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Anoxybacillus flavithermus loaded y-Fe2O3 magnetic nanoparticles as an efficient magnetic sorbent for the preconcentrations of Cu(II) and Mn(II)
(Pergamon-Elsevier Science Ltd, 2022) Ozdemir, Sadin; Turkan, Zeynep; Kilinc, Ersin; Altuner, Elif Esra; Sen, Fatih
It was hypothesized that-iron( oxide nanoparticles (y-Fe2O3 NPs) functionalized with Anoxybacillus flavithermus (A. flavithermus) as an effective magnetic sorbent for the preconcentrations of toxic metal ions. It is clear to conclude that the main novelty of this study is that y-Fe2O3 NPs loaded with A. flavithermus is selective-specific for Cu(II), Mn(II). Structural functional groups of the samples were elucidated by FTIR, and SEM. Significant experimental parameters were investigated in detail. 0.2 mL min(-1) of flow rate, 5 mL of 1 M of hydrochloric acid as eluent, 150 mg biogenic mass sample, and 150 mg y-Fe2O3 NPs for supporting material were found as the best conditions. This developed method has been tested and verified using certified and standard reference materials. As a result of the studies, the pre-concentration factor of the Cu(II), Mn(II) metals was calculated as 40. All measurements showed that the developed solid-phase extraction (SPE) columns are available for 32 cycles. The use of y-Fe2O3 NPs equipped with A. flavithermus as an effective magnetic sorbent for the first measurements of ions was thoroughly studied. In order of the biosorption capacities were calculated as 26.0, and 30.3 mg/g for Cu (II), Mn(II), respectively. The developed method for specifying the samples showed excellent to excellent results.
Application of magnetized fungal solid phase extractor with Fe2O3 nanoparticle for determination and preconcentration of Co(II) and Hg(II) from natural water samples
(Elsevier Science Bv, 2018) Ozdemir, Sadin; Mohamedsaid, Siham Abdullah; Kilinc, Ersin; Yildirim, Aydil; Soylak, Mustafa
Pleurolus eryngii loaded Fe2O3 magnetic nanoparticles were developed as novel magnetic solid phase bio-extractors for the preconcentrations and extractions of Co(II) and Hg(II) from real samples. The metal binding surface groups of the prepared magnetic solid phase bio-extractors were investigated by FT-IR spectrometry, SEM and EDX. Several parameters influencing the magnetic extractions and preconcentrations of Co(II) and Hg (II) were examined and optimized, including pH, flow rate, quantity of P. eryngii, quantity of Fe2O3 magnetic nanoparticle, eluent type, concentration and volume, sample volume, and foreign ions. A good reusage (35 times) was obtained with the relative standard deviation (RSD) of < 5.0% for both magnetic solid phase bio-extractors. The biosorption capacities were determined for Co(II) and Hg(II) as 25.4 mg g(-1) and 30.3 mg g(-1), respectively, using P. eryngii loaded Fe2O3 magnetic nanoparticle column. The preconcentration factors for Co(II) and Hg(II) were found as 80 and 100, respectively, when using P. eryngii loaded Fe2O3 magnetic nanoparticle column. The developed procedures were validated through analysis of the certified reference materials and successfully utilized for the determinations of Co(II) and Hg(II) in real samples by inductively coupled plasma optical emission spectrometry (ICP-OES) with satisfactory results.
Bacillus sp immobilized on Amberlite XAD-4 resin as a biosorbent for solid phase extraction of thorium prior to UV-vis spectrometry determination
(Springer Wien, 2010) Ozdemir, Sadin; Erdogan, Sait; Kilinc, Ersin
A method has been developed for the preconcentration of Th prior to its determination by UV-vis spectrophotometry after complexation with Arsenazo Ill. A column was packed with Amber lite XAD-4 resin containing immobilized Bacillus sp. as a solid phase extractant. Parameters such as pH of the solution and sample, the concentration of Th, the volume and type of eluent, flow rate and effect of matrix interference were studied. The optimum pH for the sorption of Th is 5.0, and quantitative eluation occurs with 1 mol L-1 HCl. The tolerance limits of some electrolytes were also studied. The loading capacity was determined to be 17.2 mg g(-1) The method was applied to the determination of Th in real ore sample and validated by analyzing a certified reference samples (NCS DC-73350; poplar leaves).
