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    Determination of Trace Elements in Turkish Wines by ICP-OES and HG-ICP-OES
    (Atomic Spectroscopy Press Ltd, 2010) Aydin, Isil; Yuksel, Uyan; Guzel, Remziye; Ziyadanogullari, Berrin; Aydin, Firat
    The aim of this work was to determine the concentration of toxic metals in wine samples from different regions in Turkey using ICP-OES and HG-ICP-OES, and comparing the results with reports from other researchers. Ten samples each of white wines and red wines were obtained at a local supermarket and analyzed for Ca, K, Cr, Mn, Sn, Zn, Cu, Fe, Ni, Mg, Al, and Co by inductively coupled plasma optical emission spectrometry (ICP-OES), and for Hg, Pb, and Cd by hydride generation combined with inductively coupled plasma optical emission spectrometry (HG-ICP-OES). The concentrations found in red and white wines were, respectively: Cd: 0.017 and 0.016 mu g L-1; Ply 0.021 and 0.030 mu g L-1; Hg: <0.005 and <0.01 mu g L-1; Ca: 44.118 and 42.195 mg L-1, Cr: 0.056 and 0.0584 mg L--1,L- K: 1169 and 986 mg L--1,L- Mn: 1.564 and 0.118 mg L--1,L- Sn: 0.098 and 0.089 mg L--1,L- Zn: 0.665 and 0.473 mg L-1, Cu: 0.079 and 0.126 mg L-1, Fe: 1.024 and 1.005 mg L-1, Ni: 0.036 and 0.051 mg L-1, Mg: 78 and 68 mg L-1, Al: 0.524 and 0.524 mg L-1, Co: 0.214 and 0.134 mg L-1, The accuracy of the method was verified using the standard reference material NRCSLRS-4 River Water. The analytical values obtained are comparable with those reported by other researchers.
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    MINERAL CONTENT, ESSENTIAL OIL COMPONENTS AND BIOLOGICAL ACTIVITY OF TWO MENTHA SPECIES (M. piperita L., M. spicata L.)
    (Soc Field Crop Sci, 2010) Kizil, Suleyman; Hasimi, Nesrin; Tolan, Veysel; Kilinc, Ersin; Yuksel, Uyan
    The essential oil of mint species are widely used in food, pharmaceutical and cosmetic industries, growing 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 mineral content, essential oil composition, antimicrobial and antioxidant activities of essential oil of Mentha piperita (L.) and M. spicata (L.) (Lamiaceae). Chemical compositions of hydro-distilled essential oils obtained from mint species leaves were analyzed by gas chromatography-mass spectrometry (GC-MS). For antimicrobial activity, the disc diffusion tests were carried out on E. coli line ATCC25922, P. aeroginosa line ATCC27853. S. aureus line 25923 51 pyogenes line ATCC19615 and C. albicans line ATCC 9231, and the antioxidant activity was performed by using DPPH radical-scavenging method. It was determined that essential oil of M. piperita and M. spicata contains menthol and carvone as major components. respectively. Treatment of 5 mu l, 10 mu l 15 mu l and 20 mu l of the oil exhibited strong antimicrobial activity against S. pyogenes, S. aureus and C albicans and E. coli, except P. aeruginosa. The antioxidant activity of essential oil of mint species lowered DPPH activity compared to ascorbic acid. The results demonstrated that mint species essential oil has clearly good antimicrobial activity against test organisms and acceptable antioxidant activity.
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    Phallus impudicus loaded with ?-Fe2O3 as solid phase bioextractor for the preconcentrations of Zn(II) and Cr(III) from water and food samples
    (Elsevier Sci Ltd, 2020) Yalcin, M. Serkan; Kilinc, Ersin; Ozdemir, Sadin; Yuksel, Uyan; Soylak, Mustafa
    We investigated the application of fungus Phallus impudicus loaded gamma-Fe2O3 nanoparticles as a biosorbent for magnetic solid phase extractions of trace levels of Zn(II) and Cr(III) ions from natural samples before their measurements by inductively coupled plasma optical emission spectrometry. The characterization of magnetized P. impudicus was performed using the scanning electron microscope, the energy dispersive X-ray and Fourier transform infrared spectroscopy. Important experimental factors were investigated. The experimental results fitted well to the Langmuir adsorption model and pseudo-second order kinetic model. Limit of detections of targeted ions by magnetic solid phase extraction method based on use of P. impudicus were found as 10.5 ngL(-1) and 12.6 ngL(-1) respectively for Cr(III) and Zn(II). The sorption capacities of the biosorbent were 22.8 mgg(-1) for Cr(III) and 25.6 mgg(-1) for Zn(II). The preconcentration factors were achieved as 100 for both of ions. RSDs for inter- and intraday precisions were found as lower than 2.0% and 2.1% respectively for both of targeted ions. The accuracy of the recommended process was tested by recovery measurements on the certificated reference materials and successfully applied for quantification recoveries of Cr(III) and Zn(II) ions from water and food samples.
