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Öğe Çeşitli gıda ürünlerinde bazı gıda boyalarının ve eser elementlerin ön ayrılması ve tayinleri(Niğde Ömer Halisdemir Üniversitesi / Fen Bilimleri Enstitüsü, 2017) Bişgin, Abdullah Taner; Uçan, Mustafa; Narin, İbrahimBu çalışmanın büyük bir kısmında; sunset yellow, tartrazin ve allura red gıda boyalarının tayini için Amberlite XAD-1180 ve Amberlite XAD-16 ticari polimerik reçinelerini kullanarak ayrı ayrı katı faz ekstraksiyon metotları geliştirilmiştir. Metotların pH, örnek ve eluent akış hızları, örnek hacimleri ve eluent türleri gibi parametreleri incelenmiş ve optimum koşullar araştırılmıştır. Optimum koşullarda metotların gözlenebilme ve tayin sınırları belirlenmiş, yabancı iyon ve boyaların analize etkisi araştırılmıştır. Geliştirilen tayin metotları ile çeşitli gıda ve ilaç örneklerinde sunset yellow, tartrazin ve allura red tayini analit ilavesi tekniği ile yapılmıştır. Yine bu çalışmada Nevşehir ve Niğde yörelerinde doğal olarak yetişen yenilebilir 16 farklı tür mantar örneği toplanmıştır. Mantar örnekleri mikrodalga yakma ünitesinde çözünürleştirildikten sonra Cu, Mn, Zn, Fe, Bi, Cd, Pb, Cr ve Ni içerikleri alevli atomik absorpsiyon spektrofotometresi ile tayin edilmiştir. Sonuçlar kuru ağırlık esas alınarak (µg/g) verilmiş ve literatürde daha önceden eser metal içeriği tayin edilmiş mantarların analizleri ile karşılaştırılmıştır.Öğe Cloud Point Extraction and Spectrophotometric Determination of Allura Red (E129) in Foodstuffs(2018) Bişgin, Abdullah TanerA new cloud point extraction method was developed for preconcentration of allura red food dyeas a prior step to its spectrophotometric determination by UV-Vis spectrometry. Allura red was determined at 506nm. Extraction parameters such as H2SO4 and surfactant concentrations, equilibration time and temperature wereinvestigated and optimized. Interference efects of matrix components were investigated. Preconcentration factor ofthe method was obtained as 25. The relative standard deviations of the method were lower than 6%. Detection limitand quantitation limit of the method were determined as 3.0 and 8.5 ng mL-1, respectively. Linear calibration curvewas plotted in the range of 0-6 µg mL-1. Finally, the method was successfully applied to foodstuffs to determinethe allura red contents of energy drink, candy, drink powder, syrup and jelly samples. Allura red concentrations offoodstuffs were determined between 9-499 µg g-1 and 47-231 µg mL-1 for solid and liquid samples, respectivelyÖğe Determination and evaluation of Cu, Mn, Zn, Cd, Pb and Ni contents in wild-grown edible mushroom species from Cappadocia, Turkey(2021) Narin, İbrahim; Bişgin, Abdullah Taner; Tuzen, Mustafa; Uçan, Mustafa; Mendil, Durali; Soylak, MustafaThe aim of this study was to determine the Cu, Mn, Zn, Cd, Pb and Ni concentrations in sixteen different wild-grown edible mushroom species grown in Niğde and Nevşehir. In the sample preparation step, the samples were dried, ground and sieved by 200 meshed sieve, consecutively. The extractions of metals were conducted by acid mineralization using concentrated nitric acid and hydrogen peroxide in microwave digestion unit. The determinations of metals were performed by flame atomic absorption spectrometry. Among the mushroom samples that were analyzed, Cu, Mn, Zn, Cd, Pb, and Ni concentrations were determined in the range of 6.7-1353, 4.7-109, 44.8-406, 0.14-6.4, 4.28-25.6 and 1.7-11.0 mg/kg, respectively. The accuracy and precision of the proposed method for metal determinations were validated by using the NIST SRM 1573a Tomato Leaves certified standard material. The obtained results were evaluated in terms of human health and compared with each other and previously reported values in the literature. In addition, the habitats of the mushroom samples were identified.