Bioaccumulation, tolerance, and removal of U(VI) and Th(IV) by a novel thermophilic Bacillus cereus ST14 isolated from hot spring mud samples in Afyonkarahisar, Turkey
(Springer Heidelberg, 2024) Ozdemir, Sadin; Acer, Omer; Kilinc, Ersin
In this study, a novel thermophilic Bacillus cereus ST14 with heavy metal tolerance was isolated from a hot spring mud sample in Afyonkarahisar (Omer). 16S rRNA analysis revealed that strain ST14 was mostly related to Bacillus cereus strain 151,007-R3_K09_40_27F (98.18%) and Bacillus cereus strain 2 k (98.10%). We hypothesized that U(VI) and Th(IV) affected B. cereus at the cell level and that this bacterium can be used as a bioindicator. Therefore, U(VI) and Th(IV) tolerance, removal, bioaccumulation, and impacts on antioxidant enzymes of thermophilic B. cereus have been examined in detail. Changes in the surface macrostructure and functionality of B. cereus following interaction with U(VI) and Th(IV) were studied using a scanning electron microscope and fourier transform infrared spectroscopy. B. cereus was found to be highly resistant to 10 and 12.5 mg/L of U(VI) and Th(IV) after 24-h incubation. Superoxide dismutase (SOD) and catalase (CAT) activities were observed to be increased by different U(VI) and Th(IV) concentrations. The highest bioaccumulation capacity quantities were detected as 100.79 and 87.96 mg metal/g dried bacteria at 24th h at 12.5 mg/L concentration for U(VI) and Th(IV), respectively. The highest U(VI) and Th(IV) cell membrane bioaccumulation capabilities of B. cereus have been measured as 318.94 and 263.89 mg metal/g wet membrane, respectively, at 24 h and 12.5 mg/L. This study's findings suggested that B. cereus could be employed as a bioindicator organism for detecting metal contamination in natural or industrial water samples. However, further research should focus on other thermophilic microorganisms.
Biosorption of Cd, Cu, Ni, Mn and Zn from aqueous solutions by thermophilic bacteria, Geobacillus toebii sub.sp decanicus and Geobacillus thermoleovorans sub.sp stromboliensis: Equilibrium, kinetic and thermodynamic studies
(Elsevier Science Sa, 2009) Ozdemir, Sadin; Kilinc, Ersin; Poli, Annarita; Nicolaus, Barbara; Guven, Kemal
Biosorption of each of the ions Cd2+, Cu2+, Ni2+, Zn2+ and Mn2+ on Geobacillus toebii sub.sp. decanicus (G1) and Geobacillus thermoleovorans sub.sp. stromboliensis (G2) in a batch stirred system was investigated. The equilibrium adsorptive quantity was determined to be a function of the solution pH, contact time, biomass concentration, initial metal concentrations and temperature. The results obtained from biosorption experiments are used to understand the driving forces that govern the interaction between metal ions and a biosorbent. The experimental results were fitted well to the Scatchard plot, Langmuir, Freundlich, Dubinin-Radushkevich (D-R) isotherms. According to the parameters of the Langmuir isotherms, the maximum biosorption capacities of Cd2+, Cu2+, Ni2+, Zn2+ and Mn2+ for G2 were 38.8, 41.5, 42, 29 and 23.2 mg/g, respectively, while 29.2, 48.5, 21, 21.1 and 13.9 mg/g for G1, respectively. The mean free energy values evaluated from the D-R model indicated that the biosorptions of studied heavy metal ions onto bacteria were taken place by physical interaction. The biosorption mechanisms of studied metal ions on to the biosorbents were analysed by FT-IR spectra of G1 and G2 with and without metal ions. The first order and second order coefficients were obtained at 298, 308, 318 and 343 K. The experimental results were used to calculate the thermodynamic parameters. (C) 2009 Elsevier B.V. All rights reserved.
