Feyzullah Tokay

Balıkesir University · Department of Chemistry

The removal of the target analytes, Cd(II), Co(II), Cr(III), Ni(II), Pb(II), and Zn(II) from contaminated waters was achieved using super porous polyethyleneimine (PEI) cryogels as adsorbent. The optimum values of the sample pH and contact time were determined as 4.0 and 90 min, respectively, for the removal of the analytes. The adsorption capaciti...

In this work, determination of some elements including Pb, Ni, Ba, Fe, Zn, Mg, Mn, Al, Cu, Mo, Ca, B, Cr, Cd, V and Co were carried out in some canned and frozen vegetable samples sold in Balıkesir, Türkiye. The study covered randomly chosen 13 canned and frozen samples such as green peas, okra, shell bean, sweet corn, green beans, garniture and to...

A novel single step fractionation of cow’s milk was achieved using ethyl ether, n-hexane and isopropyl alcohol (3:3:4) mixture via solubility difference and precipitation. Milks were separated into lipid, serum and protein fractions. The distribution of elements was determined by ICP OES and validated by the analysis of NIST-1549a. The applicabilit...

A method for separation and preconcentration of Cu(II), Ni(II), and Cd(II) using N-N′-bis(5-methoxsalicylidene)-2-hydroxy-1,3-propanediamine modified silica gel was improved for aqueous samples and pharmaceuticals. Determination of the analytes was achieved by inductively coupled plasma optic emission spectrometry. The experimental conditions inclu...

In this paper, a novel vortex assisted solid phase extraction procedure combined with inductively coupled plasma optic emission spectrometry was presented for determination of Mn, Cu, Ni, Cr, Cd and Pb directly in oily matrix. The suggested separation and preconcentration method was based on simultaneous sorption of the target analytes from real es...

In this study, a simple and efficient solid phase extraction procedure was developed for simultaneous separation and preconcentration of Ba, Cd, Co, Cu, Mn and Ni. The methodology was based on preconcentration of the target analytes on N,N’-bis(4-methoxysalicylidene)-1,3-propanediamine modified silica gel prior to inductively coupled plasma optic e...

In this study, a sequential Sr fractionation scheme was developed for wheat flour matrix. The lipid, water-soluble, and starch fractions were separated successfully. Total and fractionated Sr was determined by ICP-MS. The limits of detection and quantification of the technique were 4.4 and 17.7 μg L−1 , respectively. The distribution of Sr was vari...

In the present work, a new and simple Schiff base-assisted extraction strategy for Ni and Zn from an edible oil matrix with subsequent determination using a flame atomic absorption spectrometer was suggested. According to the green approach, laborious sample-pretreatment procedures were eliminated via complexation of the analytes with N,N0 -bis(4-m...

Background: Availability of minerals in foodstuff depends on their physicochemical form. This study was conducted to determine the concentration and partitioning of Fe, Cu, Zn, Mn, Mg, Ca, Cr, Ni, Mo, Al, Ba, Pb, Sn, V, Co and Cd in yogurt, ayran, kefir, ice-cream, cream, and pudding. Methods: Assessment of element partitioning was carried out by a...

Background: Milk is one of the important drinks for human and serves many nutrients including trace elements required for growth. In terms of prediction of element availability in food, fractionation analysis is helpful for understanding element partitioning. Objective: The current study was conducted to examine the effect of dietary olive pellets...

A new fluorescein modified silica gel was utilized for solid phase extraction for the simultaneous and selective preconcentration of Ba2 +, Cd2 +, Co2 +, Cu2 +, Mn2 +, Ni2 +, Pb2 +, and Sr² +prior to determination by inductively coupled plasma – optical emission spectrometry. The sorbent was characterized using X-ray diffraction and scanning electr...

A novel preconcentration method for Pb and Zn ions using a column packed with Schiff base modified silica gel is described. The method was based on the sorption of analytes on N,N’-bis(4-methoxysalicylidene)-1,3-propanediamine modified silica gel and elution with HNO3 prior to flame atomic absorption analysis. The parameters pH, flow rate, sample v...

N, N’-bis(4-methoxysalicylidene) ethylenediamine is proposed as analytical reagent for the direct determination of chromium in original matrix of liquid oils. The method is based on the complexation of N, N’-bis(4-methoxysalicylidene) ethylenediamine and chromium in n-hexane:acetone (1:4) medium and spectrophotometric determination at 355 nm agains...

Abstract In this paper, a new solid phase extraction procedure is described for Cu(II), Co(II), and Ni(II). Silica gel which was coated with N,N’-bis(4-methoxysalicylidene) ethylenediamine (MSE) is used as a sorbent. Three independent variables were optimized using central composite design (CCD) for sorption and elution of metal ions. The optimum v...

In the present work, a new extraction method for separation of nickel from edible oils and determination by FAAS is reported. This method is based on extraction of Ni(II) ions from the oil to aqueous phase with N,N’-bis(4-methoxysalicylidene) ethylenediamine (MSE) and determination by FAAS. Properties of the complex formed between MSE and Ni(II) we...

A simple solid-phase extraction method has been described for the separation of Fe(III) and Cu(II) from liquid vegetable oils using N,N′-bis(4-methoxy salicylidene) ethylenediamine impregnated silica gel and the determination of these ions. The experimental parameters that affect the separation/preconcentration of ions were investigated by batch an...

Edremit Bay is located on west coast of Turkey and region’s economy mainly relies on olive products. In this study, Zn(II) content of soil, olive fruit and olive leaf samples obtained from Burhaniye and Küçükkuyu in Edremit Bay were analyzed. Additionally, humic acid contents of soil samples were determined and compared with a commercial fertilizer...

In the present work, a novel and rapid extraction method for Fe(III) and Cu(II) from liquid edible oils is described. N,N′-Bis(4-methoxysalicylidene)-1,2-diamino ethane (MSE) was utilized for the extraction of metal ions and the determination was achieved by flame atomic absorption spectrometry (FAAS). In order to optimize the extraction conditions...

In this paper, a silica gel-based new sorbent was prepared with a Schiff base, called as N,N′-bis(4-methoxysalicylidene) ethylenediamine (MSE). The modified silica gel (Si-MSE) was used for simultaneous separation and preconcentration of Cd(II) and Pb(II) from aqueous solutions. Determination of analyte concentrations in eluates were achieved by fl...

Fractionation analyses are essential to investigate the effects of dietary constituents on bioavailability of elements. A sequential separation procedure has been applied for elemental fractionation patterns in infant formula, coffee cream, milk powder, whey powder and rice flour. The protein, lipid and serum frac-tions were separated successfully,...

Fractionation of elements in food is essential for understanding and prediction of its bioavailability, effects and toxicity. In the present study, an analytical fractionation scheme for milk samples was developed for the common elements, such as Fe, Cu, Zn, Mn, Mg, Ca, Cr, Ni, Mo, Al, Pb, Sn, V, Ba, Co and Cd. For this purpose, applying a sequenti...

Trace metals can cause deterioration of the quality of the oil because of their catalyzing effect on oxidation reactions. So, the determinations of various elements in oils are important. In our study, a novel method for the determination of Zn(II) in liquid edible oils without digestion was developed. For this purpose, N,N’-bis(4 methoxysalicyli...