz Marzi; Mogaddam, Mohammad Reza Afshar; Javadzadeh, Yousef; Altunay, Nail; Tuzen, Mustafa; Kaya, Savas; Ghalkhani, MasoumehIn this research, a convenient, fast, and green dispersive solid phase extraction procedure based on Ti2C nanosheets was developed for effectively enrichment of some triazole pesticides prior to high performance liquid chromatography-tandem mass spectrometry. Characterization of the etching sorbent was carried out in details. Adsorption and desorption steps have been optimized in detail to obtain efficient phase separation and reliable analytical results. Under optimized conditions, the presented method exhibited a wide working range (0.52-1000 ng mL(-1)), low detection limits (0.03-0.30 ng mL(-1)) and acceptable extraction recoveries (70-75%). The introduced method precision was checked by calculating intra and inter-day relative standard deviations for three different concentrations of triazole pesticides. The matrix effect was investigated by the recovery study. Following validation studies, the presented method was successfully applied to the extraction and determination of the studied triazole pesticides from fruit juice samples. The adsorption mechanism was supported by theoretical studies. The interactions between the studied pesticides and Ti2C nanosheets were investigated with the help of density functional theoretical calculations. The calculations supported the obtained experimental results.Öğe Experimental and density functional theory studies during a new solid phase extraction of phenolic compounds from wastewater samples prior to GC-MS determination(Elsevier, 2022) Farajzadeh, Mir Ali; Nemati, Mahboob; Altunay, Nail; Tuzen, Mustafa; Kaya, Savas; Kheradmand, Farzad; Mogaddam, Mohammad Reza AfsharIn this work a commercial polymer-based dispersive solid phase extraction approach has been used in phenolic compounds extraction from wastewater samples. In the extraction procedure, firstly the sorbent (poly-vinylpyrrolidone) forms a homogenous solution with aqueous phase contacting the analytes and then its solubility was decreased by adding sodium chloride which leads to its dispersion into the aqueous solution as tiny particles. During this step, the investigated phenolic compounds were adsorbed onto the polymer. Then, a deep eutectic solvent synthesized from choline chloride and alpha-terpineol was used for elution of the compounds from the polymer surface. Optimization of the effective factors showed that the subsequent conditions are suitable for extraction of the analytes: sorbent (polyvinylpyrrolidone) amount, 125 mg; sample solution pH, 4; NaCl concentration, 20%, w/v; and desorption solvent volume, 75 mu L. Acceptable figures of merit consist of limits of detection and quantification in the ranges of (0.13-0.36 ng/mL and 0.43-1.2 ng/mL, relative standard deviations <= 6%, and extraction recovery and enrichment factor in the ranges of 60-92% and 80-122 were obtained. The powers of the interactions between the studied chemical species were analyzed with the help of Conceptual Density Functional Theory calculations and important quantum chemical parameters related to the chemical reactivity. The obtained theoretical data were in a good agreement with experimental observations.Öğe Experimental and theoretical observations in a mixed mode dispersive solid phase extraction of exogenous surfactants from exhaled breath condensate prior to HPLC-MS/MS analysis(Elsevier, 2023) Khoubnasabjafari, Maryam; Altunay, Nail; Tuzen, Mustafa; Katin, Konstantin P.; Farajzadeh, Mir Ali; Kaya, Savas; Hosseini, MohamadbagherA mixed mode dispersive solid phase extraction method was introduced for the extraction of three lung surfactants from exhaled breath condensate samples. Considering the trends to green analytical chemistry, organic polymers including polystyrene (PS), polymethylmethacrylate (PMMA-15 K), and polymethylmethacrylate (PMMA-45 K) were utilized as the sorbent for extraction of the analytes. The extraction capability for each polymer toward the studied analytes was evaluated using simplex centroid design. Based on the results, a mixture of sorbents consisting of PS, PMMA-15 K, and PMMA-45 K mixture with the mass ratio of 1:2:1: w/w/w was selected as the suitable sorbent. The effective parameters influencing the method's efficiency were investigated and optimized. Based on the figure of merit for the developed method, the calibration curves were linear in the concentration range of 0.76-10 0 0 ng mL -1 and limits of