Yazar "Aydin, Firat" seçeneğine göre listele

Listeleniyor 1 - 20 / 44
  • [ X ]
    Öğe
    Aflatoxin species: their health effects and determination methods in different foodstuffs
    (Sciendo, 2012) Bakirdere, Sezgin; Bora, Selin; Bakirdere, E. Gulhan; Aydin, Firat; Arslan, Yasin; Komesli, O. Tarik; Aydin, Isil
    Carcinogenic and mutagenic properties of aflatoxin species are known in literature. Their intake over a long time period might be health-dangerous for human even at trace levels. It is well known that different foodstuffs can be contaminated by aflatoxin species through growing and storage. Due to the serious health effects, sensitive determination of aflatoxin species in any matrices related with the human being is very crucial at trace levels. In literature, there are sensitive techniques to analyze the different samples for the contents of their aflatoxin species. Each technique has some advantages and disadvantages over the other techniques. This review aims to summarize the different health effects of aflatoxin species, development of analytical techniques and applications of developed techniques in a variety of matrices.
  • [ X ]
    Öğe
    Application of Modified BCR Sequential Extraction Method for the Fractionation and ICP-OES Determination of Copper in Asphaltite Combustion Waste
    (Atomic Spectroscopy Press Ltd, 2013) Aydin, Firat; Gunduz, Beniz; Aydin, Isil; Akba, Osman; Saydut, Abdurrahman; Hamamci, Candan
    Asphaltite is derived from petroleum-origin solid fossil fuel. It contains many elements in different forms which may change during the combustion process. This study presents a modified BCR sequential extraction method for the fractionation of copper (Cu) in asphaltite combustion waste (ACW) into four forms (exchangeable, reducible, oxidizable, and residual) and determination by inductively coupled plasma optical emission spectrometry (ICP-OES). The 327.393 nm line was used because it offers highest detectability and is free from major spectral interferences. A two-stage microwave acid digestion program was used for preparation of the samples. The total Cu concentration in the ACW was 104.56 mg kg(-1) dry weight (d.w). The most abundant copper fraction in the studied ACW samples was found as residual fraction of Cu (59.94 mg kg(-1) d.w.). The relative abundances of the remaining Cu fractions in ACW were as follows: exchangeable + water- and acid-soluble (19.07 mg kg(-1) d.w.) > oxidizable (17.49 mg kg(-1)' d.w.) > reducible (7.65 mg kg(-1) d.w.). The results were found to be in good agreement with the certified values. The advantages of the technique include a high degree of automation, good reproducibility, and short analysis time, which makes it the method of choice for the fractionation of Cu.
  • [ X ]
    Öğe
    Chemical Characteristics of Settled Particles during a Dust-Storm
    (Hard, 2012) Aydin, Firat; Aydin, Isil; Erdogan, Sait; Akba, Osman; Isik, Birgul; Hamamci, Candan
    Major synoptic systems bring desert dust from Arabia and the Sahara to Anatolia, Turkey. A study of particulate matter (PM) associated metal content such as As, Al, Cr, Cd, Co, Cu, Fe, Mn, Mo, Ni, Pb, Sb, Se, Sn, and Zn, etc., has been carried out for Diyarbakir, SE Anatolia, Turkey. Results show that the PM10 levels during a dust storm were much higher than in a non-dust-storm period and that four metals (Fe, Al, Cr, Mn) were dominant in settled particles. This research does not only provide background data for air quality management, but also provides valuable information about the chemical composition of the particles.
  • [ X ]
    Öğe
    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.
  • [ X ]
    Öğe
    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.
