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Yayınlar
- MakaleYalnız künye2019Scopus SJRQ2A comprehensive study about Hibiscus sabdariffa leaves: antioxidant activity, polyphenol profile and macro- and micro-element content
Karaaslan, Nagihan M.
Hibiscus sabdariffa leaves are generally consumed by people in cold drinks and herbal tea. The purpose of this study is to examine in terms of antioxidant activity, polyphenol profile and macro- and micro-element content of H. sabdariffa leaves. Firstly, antioxidant activity studies were carried out by applying antioxidant activity assays to different extracts of the plant leaves. It has been observed that the antioxidant activity results vary depending on the extraction solvent and that the result obtained for one extract in some tests could not be obtained for the same extract in the other tests when solvents are changed. Secondly, the polyphenol profile of this plant was identified with a high-performance liquid chromatography–diode array detector (HPLC–DAD). For this purpose, thirteen polyphenols were examined in leaves of this plant, but only caffeic acid, chlorogenic acid, ellagic acid, p-coumaric acid and quercetin were detected among the studied polyphenols. Finally, macro-element including calcium (Ca), potassium (K), magnesium (Mg), sodium (Na) and micro-element including copper (Cu), iron (Fe), zinc (Zn) analysis was carried out using flame atomic absorption spectrometry (FAAS).
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İncele - MakaleYalnız künye2019Scopus SJRQ3Determination of antioxidant capacity using different acidified solvents and element contents of Allium tuncelianum: A regional and varietal study on endemic edible garlic
Karaaslan, Nagihan M.; Ince, Muharrem; Kaplan Ince, Olcay; Goksin Karaaslan, Merve
Allium tuncelianum (Tunceli garlic), an endemic and threatened plant species in the Tunceli province of Eastern Turkey, is an important native source for local people. The antioxidant activities of the acidified extracts of water, acetonitrile, methanol, and ethanol of Allium tuncelianum were investigated using five antioxidant capacity tests. The results indicated that methanol extract efficiencies of garlic samples using the ABTS, CUPRAC, and reducing power capacities were higher than the other extracts. Water extract and acetonitrile extract values were highest for total phenolic content and metal chelating activities, respectively. Moreover, the element contents such as calcium (Ca), copper (Cu), iron (Fe), potassium (K), magnesium (Mg), manganese (Mn), sodium (Na), and zinc (Zn) of Allium tuncelianum samples digested by microwave and ashing ovens were determined by flame atomic absorption spectrophotometry and the results were compared statistically. The Ca, Cu, K, Mg, and Zn concentrations using the microwave method were found to be higher than the ashing procedure. However, the Fe, Mn, and Na concentrations using the ashing method were found to be higher than those using the the microwave protocol.
AtıfScopus7WoS6OpenAlex7İncele - MakaleYalnız künye2018Scopus SJRQ3SEASONALLY VARIATIONS OF ARSENIC SPECIES IN CHICKEN MEATS CONSUMED BY TURKISH PEOPLE WITH HG-AAS
Kaya, Gokce; Karaaslan, Nagihan M.; Yaman, Mehmet
The aim in this study is speciation and determination of arsenic in chicken meat matrix. For this purpose, chicken meat samples consumed commonly by Turkish people belonging to five different companies in Turkey were obtained from markets once per 15 days during 14 months. The samples were digested in microwave oven by using both nitric and hydrochloric acid. It was found that microwave digestion method can be used successfully in the speciation analysis of arsenic. The determination and speciation of As in solutions were carried out by hydride generation-atomic absorption spectrophotometry (HG-AAS). From the observed results, concentrations of As (V) were ranged between 3.0-14.0 ng g(-1) (mean 7.3 ng g(-1)) for breast tissues and 3.0-9.0 ng g(-1) (mean 5.1 ng g(-1)) for leg tissues. The concentrations of As (III) in all studied chicken tissues were found lower than the limit of detection (2 ng g(-1)).
