Yazar "Mogaddam, Mohammad Reza Afshar" seçeneğine göre listele

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    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 Afshar
    A 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.
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    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 Afshar
    In 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.
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    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 Afshar
    In 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.
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    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 Afshar
    An 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.
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    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 Afshar
    In 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.
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    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, Masoumeh
    In 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.
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    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 Afshar
    In 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.
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    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, Farzaneh
    In 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.
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    Synthesis of carbon modified with polymer of diethylenetriamine and trimesoyl chloride for the dual removal of Hg (II) and methyl mercury ([CH3Hg]+) from wastewater: Theoretical and experimental analyses
    (Elsevier Science Sa, 2022) Tuzen, Mustafa; Sari, Ahmet; Mogaddam, Mohammad Reza Afshar; Kaya, Savas; Katin, K. P.; Altunay, Nail
    A novel adsorbent was synthesized by modification of waste rubber tiers derived activated carbon (AC) with diethylenetriamine (DETA)-trimesoyl chloride (TMC) copolymer. The synthesized AC/DETA-TMC nanocomposite was characterized by FT-IR and SEM/EDX techniques. Dependency of the adsorption yield on the batch parameters was studied via factorial design method. From the non-linear Langmuir isotherm model, the adsorption capacity of the AC/DETA-TMC nanocomposite was determined as 317.3 and 263.6 mg g 1 for inorganic mercury (Hg2+) and organic mercury (methyl mercury; [CH3Hg]+, respectively. The adsorption kinetic mechanism of both mercury species was recognized well by the PSO model. The thermodynamic calculations verified that the adsorption processes progressed spontaneously and exothermically. The cycling adsorption/ desorption treatments exposed that the produced nanocomposite showed still reusable performance in moderate level until seven cycles. The nanocomposite demonstrated high removal performance in case of wastewater samples. To investigate the power of the interactions between studied chemical species, DFT calculations were performed and adsorption energies were calculated. It is important to note that theoretical results support the experiments made.
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    Ultrasonic-assisted dispersive liquid-liquid microextraction based on hydrophilic deep eutectic solvents: Application to lead and cadmium monitoring in water and food samples
    (Taylor & Francis Ltd, 2022) Altunay, Nail; Tuzen, Mustafa; Mogaddam, Mohammad Reza Afshar
    A green and innovative ultrasonic-assisted dispersive liquid-liquid microextraction using hydrophilic deep eutectic solvents (UA-HDES-DLLME) was developed for the selective and simultaneous extraction and enrichment of Pb (II) and Cd (II) in water and food samples for flame atomic absorption spectrometry. Several natural deep eutectic solvents (NADES) were used for the preparation of six different HDES and methyl violet was used as chelating reagent. Effective parameters such as pH, sonication time, methyl violet amount, DES type, dispersive solvent types, etc were optimized. Relative standard deviation (RSD) and preconcentration factor (PF) were 4.0% and 80. Low limits of detection (LOD, 1.3 ng mL(-1) for Pb (II) and 0.33 ng mL(-1) for Cd (II)) and quantification (LOQ, 4.0 ng mL(-1) for Pb (II) and 1.0 ng mL(-1) for Cd (II)) were found. The method accuracy was confirmed with analyses of certified reference materials.