Biosorption of Heavy Metals (Cd2+, Cu2+, Co2+, and Mn2+) by Thermophilic Bacteria, Geobacillus thermantarcticus and Anoxybacillus amylolyticus: Equilibrium and Kinetic Studies
(Taylor & Francis Inc, 2013) Ozdemir, Sadin; Kilinc, Ersin; Poli, Annarita; Nicolaus, Barbara
Two strains of thermophilic bacteria, Geobacillus thermantarcticus and Anoxybacillus amylolyticus, were employed to investigate the biosorption of heavy metals including Cd2+, Cu2+, Co2+, and Mn2+ ions. The effects of different biosorption parameters such as pH (2.010.0), initial metal concentrations (10.0300.0mg L-1), amount of biomass (0.2510g L-1), temperature (3080 degrees C), and contact time (15120min) were investigated. Concentrations of metal ions were determined by using an inductively coupled plasma optical emission spectrometry (ICP-OES). Optimum pHs for Cd2+, Cu2+, Co2+, and Mn2+ biosorption by Geobacillus thermantarcticus were found to be 4.0, 4.0, 5.0, and 6.0, respectively. For Anoxybacillus amylolyticus, the optimum pHs for Cd2+, Cu2+, Co2+, and Mn2+ biosorption were found to be 5.0, 4.0, 5.0, and 6.0, respectively. The Cd2+, Cu2+, Co2+, and Mn2+ removals at 50mg L-1 in 60min by 50mg dried cells of Geobacillus thermantarcticus were 85.4%, 46.3%, 43.6%, and 65.1%, respectively, whereas 74.1%, 39.8%, 35.1%, and 36.6%, respectively, for Anoxybacillus amylolyticus. The optimum temperatures for heavy metal biosorption were near the optimum growth temperatures for both strains. Scatchard plot analysis was employed to obtain more compact information about the interaction between metal ions and biosorbents. The plot results were further studied to determine if they fit Langmuir and Freundlich models.
Cd, Cu, Ni, Mn and Zn resistance and bioaccumulation by thermophilic bacteria, Geobacillus toebii subsp decanicus and Geobacillus thermoleovorans subsp stromboliensis
(Springer, 2012) Ozdemir, Sadin; Kilinc, Ersin; Poli, Annarita; Nicolaus, Barbara; Guven, Kemal
Bioaccumulation and heavy metal resistance of Cd2+, Cu2+, Ni2+, Zn2+ and Mn2+ ions by thermophilic Geobacillus toebii subsp. decanicus and Geobacillus thermoleovorans subsp. stromboliensis were investigated. The metal resistance from the most resistant to the most sensitive was found as Mn > Ni > Cu > Zn > Cd for both Geobacillus thermoleovorans subsp. stromboliensis and Geobacillus toebii subsp. decanicus. It was determined that the highest metal bioaccumulation was performed by Geobacillus toebii subsp. decanicus for Zn (36,496 mu g/g dry weight cell), and the lowest metal bioaccumulation was performed by Geobacillus toebii subsp. decanicus for Ni (660.3 mu g/g dry weight cell). Moreover, the dead cells were found to biosorbe more metal in their membranes compared to the live cells. In the presence of 7.32 mg/l Cd concentration, the levels of Cd absorbed in live and dead cell membranes were found as 17.44 and 46.2 mg/g membrane, respectively.
Chemical Composition, Antimicrobial and Antioxidant Activities of Hyssop (Hyssopus officinalis L ) Essential Oil
(Univ Agr Sci & Veterinary Med Cluj-Napoca, 2010) Kizil, Suleyman; Hasimi, Nesrin; Tolan, Veysel; Kilinc, Ersin; Karatas, Hakan
The essential oil of hyssop is widely used in food pharmaceutical and cosmetic industries throughout the world Therefore, it is very important to know the chemical characteristics of the oil for economic use and enhanced performance of the end products This study was carried out to determine antimicrobial and antioxidant activities of the essential oil of Hyssopus officinalis (L) (Lamiaceae) collected from wild in the Southeast Anatolian Turkey Chemical compositions of hydrodistilled essential oils obtained from hyssop leaves were analyzed by gas chromatography mass spectrometry (GC MS) For antimicrobial activity disc diffusion tests were carried out on Escherichia coli line ATCC25922 Pseudomonas aeroginosa line ATCC27853 Staphylococcus aureus line 25923 Staphylococcus pyogenes line ATCC19615 and Candida albicans line ATCC10231 and the antioxidant activity was determined by using the diphenylpicrylhydrazyl (DPPH) radical scavenging method It was determined that hyssop essential oil contained isopinocamphone (5727%) () beta pinene (7 23%) () telpinen 4-ol (7 13%) pinocaivone (649%) carvacrol (3 02%) p cymene (2 81%) and myrtenal (2 32%) as major components As shown by treatments with 5 and 10 mu of oil which exhibited strong antimicrobial activity against S pyogenes S aureus C albicans and E colt but not against P aeruginosa The antioxidant activity of H officinalis essential oil was lower compared to butylated hydroxytoluene (BHT) and ascorbic acid These results demonstrated that hyssop essential oil has relatively low antioxidant activity and good antimicrobial activity against some test organisms