  • [ X ]
    Öğe
    Comparative Determination of Phosphorus Fractions in Coastal Surface Sediment (NE Mediterranean Sea) by ICP-OES and UV/VIS Spectrometry
    (Atomic Spectroscopy Press Ltd, 2018) Aydin, Isil; Temel, Zihni; Gunduz, Beniz; Aydin, Firat
    The role of phosphorus (P) in sediments in promoting marine eutrophication can be more efficiently evaluated by considering different P fractions instead of total P content. This paper presents the P distribution (total P, organic P, and fractions of inorganic P; loosely adsorbed P, and P bound to aluminium, P bound to calcium, and P bound to iron, as well as total inorganic P) in surface sediments collected in June 2015 at the NE Mediterranean Sea (due to extensive tourism is under anthropogenic pressure) using chemical (sequential extraction) fractionation techniques. A number of fractions were collected for each reagent for subsequent colorimetric determination using UV/Vis spectrometry and ICP-OES determination. The two methods show similar results for the P and the concentrations are in good agreement with the reference values. The results presented P-bound calcium as the major P fraction in the surface sediments collected, mainly due to the oversaturation of calcite and the co-precipitation of phosphate. Relative abundances of the remaining P fractions follow the order: Fe-P > Al-P > loosely bound P for coastal surface sediment.
  • [ X ]
    Öğe
    Comparison of the biodiesel quality produced from refined sunflower (Helianthus annuus L) oil and waste cooking oil
    (Multi-Science Publ Co Ltd, 2010) Saydut, Abdurrahman; Kafadar, Aylin Beycar; Tonbul, Yalcin; Kaya, Canan; Aydin, Firat; Hamamci, Candan
    A major hurdle in commercialization of biodiesel from vegetable oil, in comparison to petroleum-based diesel fuel, is its cost of manufacturing, primarily the raw material cost. Waste cooking oil is one of the economical sources for biodiesel production. NaOH and KOH catalyzed processes for prepared of biodiesel expressed of fatty acid methyl ester were comparatively studied for refined sunflower (Helianthus annuus L) oil and waste cooking oil. Transesterification was carried out using 100% excess methanol; i.e. molar ratio of methanol to oil is 6:1 and catalyst concentration of 0.5% at 60 degrees C. Fuel properties and specifications such as viscosity, flash point, cloud point, pour point, density, cetane number, and acidic value are determined and compared to each other and petroleum diesel. This study characterizes the fuel properties of biodiesel produced from refined sunflower oil and waste cooking oil using two different catalysts (NaOH and KOH) to provide a comprehensive understanding of biodiesels.
  • [ X ]
    Öğe
    Content and Mobility Behavior of Iron and Manganese in Asphaltite Burning Residue Using ICP-OES
    (Atomic Spectroscopy Press Ltd, 2014) Aydin, Isil; Gunduz, Beniz; Aydin, Firat; Akba, Osman; Saydut, Abdurrahman; Hamamci, Candan
    The determination of inorganic pollutants leaching from solid waste, such as coal, asphaltite, oil shale, and ash, is an important topic for industrial applications and solid waste management. This study presents the concentration and fractionation of iron (Fe) and manganese (Mn) in asphaltite burning residue (ABR) and their determination by inductively coupled plasma optical emission spectrometry (ICP-OES). A modified Tessier sequential extraction method was used for the fractionation of Fe and Mn in four forms (exchangeable, carbonates, bound to organic and sulfide, and residual content). Investigations on the Fe and Mn chemical fractions and their environmental mobility in ash solution systems were carried out. It was found that Mn in ABR (from Harbul-Silopi, Turkey) occurs in the following fractions: exchangeable (13.56%), associated with carbonates (28.94%), associated with organic matter and sulfides (17.48%), and residual content (40.08%). Fe occurs in the following fractions: exchangeable (11.11%), carbonates (27.68%), organic matter and sulfides (23.39%), and residual content (37.82%). Among these fractions, the exchangeable and carbonate-bound fractions are unstable and prone to leach out, while the organic matter-bound fractions and the residual fractions are considered to be relatively stable and of low bioavailability. Thw mobility fractions of Fe contain 38.79% and of Mn contain 42.50% of their total concentration in ABR under normal environmental conditions.