AtıfWoS2İncele - MakaleAçık Erişim2018Scopus SJRQ2Anthocyanin profile of strawberry fruit as affected by extraction conditions
Karaaslan, Nagihan M.; Yaman, Mehmet
The purpose of the study was to investigate the effect of extraction conditions to determine anthocyanin compounds in strawberry fruit. Anthocyanin profile of this fruit were determined via high-performance liquid chromatography-electrospray ionization-mass spectrometry. Flow rate of mobile phase, fragmentor potential, injection volume, and column temperature were applied to be optimum values as 0.5 mL min−1, 110 V, 5 µL, and 30°C, respectively. The extraction process was the important step in the isolation and identification of anthocyanins. For this purpose, anthocyanin contents in strawberry fruit were examined in terms of solvent type, extraction time, and liquid:solid ratio (v:w). The best extraction conditions in this fruit were found to be methanol as solvent, 30 min as extraction time and 1:1 as liquid:solid ratio (v:w). The results showed that the anthocyanin contents of strawberry fruit change by altering extraction conditions.
AtıfScopus50WoS39OpenAlex48İncele - MakaleYalnız künye2018Scopus SJRQ3Assessment and ICP-MS determination of toxic metal content (Cd, Cr, Ni, and Pb) in Ibrkish chicken meat for use as bioindicator for human health
Karaaslan, Nagihan M.; Yaman, Mehmet
The aim of this study was to determine the toxic metal concentrations in chicken meat consumed by the Turkish population and to establish health risk assessment. The concentrations of cadmium (Cd), chromium (Cr), nickel (Ni), and lead (Pb) in chicken meat produced by seven different suppliers were determined using inductively coupled plasma mass spectrometry (ICP- MS). The Cd concentrations in all samples were found to be lower than the maximum allowable concentration (MAC) of 50 Hg kg-1. The Cr and Ni concentrations in all samples were lower than 700 and 450 μg kg-1, respectively, with the exception of Cr in the samples from one producer and of Ni from two other producers. The Pb concentrations (max. 413 μg kg-1) in the samples from three producers were found to be higher than the MAC of 100 μg kg-1. Although the concentrations of lead in some samples exceed the limits set by the authorities, risk of developing cancer over a human lifetime was found to be not significant (between 3 to 16 per 1,000,000 persons).
AtıfScopus8İncele - MakaleAçık Erişim2018Investigation of mineral components and antioxidant properties of a healthy red fruit: Cornelian Cherry (Cornus mas L.)
Karaaslan, Merve Goksin; Karaaslan, Nagihan M.; Ates, Burhan
The mineral components of the foodstuff consumed by an individual are important in the growth and development of a human being. In recent years red fruits, because of their potential beneficial health effects, are getting attention of both consumers and manufacturers. One of the red fruits, Cornelian cherry (Cornus mas L.), was investigated in terms of both mineral components and antioxidant properties. The mineral components include calcium (Ca), iron (Fe), potassium (K), magnesium (Mg), and zinc (Zn) in this fruit were determined using flame atomic absorption spectrometry (FAAS). The antioxidant activity tests were applied to the extracts obtained using different solvents to examine the antioxidant properties of this fruit. Statistical analysis indicated that while the best results were obtained from acetone extracts, the lowest results were obtained from water extracts for all antioxidant activity tests (p<0.05). The best average values for DPPH and ABTS radical scavenging capacity, reducing power, total phenolic content and total flavonoid content in acetone extracts were found to be 1053.72±38.12 mg TEAC/100 g FW and 2907.34±152.05 mg TEAC/100 g FW, 5894.99±251.05 mg TEAC/100 g FW, 2979.25±69.40 mg GAE/100 g FW and 255.75±14.92 mg QE/100 g FW, respectively.
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İncele - MakaleYalnız künye2017Scopus SJRQ3Determination of element concentrations in commercial infant formulas using atomic absorption spectrometry
Unuvar, Songul; Savan, Ebru Kuyumcu; Karaaslan, Nagihan M.