Chemical fractionation of nickel in asphaltite based bottom ash
(Taylor & Francis Ltd, 2013) Aydin, Isil; Aydin, Firat; Kilinc, Ersin; Duz, M. Zahir; Hamamci, Candan
Asphaltite, originating from petroleum, contains many kinds of mineral elements derived from its generation. These elements exist in different forms which may change throughout the asphaltite combustion process. Chemical fractionation of nickel (Ni) is necessary for risk assessment of asphaltite based bottom ash (ABBA). This study presents the concentration and fractionation of Ni in bottom ash of asphaltite (Sirnak, SE Anatolia, Turkey). Determination of total Ni in ash was performed in two stage microwave-acid digestion followed by inductively coupled plasma optical emission spectrometry (ICP-OES). Dry ashing is used for the almost complete elimination of organic materials prior to analyte determination. A seven-step sequential extraction process to fractionation of Ni from ABBA was investigated. Total Ni concentration in the ABBA was found to be 568.15 mg kg(-1). The most abundant form of Ni in the ABBA was Ni as sulfide (301.23 mg kg(-1)). Relative abundances of the remaining Ni fractions in ABBA follow the order: Reducible (83.23 mg kg(-1)) > Water soluble (77.94 mg kg(-1)) > Carbonate (35.67 mg kg(-1)) > Exchangeable (28.11 mg kg(-1)) > Oxidisable (25.19 mg kg(-1)) > Residual (16.78 mg kg(-1)). Assessment of chemical, mineralogical, morphological and leaching behaviour of ashes is important for their effective management.
Cloud Point Extraction As a Preconcentration Step for Flame Atomic Absorption Spectrometric Determination of Pb
(Atomic Spectroscopy Press Ltd, 2012) Kilinc, Ersin; Aydin, Firat; Duz, M. Zahir
Cloud point extraction was employed as a pre-concentration method for the determination Of trace amounts of lead (Pb) after formation of a complex with (4-(2-pyridyi-azo)-resorcinol) (PAR) and later analysis by flame atomic absorption spectrometry (FAAS) using polkoxyethylene-7.5 octylphenyl-ether (Triton, X-114) as surfactant. After phase separation, based on the cloud, point separation of the mixture; the surfactant-rich phase was diluted with 1.0 mol L-1 HNO in methanol. The parameters affectmg the separation of the phases and the detection process were optimized. Under the optimum experimental conditions [i.e., pH 9.0, 2.0(-4) L-1 of PAR, 0.1% (w/v) Triton X-114 1 the detection limits were 2.1 and 1.6 ng mL(-1) for 30.0 and 40.0 mL solutions, respectively. The sensitivity of FAAS was improved by 31.0- and 43.7-fold for 30.0 and 40.0 mL of initial volumes, respectively. The developed method Was applied to the determination of lead in water samples with satisfactory results. The method was validated by employing certified wastewater CWW-TM-D and spiked/fortified water. NWTM-15.
Comparison of Cd(II) preconcentrations by using magnetized Pleurotus erygnii and Coprinus micaceus and its determination in real samples
(Elsevier Science Bv, 2019) Ozdemir, Sadin; Yalcin, M. Serkan; Kilinc, Ersin; Soylak, Mustafa
The utilization of the magnetized Pleurotus erygnii and Coprinus micaceus with gamma-Fe2O3 nanoparticles as biosorbents for magnetic solid phase extraction (MSPE) of Cd(II) were investigated in details. The surface structures of magnetized P. erygnii and C. micaceus were investigated by the Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscope (SEM) and energy dispersive X-ray (EDX). The best process conditions were tested and determined as pH 5, 3 mL min(-1) flow rate, 100 mg of P. erygnii and C. micaceus on 75 mg of gamma-Fe2O3 nanoparticles, 5 mL of 1 mol L-1 HCl as eluent, and 400 mL of sample volume for both biosorbents. The limit of detections (LOD) were achieved as 0.054 ng mL(-1) and 0.040 ng(-1) for magnetized P. erygnii and C. micaceus, respectively. Preconcentration factors were determined as 80 for both magnetized biosorbents. The recommended methods were validated using certificated reference materials. Cd(II) in different real samples were determined by ICP-OES (inductively coupled plasma optical emission spectrometry) after preconcentration with developed methods.