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    Preconcentration with Bacillus subtilis-Immobilized Amberlite XAD-16: Determination of Cu2+ and Ni2+ in River, Soil, and Vegetable Samples
    (Taylor & Francis Inc, 2015) Okumus, Veysi; Ozdemir, Sadin; Kilinc, Ersin; Dundar, Abdurrahman; Yuksel, Uyan; Baysal, Zubeyde
    Solid-phase extraction (SPE) method was developed for the preconcentration of Cu2+ and Ni2+ before their determination by inductively coupled plasma optical emission spectrometry (ICP-OES). Bacillus subtilis-immobilized Amberlite XAD-16 was used as biosorbent. Effects of critical parameters such as pH, flow rate of samples, amount of Amberlite XAD-16 and biosorbent, sample volume, eluent type, and volume and concentration of eluent on column preconcentration of Cu2+ and Ni2+ were optimized. Applicability of the method was validated through the analysis of the certified reference tea sample (NCS ZC73014). Sensitivity of ICP-OES was improved by 36.4-fold for Cu2+ and 38.0-fold for Ni2+ by SPE-ICP-OES method. Limit of quantitation (LOQ) was found to be 0.7 and 1.1ng/ml for Cu2+ and Ni2+, respectively. Concentrations of Cu2+ and Ni2+ were determined by ICP-OES after application of developed method. Relative standard deviations (RSDs) were lower than 4.9% for Cu2+ and 7.9% for Ni2+. The Tigris River that irrigates a large agricultural part of Southeast Turkey is polluted by domestic and industrial wastes. Concentrations of Cu2+ and Ni2+ were determined in water, soil, and some edible vegetables as a biomonitor for heavy metal pollution.
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    Selective preconcentration of Lanthanum(III) by Coriolus versicolor immobilised on Amberlite XAD-4 and its determination by ICP-OES
    (Taylor & Francis Ltd, 2014) Ozdemir, Sadin; Okumus, Veysi; Dundar, Abdurrahman; Celik, Kadir Serdar; Yuksel, Uyan; Kilinc, Ersin
    Coriolus versicolor, a wood fungus, was immobilised on Amberlite XAD-4 and used as solid-phase biosorbent for preconcentrations of rare earth elements. La(III), Th(IV), U(IV) and Ce(III) were subjected to solid-phase extraction procedure. We observed that La(III) was selectively preconcentrated, while other ions remained in solution at pH 6.0. 5.0mL of 1.0molL(-1) HCl was used to elaute La(III) from column. 250mg of C. versicolor loaded on 1000mg of XAD-4 was optimised as solid-phase matrix. Concentrations of ions in solutions were determined by inductively coupled plasma- optical emission spectrometry (ICP-OES). The calibration plot after preconcentration was linear in the range from 1.0 to 50.0ngmL(-1) for La(III). Limit of detection was found as 0.27ngmL(-1) for La(III) by SPE method. Relative standard deviation was found lower than 6.7% for 1.0ngmL(-1) of La(III) solution (n=10). The sensitivity of ICP-OES was improved by a factor of 46.8. The applicability of the method was validated through the analysis of certified reference samples of tea (NCS ZC-73014) and spinach (NCS ZC-73013).
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    TRACE ELEMENTS LEVELS AND THEIR RELATIONS WITH CLINICAL FINDINGS AND QOL IN FIBROMIYALGIA
    (Oxford Univ Press, 2011) Nas, Kemal; Demircan, Zeynep; Karakoc, Mehmet; Yuksel, Uyan; Cevik, Remzi
    [Abstract Not Available]