The presence of heavy metals, inadequate minerals and elements in infant foods is of great concern. In this study, the heavy metals aluminum (Al) and lead (Pb), essential elements such as iron (Fe) and zinc (Zn), and minerals such as calcium (Ca), potassium (K), magnesium (Mg), and sodium (Na) were determined by atomic absorption spectrometry (AAS) in five different brands of 20 infant formula samples obtained from pharmacies and supermarkets in Malatya, Turkey. The Joint FAO/ WHO Expert Committee on Food Additives (JECFA) has set the maximum concentration levels of heavy metals in infant formula and levels of provisional tolerable weekly intake (PTWI) of these metals by infants. The levels of Al and Pb in the analyzed samples were found to be under legal limits. The recommended daily intake (RDI) of the essential elements and minerals were found within normal and permissible ranges, showing that the formulas are safe for infants.
AtıfScopus1İncele - MakaleYalnız künye2016Scopus SJRQ3Optimization of Cadmium Removal from Water by Hydroxyapatite Using Experimental Design Methodology
Ince, Olcay Kaplan; Ince, Muharrem; Karaaslan, Nagihan M.; Yonten, Vahap
The presence of cadmium in water is a serious threat to the environment. The removal of cadmium using hydroxyapatite as an adsorbent was studied in an aqueous system. Hydroxyapatite was prepared to process the adsorption of cadmium from aqueous solution. Experimental design methodology and response surface methodology (RSM) with a quadratic model associated with central composite design was used to optimize the pH, initial heavy metal concentration, final volume, and adsorbent dosage for the removal of cadmium. Analysis of variance identified significant factors on each parameter. RSM indicated that a pH of 8.5, a sample volume of 166 mL, an adsorbent of dosage 0.57 g, and a contact time of 82 min were optimal for the adsorption of Cd(II). Under these conditions, the removal of Cd(II) was 895 mg g(-1).
AtıfWoS17OpenAlex15İncele - MakaleAçık Erişim2016Scopus SJRQ2Nickel, Lead, and Cadmium Removal Using a Low-Cost Adsorbent - Banana Peel
Ince, Muharrem; Ince, Olcay Kaplan; Yonten, Vahap; Karaaslan, Nagihan M.
Water pollution because of inorganic contaminants is a serious problem due to the acute toxicities and carcinogenic nature of pollutants. Recently, much attention has been focused on using natural and low-cost adsorbents, especially food residues, for removing toxic metal ions. Batch removal of nickel (Ni(II)), lead (Pb(II)), and cadmium (Cd(II)) from aqueous solution using a natural adsorbent is described in this study. Effects of various parameters on adsorption capacities such as pH, adsorbent dose, and stirring time were investigated by batch experiments. The maximum adsorption capacities for Ni(II), Pb(II), and Cd(II) ions were 1.6 mg g(-1), 125 mg g(-1), and 84 mg g(-1), respectively. Characterization of the surface modification was performed with FTIR measurements. FTIR spectra showed that chemisorption takes place at the surface of the adsorbent. The Freundlich and Langmuir adsorption isotherms were used to evaluate the equilibrium data. The characteristic parameters for each isotherm were determined. The Langmuir and Freundlich isotherm provided the best correlation for Ni(II), Cd(II), and Pb(II) using banana peel.