Determination of Essential Oil Composition, Antimicrobial and Antioxidant Properties of Anise (Pimpinella anisum L.) and Cumin (Cuminum cyminum L.) Seeds
(Ankara Univ, Fac Agr, 2014) Hasimi, Nesrin; Tolan, Veysel; Kizil, Suleyman; Kilinc, Ersin
In this research, the essential oil components, antimicrobial and antioxidant properties of anise (Pimpinella anisum L.) and cumin (Cuminum cyminum L.) seed oils were investigated. The essential oil components determined by GC/MS instrument. The antimicrobial activity determined by disc diffusion method against the gram negative bacteria, namely Escherichia coli ATCC 25922, Pseudomonas aeruginosa ATCC 27853, the gram positive bacteria namely Staphylococcus aureus ATCC 25923, Streptococcus pyogenes ATCC19615 and Candida albicans ATCC10231 as the yeast. The antioxidant activities of essential oils were carried out by DPPH free radical scavenging activity method. It was determined that the main components of the anise essential oil were trans-anethole (52.94%) followed by iso-anethole (13.89%), caryophllene oxide (8.55%) and caryophyllene (29.4%); the main components of the cumin essential oil were beta-pinene (15.77%), alpha-terpinene (15:52%), 1-Phenyl-1-butanol (15:13%), cumic aldehyde (12.74%) respectively. Anise essential oil showed weak antimicrobial activity and cumin essential oil showed moderate antimicrobial activity against test microorganisms. Cumin essential oil showed strong antimicrobial activity against C. albicans with 22 +/- 0.9 mm inhibition zone diameter. P. aeruginosa showed resistance to both essential oils. The antioxidant activity of cumin essential oil (75.60%) was observed closer to ascorbic acid (78.75%), higher than BHA (50.45%) and BHT (23.54%). Although anise essential oil exhibited low activity, it has the similar activity with BHT. The scavenging activity of the samples decreasing order was ascorbic acid> cumin >BHA>BHT> anise.
The equilibrium and kinetics studies of flurbiprofen adsorption onto tetrabutylammonium montmorillonite (TBAM)
(Elsevier, 2009) Akcay, Guelten; Kilinc, Ersin; Akcay, Mehmet
In this study, the adsorption of flurbiprofen (FBP, is a non-steroidal anti-inflammatory drug) on tetrabutylammonium (TBA)-montmorillonite (TBAM) was studied. The adsorption kinetics was interpreted using pseudo-first-order kinetic model and pseudo-second-order kinetic model. The pseudo-second-order model provides the best correlation with the experimental data ofTBAM adsorption. The adsorption data could be fitted with Freundlich and Dubinin-Radushkevich equation to find the characteristic parameters of each model. The adsorption energy, E and adsorption capacity (q(m)) for organic compound adsorbing on organo montmorillonite were estimated using the Dubinin-Radushkevich (D-R) equation. From DR isotherm, it was also determined that the type of adsorption can be considered as physical adsorption mechanism. Thermodynamic parameters (Delta g(a)=-1.897 and -3.456 kJ/mol, Delta h(a)=-28.722 and -30.948 kJ/mol, Delta s(a)=-0.0964 and -0.0989 kJ/mol K for 298 and 313 K, respectively) were calculated by a new approximate from the adsorption isotherms of FBP on organo montmorillonite. The first order and second order coefficients (K-1ads = 2.50 and 14.30 mmol/g min, K-2ads = 0.0130 and 0.03120 g min/mu mol, respectively) were obtained at 298 and 313 K, respectively. (C) 2008 Elsevier B.V. All rights reserved.