  • [ X ]
    Öğe
    Determination of Antimony in Gunshot Residues Using GFAAS and SEM/EDX
    (Atomic Spectroscopy Press Ltd, 2013) Aksoy, Cagdas; Akman, Yusuf; Ergun, Zeynep Omca; Uzek, Ugur; Aydin, Firat
    Transferring gunshot residue via adhesive tape is a very applicable technique for the collection of firearm discharge residue from the surface of hands and face. In this study, antimony was determined in 15 types of adhesive tape and the false positive possibility in the results was investigated. Adhesive tapes, which were provided by crime scene investigators and from a regional market, were analyzed with a graphite furnace atomic absorption spectrometer as used in Police Criminal Laboratories. In two samples, the measured antimony concentrations were 9.2 and 43.7 lig L-1, respectively, and high enough to cause false positives although most of the samples were clean. The source of antimony was detected via imaging and detailed elemental analysis of the samples. In addition, a simple method is proposed to prevent false positives. The method described is simpler, less costly, and faster than the modem approaches used for gunshot residue analysis and is based on the determination of antimony using GFAAS and SEM/EDX.
  • [ X ]
    Öğe
    Determination of indium using vortex assisted solid phase microextraction based on oleic acid coated magnetic nanoparticles combined with slotted quartz tube-flame atomic absorption spectrometry
    (Elsevier Science Bv, 2018) Celik, Birgul; Akkaya, Erhan; Bakirdere, Sezgin; Aydin, Firat
    A solid phase microextraction (SPME) method combined with slotted quartz tube-flame atomic absorption spectrometry (SQT-FAAS) was developed and optimized for the extraction and the determination of trace indium in different matrices. The method relies upon SPME that uses oleic acid coated magnetite nanoparticles (MNPs) followed by analysis with SQT mounted FAAS. After the enhancement in sensitivity by means of SPME, further improvement in sensitivity was provided by SQT which improves the detection power of conventional FAAS. The easy separation of extracted indium from the media was facilitated using an external magnetic field. Some effective parameters on the development of the method such as pH of the analyte solution, amount of eluent, amount of MNPs were optimized to obtain maximum absorbance value at each optimization step in order to achieve an improved detection power. Under the optimum experimental and instrumental conditions, the enhancement factor of 44 was obtained where the limit of detection and the limit of quantification were found to be 6.02 mu g/L and 20.06 mu g/L, respectively. Recovery tests were also studied in order to demonstrate the accuracy of the developed analytical method and satisfactory outcomes were obtained.
  • [ X ]
    Öğe
    Determination of lead separated selectively with ion exchange method from solution onto BCW in Sirnak, East Anatolia of Turkey
    (Elsevier Science Bv, 2011) Aydin, Firat; Yasar, Fatma; Aydin, Isil; Guzel, Fuat
    There are approximately 82 million of tons asphaltites reserves in Sirnak, East Anatolia of Turkey. The present study was investigated to employ ashes of Sirnak BCW (burned coal waste) as an ion exchange in removal of important toxic metal, Lead (Pb), in high yields by adsorption. The ion exchange characteristics of lead onto BCW from aqueous solution were investigated with respect to the changes in pH of solution, adsorbent dosage, initial metal ion concentration, contact time and temperature of solution. For the adsorption of lead, the Langmuir isotherm model fitted to equilibrium data better than the Freundlich isotherm model. Thermodynamic functions, the change of free energy (Delta G degrees), enthalpy (Delta N degrees) and entropy (Delta S degrees) of adsorption were also calculated for lead. These parameters showed that the adsorption was feasible, spontaneous and exothermic at 293-333 K. Experimental data were also evaluated in terms of kinetic characteristics of adsorption. The batch kinetic data were correlated to the pseudo-first order and pseudo-second order models. The data fitted better to the pseudo-second order equation. The activation energy of systems was determined. Experimental data have shown that BCW that was used in unmodified form; as low cost, readily available ion exchange; can be used for removal of lead from industrial waste waters. Analysis was determined using Flame Atomic Absorption Spectrometry (FAAS). (C) 2011 Published by Elsevier B.V.