detection were from 0.09 to 0.19 ng mL -1 . The method repeatability was investigated at three concentrations as inter- and intra-day precisions and the obtained data showed that they were in the ranges of 5.2-9.1 and 4.2-8.9%, respectively. The enrichment factors were in the range of 88-100. The developed method was successfully employed in the analysis of the surfactants in the exhaled breath samples of three premature infants collected from the expiratory circuits of the mechanical ventilators. The nature of the chemical interactions with PMMA-PS complex system of the surfactants was investigated through Density Functional Theory calculations. Calculated binding energies showed that PMMA-PS complex system exhibit high performance in the extraction of lung surfactants. The most powerful interaction is between PMMA-PS complex system and 1-palmitoyl-2-oleoylsn-glycero-3-phosphocholine.(c) 2023 Elsevier B.V. All rights reserved.Öğe Factorial design, physical studies and rapid arsenic adsorption using newly prepared polymer modified perlite adsorbent(Elsevier, 2022) Saleh, Tawfik A.; Tuzen, Mustafa; Sari, Ahmet; Altunay, NailIn this work, expanded perlite (EP) was modified with a polymer of trimesoyl chloride and phenylenediamine, and evaluated as a novel competent adsorbent for aquatic arsenic (As (III)) removal. The chemical structure and morphology of the developed polymer-modified EP (PM-EP) adsorbent were investigated by Fourier transform infrared spectroscopy, as well as scanning electron microscope /energy equipped with dispersive X-ray spectroscope. The conditions of batch removal such as the solution pH, contact time, sorbent dosage, and initial As(III) concentration were analyzed by factorial design. Based on the non-linear and linear Langmuir model that well correlates equilibrium data, the removal capacity of the produced PM-EP adsorbent was estimated as 447.9 mg g-1 and 454.5 mg g-1, respectively at optimized conditions (pH: 6; contact time: 60 min; adsorbent dosage: 10 g L-1 and temperature: 24 degrees C). The As(III) adsorption mechanism onto PM-EP adsorbent was well described by the non-linear pseudo-second-order kinetic model. The prepared PM-EP adsorbent was subjected to a ten cycling-adsorption/desorption test and the results demonstrated that it had appreciated reuse performance until seven cycles. The removal efficiency of PM-EP was determined in the case of wastewater samples. The overall evaluation suggested that the synthesized PM-EP adsorbent could be a powerful alternative adsorbent for decontamination of As(III) ions from wastewaters and drinking waters.(c) 2022 Institution of Chemical Engineers. Published by Elsevier Ltd. All rights reserved.Öğe Headspace ?-solid phase extraction of 1,4-dioxane and 2-methyl-1,3-dioxolane from shampoo samples in a home-mode device and large volume injection of deep eutectic solvent: Theoretical and experimental studies(Elsevier, 2022) Mogaddam, Mohammad Reza Afshar; Altunay, Nail; Tuzen, Mustafa; Katin, Konstantin P.; Nemati, Mahboob; Lotfipour, FarzanehIn the current study, a headspace micro solid-phase extraction was developed for extraction of 1,4-dioxane and 2-methyl-1,3-dioxolane from shampoo samples. After extraction, the quantities of analytes were determined using the large volume injection method followed by gas chromatography-flame ionization detector. Octadecylsilane, menthol: formic acid deep eutectic solvent, and 1,3-dioxane were used as adsorbent, eluent, and internal standard, respectively. Under optimum conditions, linear ranges for target analytes were from 0.30 to 5000 ng mL-1, and 0.43-5000 ng mL-1 with correlation coefficients 0.9972. The limits of detection were 0.08 and 0.11 ng mL-1 for 1,4-dioxane and 2-methyl-1,3-dioxolane, respectively. The limits of quantification were 0.28 and 0.43 ng mL-1 for 1,4-dioxane and 2-methyl-1,3-dioxolane, respectively. The intra- and inter-day precisions for target analytes at the spiked level of 25 ng mL-1 were < 4.2%. The feasibility of the recommended procedure was successfully tested for the extraction and determination of 1,4-dioxane and 2-methyl-1,3-dioxolane in shampoo samples. The extraction recoveries were ranged from 89 to 90% with relative standard deviations<5.1%. The nature of the interactions between studied chemical species was investigated in the light of conceptual density functional theoretical calculations. As to conclude, it was seen that experimental observations are compatible with the theoretical explanations made according to hard and soft (Lewis) acids and bases Principle.