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    gamma-Fe2O3 magnetic nanoparticle functionalized with carboxylated multi walled carbon nanotube for magnetic solid phase extractions and determinations of Sudan dyes and Para Red in food samples
    (ELSEVIER SCI LTD, 2018) Kilinc, Ersin; Celik, Kadir Serdar; Bilgetekin, Havin
    Hybrid nanostructures composed of gamma-Fe2O3 (maghemite) and carboxylated-multi walled carbon nanotube (cMWCNT) were used for the magnetic solid phase extractions and determination of Sudan I, II, III, IV, Para Red, Sudan Black B and Sudan Red 7B in chili products. High performance liquid chromatography (HPLC) was employed for the measurements. Limit of quantification (LOQ) values were found in the range 0.44-2.82 ng mL(-1) for analytes. The best extraction parameters were determined as pH 8.0, 40 mg of magnetic nanoparticle, 4.0 min of contact time, 0.3 mL desorption by acetonitrile. The samples were dissolved in acetone-dichloromethane-methanol (3: 2: 1, v/v/v) and diluted with acetonitrile-methanol (v/v; 80: 20) before the method was applied. Concentrations of Sudan dyes and Para Red were determined in four samples of chili powder from less than LOQ to 31.21 +/- 1.6 ng g(-1), two samples of chili tomato sauces (lower than LOQ) and two samples of ketchup (lower than LOQ).
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    The Role of Trace Elements in the Malignant-Benign Differentation of Pleural Effusions
    (DERMAN MEDICAL PUBL, 2016) Demirpence, Ozlem; Yildirim, Mustafa; Avci, Alper; Kilic, Ersin; Bilgetekin, Havin; Deniz, Hulya Gupse; Kaya, Vildan; Cicek, Hulya
    Aim: It has been speculated that trace elements may play a role in some type of cancers. The aim of the present study was to examine the diagnostic utility of trace elements in pleural fluid with pleural effusions. Material and Method: This study consisted of 38 patients diagnosed with malignant and benign pleural effusions. Chrome, nickel, selenium, copper, lead and zinc concentrations in samples were determined by inductively coupled plasma optical emission spectrometry. Results: No significant difference was found between malignant and benign effusions with respect to Cr, Cu, Ni, Pb, Se and Zn concentrations in samples. Discussion: Trace elements have function as the component of many enzymes and the catalyst of some chemical reactions. There have been studies demonstrating the association of the deficiency or surplus of trace elements (TEs) with various type of cancers. In our study, the role of TEs measured in the pleural effusions in the differential diagnosis in the effusion etiology could not be demonstrated.