  • [ X ]
    Öğe
    Determination of mineral phosphate species in sedimentary phosphate rock in Mardin, SE Anatolia, Turkey by sequential extraction
    (Elsevier Science Bv, 2009) Aydin, Isil; Imamoglu, Sefik; Aydin, Firat; Saydut, Abdurrahman; Hamamci, Candan
    The importance of the effect of phosphate rock depends on the chemical form of phosphorus in which this element is combined. The paper presents the results of inorganic and organic forms of phosphorus in the phosphate rock from Mazidag-Derik, Semikan deposit located at Mardin city at SE Anatolia of Turkey. Total phosphorus concentration in the rock is an average 18.5%. The inorganic phosphorus mean % contents were 99.98% for studied sedimentary phosphate rock. Speciation of inorganic phosphorus was carried out using a method based on sequential extractions of the sedimentary phosphate rock each releasing four forms of inorganic phosphorus: loosely sorbed phosphorus, phosphorus bound to aluminium (P-Al), phosphorus bound to calcium (P-Ca) and phosphorus bound to iron (P-Fe). Calcium bound phosphorus is the dominant form of inorganic phosphorus in the studied sedimentary phosphate rock. Aluminium bound phosphorus is the second, iron bound phosphorus is the third most prevailing form. Loosely bound phosphorus is present in the lowest amounts. Analyses of phosphorus forms in sedimentary phosphate rock using a UV spectrophotometric method and ICP-AES are reported here. For the phosphorus the two methods give the same results and the concentrations are in good agreement with the reference values. (C) 2008 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    The determination of qualities in different whole-plant silages among hybrid maize cultivars
    (Academic Journals, 2011) Demirel, Ramazan; Akdemir, Fatih; Saruhan, Veysel; Demirel, Dilek Senturk; Akinci, Cuma; Aydin, Firat
    This study was conducted in order to determine the effects of 12 maize hybrids (Goldeclat, Falkner, Maverik, Tivak 6661, Tivak 678, Bora, Consur, DK 626, Ada 9510, Pioneer 3167, TTM 815, and LG 55) on the nutrient composition (that is, dry matter - DM, crude ash - CA, organic matter - OM, crude protein - CP, ether extract - EE, crude fiber - CF), pH, Fleig point (FP) values, and the mineral contents of maize silages. The maize hybrids were harvested at the milk-line maturity stage and ensiled as whole plant in 5-L plastic jars without additives. The jars were stored at 25 +/- 2 degrees C under standard laboratory conditions. the silages were uncovered and sampled for chemical analyses 60 days after they were ensilaged. There were statistically significant differences among maize hybrid silages for DM, CA, OM, CP, EE, CF contents, pH, and FP values (P<0.05). The DM content of silages were ranged from 25.67% in LG 55 to 32.41% in Falkner; CP (4.07% in Bora and LG 55 to 6.91% in Tivak 678); CA (4.64% in Maverik to 7.94% in LG 55); OM (17.07% in LG 55 to 27.64% in Falkner); EE (2.68% in DK 626 to 4.40% in Tivak 678); CF (17.96% in Pioneer 3167 to 27.28% in TTM 815); pH value (3.76 in TTM 815 to 4.05 in Pioneer 3167); FP (95.68 in LG 55 to 112.64 in Consur). The result of the study indicated that fermentation characteristics and nutrient contents were affected by the hybrids that were studied. However, there were no significant differences among dry matter mineral contents for As, B, Cr, Fe, Sn, Cu, Mn, and Zn (P>0.05); but there were significant differences among hybrids for Al (P<0.05).