AtıfWoS10OpenAlex13İncele - MakaleÖn baskısı açık2016Scopus SJRQ1Determination of anthocyanins in cherry and cranberry by high-performance liquid chromatography-electrospray ionization-mass spectrometry
Karaaslan, Nagihan M.; Yaman, Mehmet
Anthocyanins are a group of widespread natural phenolic compounds in vegetables and fruits. The anthocyanins have a wide range of applications due to the antioxidant, anticancer and anti-inflammatory properties. In this study, anthocyanins (delphinidin-3-o-glucoside, cyanidin-3-o-glucoside, pelargonidin-3-o-glucoside and malvidin-3-o-glucoside) in cherry and cranberry were determined using high-performance liquid chromatography-electrospray ionization-mass spectrometry (HPLC-ESI-MS). The anthocyanins were separated using gradient elution and a reserved-phase analytical column before identification by high-performance liquid chromatography-electrospray ionization-mass spectrometry. A high-performance liquid chromatography-electrospray ionization-mass spectrometry method was optimized for the determination of anthocyanins in cherry and cranberry. Furthermore, in this study, we investigated extraction conditions of fruit samples as well as determination of optimum HPLC-ESI-MS conditions. This study is novel in terms of simultaneously examining both optimization of HPLC parameters and extraction conditions. Obtained optimum conditions were used for the determination as the quantitative and qualitative analysis of anthocyanins in cherry and cranberry. The content of anthocyanins on the basis of wet weight in cherry and cranberry samples was determined for delphinidin-3-o-glucoside < d.l. (detection limit) and < d.l., for cyanidin-3-o-glucoside varied from 3.5 +/- A 0.4 to 8.3 +/- A 1.1 mg kg(-1) (average 5.8 +/- A 0.8 mg kg(-1)) and 9.8 +/- A 1.4 to 18 +/- A 3.0 mg kg(-1) (average 13.2 +/- A 1.8 mg kg(-1)), for pelargonidin-3-o-glucoside < d.l. and varied from 136 +/- A 19 to 233 +/- A 35 mg kg(-1) (average 185.3 +/- A 28 mg kg(-1)), for malvidin-3-o-glucoside < d.l. and < d.l., respectively.
AtıfWoS25OpenAlex29İncele - MakaleAçık Erişim2013Scopus SJRQ1Fractionation of Ni, Cr and Cu from Soil by Sequential Extraction Procedure and Determination by Inductively Coupled Plasma Optical Emission Spectrometry
Akkus, Sukran; Bal, Tulin; Karaaslan, Nagihan M.; Yaman, Emre; Kilinc, Ersin; Yaman, Mehmet
Five-step sequential extractions were employed to fractionation of Ni, Cr and Cu in soil polluted by anthropogenic activities and determine the mobility of the metals. Twelve samples were collected on an agricultural area that was located near an airport and intercity roads in Elazig-Turkey. Exchangeable, organically bounded, carbonate bounded, adsorbed species on Fe and Mn oxides and residual species (except silicates) of Ni, Cr and Cu were extracted into solution by using CaCl2, Na4P2O7, Na(2)EDTA, NH2OH-HCl and HNO3-H2O2, respectively. Mobile metal concentrations in fractions and total recoverable in soils were determined by using inductively coupled plasma-optical emission spectrometry (ICP-OES). Total recoverable Ni, Cr and Cu concentrations were in the range of 40-119, 45-126 and 23-72mgkg(-1), respectively. It was observed that total concentrations of metals in some of the samples were higher than the permitted values. The sum of the mobile percentages of metals was found to be lower than 50%. The Ni, Cr and Cu percentages for exchangeable species are in the ranges of 0.18-1.64, 0.03-0.59 and 0.42-2.53%, respectively.
AtıfWoS6OpenAlex5İncele - MakaleAçık Erişim2011Scopus SJRQ4Determination of Elements in Thermal Springs for Monitoring Pre-Earthquake Activites by ICP-MS
Yaman, Mehmet; Sasmaz, Ahmet; Kaya, Gokce; Ince, Muharrem; Karaaslan, Nagihan M.; Ozcan, Cemile; Akkus, Sukran
AtıfOpenAlex3İncele - MakaleYalnız künye2009Scopus SJRQ3Synthesis of New Polymeric Resin and Its Application in Solid Phase Extraction of Copper in Water Samples Using STAT-FAAS
Timur, Irfan; Senkal, B. Filiz; Kaplan, Olcay; Kaya, Gokce; Ozcan, Cemile; Karaaslan, Nagihan M.; Yaman, Mehmet