Öğe In-situ sorbent formation for the extraction of pesticides from honey(Wiley-V C H Verlag Gmbh, 2022) Nemati, Mahboob; Altunay, Nail; Tuzen, Mustafa; Farajzadeh, Mir Ali; Afshar Mogaddam, Mohammad RezaAn organic polymer was re-precipitated in solution to use as an adsorbent in dispersive solid-phase extraction of some pesticides from honey samples prior to their determination by high-performance liquid chromatography-tandem mass spectrometry. In this approach, different deep eutectic solvents were prepared using lysine and their ability in elution of the analytes from the adsorbent surface was tested. A diluted honey solution was transferred into a glass test tube and then a solution of polystyrene dissolved in dimethylformamide was injected into the solution. By doing this, polystyrene is re-precipitated in the solution and dispersed in whole parts of it as many tiny particles. Then the mixture was centrifuged and the adsorbed analytes on the particles were eluted using a proper hydrophilic deep eutectic solvent. The central composite design approach was used for the optimization of effective parameters. The limits of detection and quantification were in the ranges of 0.06-0.20 and 0.22-0.69 ng/g, respectively. The calibration curves obtained by matrix-matched standard solutions were linear in the range of 0.69-500 ng/g with a coefficient of determinations >= 0.9962. The method provided high extraction recoveries (70%-99%) and enrichment factors (140-198), and an acceptable precision (relative standard deviations <= 7.1%).Öğe Introduction and overview of applications related to green solvents used in sample preparation(Elsevier, 2024) Fesliyan, Seçkin; Haq, Hameed Ul; Altunay, Nail; Tuzen, Mustafa; Azooz, Ebaa Adnan; Muhamad, Zainab HassanSample preparation is critical to the entire analytical procedure because it enables precise and accurate analyte evaluation by removing matrix challenges. Traditional sample preparations are regarded as the costliest, most time-consuming, and most hazardous organic solvents. Using environmentally friendly solvents in analytical methods for sample preparation and following green analytical chemistry principles adds greatly to the advancement of green analytical approaches. Utilizing their solvation characteristics and greenness benefits, these sustainable natural solvents can be designed as potential extractant for their targeted applications, permitting efficient and safe sample preparation before instrumental evaluation. In this chapter, we offer a brief overview of recent developments in the prominent environmentally friendly solvents used in analytical methods. The amphiphilic solvents, supramolecular solvents, hydrophilicity switchable solvents, ionic liquids, and deep eutectic solvents were explained. as well as applications of green solvents, paired with different methods for extremely selective and sensitive assessment. Lastly, we examine potential prospects in this field. © 2025 Elsevier Inc. All rights reserved.Öğe Investigation of vortex assisted magnetic deep eutectic solvent based dispersive liquid-liquid microextraction for separation and determination of vanadium from water and food matrices: Multivariate analysis(Elsevier, 2024) Altunay, Nail; Lanjwani, Muhammad Farooque; Tuzen, Mustafa; Boczkaj, GrzegorzA new and simple vortex assisted magnetic deep eutectic solvent dispersive liquid-liquid microextraction procedure (VA-MDES-DLLME) was developed for the determination of vanadium (V) in food and water samples by flame atomic absorption spectrometry (FAAS). In the extraction medium, a bis(acetylpivalylmethane) ethylenediimine (H2APM2en) was used for the complexation of V(V) in sample solution at pH 6. The VA-MDESDLLME was optimized by different operation parameters, pH level of solution, MDESs volume, vortex time, concentration of complexing agent and samples volume. The accuracy of VA-MDES-DLLME was confirmed by analysis of certified reference materials (CRMs) and standard additional method in respect to real samples. The detection limit, quantification limit and enhancement factor were found 0.3, 1.0 ng mL-1 and 120, respectively. The linearity was confirmed for wide concentration range from 1 to 600 ng mL-1 and relative standard deviation (RSD) is 2.8 %. The multivariate statistical analysis was used for factorial design to explore the effects of extraction parameters on recovery of V(V) and also significant level of variables.