  • [ X ]
    Öğe
    Determination of Selenium and Nickel in Asphaltite from Milli (Sirnak) Deposit in SE Anatolia of Turkey
    (Iop Publishing Ltd, 2017) Aydin, Isil; Fidan, Celal; Kavak, Orhan; Erek, Figen; Aydin, Firat
    Asphaltite is one of the naturally occurring black, solid bitumen's, which are soluble at heating in carbon disulphide band fuse. Asphaltite is also a solidified hydro carbon compound derived from petroleum [1]. According to the World Energy Council, Turkish National Committee (1998), the total reserve of the asphaltic substances that are found in south eastern Turkey is about 82 million tons, with Silopi and Sirnak reserves to get her comprising the major part of the Asphaltite deposits. Selenium and Nickel are very important elements both environmental and health. Selenium plays an important role in the formation of the enzyme antioxidant effect in the cell. The need for Selenium increases in situations such as pregnancy, menopause, grow than development, air pollution. Nickel is used for preventing iron-poor blood, increasing iron absorption, and treating weak bones. In this study, asphaltites were taken from Milli vein from Sirnak deposit in SE Anatolia of Turkey. A total of 6.500.000 tons of Asphaltite reserves have been identified as asphaltites in Milli (Sirnak). The sample preparation method was developed in Asphaltite by spectroanalytical techniques, wet acid digestion. MW-AD followed by ICP-OES were used for the determination of Selenium and Nickel in Asphaltite. Proximate analysis of Asphaltite fly ash samples was made. It also, Selenium and Nickel element analysis in Asphaltite were made.
  • [ X ]
    Öğe
    Determination of trace elements in illicit spice samples by using ICP-MS
    (Elsevier Science Bv, 2015) Bora, Taner; Aksoy, Cagdas; Tunay, Zeki; Aydin, Firat
    The narcotic and toxic effects of synthetic cannabinoids have been intensely investigated by scientists in recent years. Most of these studies have been about the effects of synthetic cannabinoid compounds on the human body. However, in this study, we aimed to determine trace element concentrations in seized spice products and observe whether they were above the limit values. The investigated spice product plants contained brooklime, which was the most popular raw material in illicit spice drugs in Turkey. The synthetic cannabinoid contents of the samples were identified by GC-MS. All samples were analyzed by ICP-MS after microwave digestion. The concentration values of Ba, Be, Co, Cr, Cu, Ni, Li, Pb, U, and Zn in three brooklime samples and twenty-nine spice samples containing brooklime were reported. Certified standard reference material CRM SRM 1573a tomato leaves were used to assess the accuracy of the method. After checking the accuracy, excess amounts of the digested CRM were also used to check the precision of the method. Trace element contents in the analyzed samples were likely to be of negligible concern. Barium was the only distinctive element determined. To our knowledge, this is the first study in this field. (C) 2015 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    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.
  • [ X ]
    Öğe
    Effect of foliar potassium and micronutrient additions on yield and fiber quality of cotton (Gossypium hirsutum L.)
    (Wfl Publ, 2009) Temiz, Mefhar; Koca, Yakup Kenan; Aydin, Firat; Karahan, Ender
    The use of high-yielding cultivars that remove high amounts of potassium and micronutrients from the soil lead to potassium and micronutrients deficiencies in Turkey. An important objective for using macro and micronutrients in cotton is to balance vegetative and reproductive growth as well as to improve lint yield and fiber quality. Field study was conducted in a randomized complete block design with three replications under irrigated conditions in the Southeastern Anatolia Region of Turkey, to determine the effects of foliar potassium, zinc and micronutrient treatments on yield and fiber quality of cotton (Gossypium hirsutum L.). Compared with the untreated control, application of foliar potassium, zinc and micronutrients insignificantly affected lint turnout, seed-cotton yield, and fiber quality parameters. Furthermore, application of foliar potassium, zinc and micronutrients increased Zn2+, Cu2+, Fe3+, Mn2+, Mg2+, Na2+, Ca2+ and K+ rates in the leaf compared with the untreated control.
  • [ X ]
    Öğe
    Elemental Composition of Red Wines in Southeast Turkey
    (Czech Academy Agricultural Sciences, 2015) Karatas, Dilek Degirmenci; Aydin, Firat; Aydin, Isil; Karatas, Huseyin
    Mineral profiles of wines and soil extracts were analysed in the five most popular international wines (Cabernet Sauvignon, Syrah, Merlot, Cot, and Tannat) and national Bogazkere, which is one of the highest-quality grapevine varieties grown in Turkey. We carried out study to establish the mineral and metal concentrations in wines from Southeast Anatolia of Turkey. The ICP-OES method was used for accurate determination of concentrations of 12 elements including Ca, Cd, Co, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, and Zn. The high levels of iron, potassium, sodium, and calcium were observed in the wine samples analysed. Major elements were also abundantly found in the soil samples. Minor element contents of wine samples were compatible with results other researches. The amount of metal content in wine is an important issue. A remarkable finding of the study was that heavy metals like Pb (found below acceptable limits only in three samples), Co, and Cd were not detected. The results obtained did not exceed the maximum acceptable limits established by the Office International de la Vigne et du Vin. Our results showed that the mineral compositions of wine and soils were interrelated. The analysis of the soil samples taken from the vineyard locations showed similar results for highest composition of major minerals. The characteristics of the wines produced in the Southeast Region of Turkey were analysed for the first time.