Fe3O4@SiO2@Bacillus pumilis: magnetised solid phase bio-extractor for preconcentration of Pb(II) and Cu(II) from water samples
(Taylor & Francis Ltd, 2019) Erbas, Zeliha; Soylak, Mustafa; Ozdemir, Sadin; Kilinc, Ersin
In this study, preconcentration and separation of Cu(II) and Pb(II) ions by using Fe3O4@SiO2@Bacillus pumilis before their determinations by flame atomic absorption spectrometry (FAAS) were investigated. The thermophilic Bacillus pumilis were isolated from Meyremderesi spring, Sirnak, Turkey. Effects of important parameters such as pH, adsorbent amount, eluent type, concentration and volume of eluent and sample volume on magnetic solid phase extraction (MSPE) were examined in details. The preconcentration factors for Cu(II) and Pb(II) ions were calculated as 30 and 40, respectively. The accuracy of the proposed extraction procedure was validated analysing certificated reference materials and addition - recovery tests. The concentration of copper and lead were determined in water samples from Turkey by Flame AAS after application developed preconcentration-separation method.
Geobacillus thermoleovorans immobilized on Amberlite XAD-4 resin as a biosorbent for solid phase extraction of uranium (VI) prior to its spectrophotometric determination
(Springer Wien, 2012) Ozdemir, Sadin; Kilinc, Ersin
Geobacillus thermoleovorans subsp stromboliensis, was immobilized on an Amberlite XAD-4 ion exchanger and used as a solid phase extractant for the preconcentration of U(VI) ions prior to their determination by UV-VIS spectrophotometry. Parameters affecting the preconcentration (such as the pH value of the sample solution, the concentration of U(VI), the volume and type of eluent, the flow rate and the effect of potentially interfering ions) were studied. The optimum pH for the sorption of U(VI) was found to be pH 5.0. 5.0 mL of 1 M hydrochloric acid were used to eluate the U(VI) from the column. The loading capacity is 11 mg g(-1). The limits of detection and quantification are 2.7 and 9.0 mu g L-1, respectively, and relative standard deviations are < 10 %. The method was applied to the determination of U(VI) in a certified reference sample (NCS ZC-73014; tea leaves) and in natural water samples.
Geochemical Multi-element ICP-OES Analysis of Borehole Waters from SE Anatolia
(Atomic Spectroscopy Press Ltd, 2016) Duz, M. Zahir; Sagirdag, Mehmet; Celik, Kadir Serdar; Hasan, Mahmood A.; Kilinc, Ersin
Water supply from boreholes is today used by people from rural areas of Turkey more commonly due to the reduction of available surface water. For this reason, the concentrations of Al, As, B, Be, Ca, Cd, Co, Cr, Fe, Hg, K, Mg, Mn, Mo, Na, Ni, Pb, Se, Sn, and Zn in borehole waters of the Diyarbakir province (SE Anatolia) were determined in this study. Thirty borehole waters were sampled from different towns and villages. The samples were analyzed by inductively coupled plasma optical emission spectrometry (ICP-OES). The results of the analyses were compared with guidelines as set by Turkey, the WHO, and the EU. From the results it could be concluded that the ICP-OES method can be considered useful for the routine determination of trace elements in waters and similar matrices. For quality control purposes, the certified reference material TMDW-B Drinking Water was employed for validation. The recovery values were in the range of 93-101%. The Al, As, B, Be, Cd, Co, Cr, Hg, Mn, Mo, Ni, Pb, and Sn concentrations in the samples were found lower than the recommended LOD. The concentrations found were in the range of 12.71-111.4 mg/L for Na, 0.76-3.07 mg/L for K, 9.62-115.5 mg/L for Ca, 2.69-41.85 mg/L for Mg, 10 mu g/L.
ICP-OES Multi-element Analysis of Wheat Grown in Southeastern Turkey
(Atomic Spectroscopy Press Ltd, 2017) Duz, M. Zahir; Duzgun, Mehmet; Cam, Belgizar; Celik, K. Serdar; Kilinc, Ersin
The bread and durum wheat varieties grown in Southeastern Turkey are the main source of food consumed by the Turkish population and serve as bread and pasta. In this study, 12 kinds of durum wheat and 5 kinds of bread wheat samples registered by the International Agricultural Research and Training Centre of Turkey (IARTC, Turkey) were investigated for their multi-elemental concentrations (Ca, K, Mg, Fe, Zn, Mn, Si, Sn, Cu, Cr, Cd, Ni, V, Pb, As, and Se). The samples were microwave digested and the elements determined by ICP-OES. The results were in good agreement with the certified values. This study shows that the elements Si, Fe, Zn, Cd, Cr, Cu, Sn, and Pb in durum wheat were higher than in bread wheat. Both wheat species were found to be rich in terms of Ca, Mg, and K. The multi-element content of some bread wheat and durum wheat was also in good agreement with the maximum allowable levels of the Food and Agriculture Organization (FAO) World Health (WHO).