Öğe Selective microextraction of erythrosine (E127) in foodstuffs using a new generation high-density type-V deep eutectic solvent(Elsevier Ltd, 2025) Kaçanbüre, Damla; Bişgin, Abdullah TanerA novel and selective (deep eutectic solvent) DES-based microextraction method was established for the first time, utilizing a synthesized new generation High-Density Type-V DES for monitoring the dye Erythrosine (E127) in various foodstuffs and drugs. Type-V DES was created from acetophenone and diphenylamine at 3:1 M ratio. The pH, DES amount, and vortex time were optimized using Box-Behnken Design (BBD) of Response Surface Methodology (RSM). The quadratic microextraction model with R2 = 0.9982 was obtained. The limit of detection, preconcentration factor and linear dynamic range were determined to be 12 ?g/L, 50 and 41–4000 ?g/L, respectively. Effects of matrix components were examined. The developed High-Density Type-V Deep Eutectic Solvent Microextraction (HD-V-DES-ME) method was applied to foodstuffs and drugs to monitor their E127 contents and subsequently validated by applying spiked tests to real samples, with recoveries ranging between 94 and 101 %. The indexes of environmental friendliness and practicality for the method were evaluated using the Analytical GREEnness metric approach tool (AGREE) and the Blue Applicability Grade Index tool (BAGI), respectively. © 2024 Elsevier LtdÖğe Simultaneous preconcentration and determination of Cu2+, Ni2+ and Cd2+ by micelle mediated extraction in food and water samples(Sociedad Chilena de Quimica, 2016) Bişgin, Abdullah Taner; Sürme, Yavuz; Uçan, Mustafa; Narin, IbrahimAn effective extraction procedure based on the complexation of Cu2+, Cd2+, and Ni2+ with dithizone and extraction of these complexes by Tergitol NP-7 surfactant was developed. Micelle mediated extraction parameters such as pH, ligand and surfactant concentration, incubation time and temperature were investigated and optimized. Effects of external and internal interfering ions, linear dynamic range, detection and quantitation limits were examined and determined under optimal conditions. Detection limits were found as 0.5, 1.8 and 2.0 mg L-1 for Cu2+, Ni2+ and Cd2+, respectively. Linear dynamic range values were between 0.125-2, 0.125-2.5 and 0.05-1.4 ?g mL-1 for Cu2+, Ni2+ and Cd2+ ions, respectively. Applicability, accuracy and precision of the method were checked with standard reference materials and real sample analyses by analyte addition technique. Finally, optimized method was applied to determine Cu2+, Ni2+ and Cd2+ contents of standard reference materials, mushrooms and water samples. Quantitative and accurate results were obtained from the analysis of standard reference materials and real samples. © 2016, Sociedad Chilena de Quimica. All rights reserved.Öğe Vortex-assisted ionic liquid-based dispersive liquid-liquid micro-extraction and spectrofluorometric determination of Rhodamine B in anti-freeze, lipstick, liquid soap, matches and red pencil core(2020) Bişgin, Abdullah TanerA simple, centrifugeless vortex-assisted ionic liquid-based dispersive liquid-liquid micro- extraction method was developed for spectrofluorometric determination of Rhodamine B dye. Analytical extraction parameters including pH, type and amount of ionic liquid, salt concentration, vortex rate and time were examined and optimized. Matrix effects of potentially interfering ions and dyes were investigated and their tolerable concentrations were determined by applying optimum conditions. Detection limit and preconcentration factor were determined 0.01 ?g L-1 and 30, respectively. Dynamic range of the method was linear at RhB concentration range between 0.025 and 1000 ?g L-1. Relative standard deviations were 3.9% for the ten replicates measurements of 0.125 ?g L-1 Rhodamine B. The method was successfully applied to different samples including anti-freezes, liquid soap, matches, red pencil core and lipsticks. RhB concentrations of liquid and solid samples were determined between 2.05 ?g mL-1 and 10.05 ?g mL-1 and 307 ?g g-1 and 2.75 mg g-1, respectively.