In situ atom trapping of Bi on W-coated slotted quartz tube flame atomic absorption spectrometry and interference studies
(Pergamon-Elsevier Science Ltd, 2013) Kilinc, Ersin; Bakirdere, Sezgin; Aydin, Firat; Ataman, O. Yavuz
Analytical performances of metal coated slotted quartz tube flame atomic absorption spectrometry (SQT-FAAS) and slotted quartz tube in situ atom trapping flame atomic absorption spectrometry (SQT-AT-FAAS) systems were evaluated for determination of Bi. Non-volatile elements such as Mo, Zr, W and Ta were tried as coating materials. It was observed that W-coated SQT gave the best sensitivity for the determination of Bi for SQT-FAAS and SQT-AT-FMS. The parameters for W-coated SQT-FAAS and W-coated SQT-AT-FAAS were optimized. Sensitivity of FAAS for Bi was improved as 4.0 fold by W-coated SQT-FAAS while 613 fold enhancement in sensitivity was achieved by W-coated SQT-AT-FAAS using 5.0 min trapping with respect to conventional FAAS. MIBK was selected as organic solvent for the re-atomization of Bi from the trapping surface. Limit of detection values for W-coated SQT-FAAS and W-coated SQT-AT-FAAS was obtained as 0.14 mu g mL(-1) and 0.51 ng mL(-1), respectively. Linear calibration plot was obtained in the range of 2.5-25.0 ng mL(-1) for W-coated SQT-AT-FAAS. Accuracy of the W-coated SQT-AT-FAAS system was checked by analyzing a standard reference material, NIST 1643e. (C) 2013 Elsevier B.V. All rights reserved.
In vitro biological activities and fatty acid profiles of Pistacia terebinthus fruits and Pistacia khinjuk seeds
(Taylor & Francis Ltd, 2015) Hacibekiroglu, Isil; Yilmaz, Pelin Koseoglu; Hasimi, Nesrin; Kilinc, Ersin; Tolan, Veysel; Kolak, Ufuk
This study reports in vitro anticholinesterase, antioxidant and antimicrobial effects of the n-hexane, dichloromethane, ethanol and ethanol-water extracts prepared from Pistacia terebinthus L. fruits and Pistacia khinjuk Stocks seeds as well as their total phenolic and flavonoid contents, and fatty acid compositions. Ethanol and ethanol-water extracts of both species exhibited higher anticholinesterase activity than galanthamine. Among ABTS, DPPH and CUPRAC assays, the highest antioxidant capacity of the extracts was found in the last one. P. terebinthus ethanol extract being rich in flavonoid content showed the best cupric reducing effect. All extracts possessed no antimicrobial activity. The main fatty acid in P. terebinthus fruits (52.52%) and P. khinjuk seeds (59.44%) was found to be oleic acid. Our results indicate that P. terebinthus fruits and P. khinjuk seeds could be a good source of anticholinesterase compounds, and could be phytochemically investigated.
A magnetized fungal solid-phase extractor for the preconcentrations of uranium(VI) and thorium(IV) before their quantitation by ICP-OES
(Springer Wien, 2019) Kilinc, Ersin; Ozdemir, Sadin; Yalcin, M. Serkan; Soylak, Mustafa
The fungus Bovista plumbea immobilized on -Fe2O3 nanoparticles is shown to be a novel sorbent for magnetic solid-phase extractions of U(VI) and Th(IV). The biosorbent was characterized by FT-IR, SEM, and EDX. The effects of pH value, flow rate and volumeof sample, amounts of biomass and support material, eluent type, foreign ions and repeated use of the sorbent on extraction efficiency were investigated. The sorption capacities are 41 and 44mgg(-1), respectively, for U(VI) and Th(IV). The results indicated that B. plumbea immobilized onto -Fe2O3 nanoparticles can be utilized as a novel material for the preconcentrations of U(VI) and Th(IV) in certified materials and in spiked tap, river and lake waters.

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