  • [ X ]
    Öğe
    Essential oil content, in-vitro and in-silico activities of Hypericum triquetrifolium Turra, H. empetrifolium subsp. empetrifolium Willd., and H. pruinatum Boiss. & Balansa species
    (Istanbul Univ, Fac Pharmacy, 2023) Akdeniz, Mehmet; Yener, Ismail; Kocakaya, Safak Ozhan; Yolcu, Murat; Yigitkan, Serkan; Aydin, Firat; Turkmenoglu, Fatma Pinar
    Background and Aims: The importance of Hypericum species that are used traditionally against many diseases is increasing day by day.Methods: In this study, the essential oil contents of Hypericum triquetrifolium, H. empetrifolium subsp. empetrifolium, and H. pruinatum species were determined with GC-MS/ FID. This is the first study on the antioxidant, anticholinesterase, anti-urease, antityrosinase, antielastase, and anticollagenase activities of these species. Also, in silico and in vitro enzyme in-hibitory activities of the major compounds in the essential oil samples of the species have been evaluated. In addition, the cytotoxic effects of the essential oils were determined by the MTT method.Results: According to GC-MS/ FID results, the major compounds were determined as caryophyllene oxide (16.76%) for H. triquetrifolium, alpha-pinene (21.67%) for H. empetrifolium subsp. empetrifolium, and germacrene D (22.47%) for H. pruinatum. Especially, H. pruinatum sample showed a high cytotoxic effect (IC50: 34.78 +/- 0.22 and 29.06 +/- 0.40 mu g/mL, respectively) on HT -29 and MCF-7 cell lines. It was determined that the same sample showed a promising inhibitory activity on acetyl (18.33 +/- 2.79, 36.48 +/- 2.40, and 56.97 +/- 0.94, respectively) and butyryl (71.63 +/- 2.78, 73.88 +/- 1.16, and 56.97 +/- 0.97, respectively) cholinesterase enzymes.Conclusion: Results of the in-vitro activity studies indicated that H. pruinatum essential oil could be used in the pharmaceuti-cal industry.
  • [ X ]
    Öğe
    Evaluation as time-dependent of pesticides applied in pre-harvest period of grown vegetables: removal of pesticide residues in the vegetables
    (Taylor & Francis Ltd, 2022) Elmastas, Ayhan; Umaz, Adil; Pirinc, Vedat; Aydin, Firat
    Pesticide use has benefits such as increasing the quality and amount of food required to sustain the human population. However, its harmful effects on the environment and human health are of great concern. The aim of this study was to evaluate concentrations as timedependent of the pesticide and the removal of pesticide residues in vegetable samples with the aid of the QuEChERS 2007.01 procedure. The analytical method has been validated according to SANTE/12682/2019. Good linearity (2.5-100 ng/mL, R-2 > 0.99) was observed, and the recovery yields ranged from 94.76% to 104.03%, repeatability (RSDr) ranged from 2.33% to 4.59% and reproducibility (RSDwR) ranged from 4.06% to 8.40%. LOD and LOQ values were determined to be 3.00 ng/g and 10.00 ng/g, respectively. The grown tomato, eggplant and cucumber samples were sprayed with drugs against pests and diseases. Imidacloprid in the grown tomato, cucumber and eggplant samples was determined to be 0.026, 0.186 and 0.096 mg/kg, respectively. Trifloxystrobin was determined to be 0.102, 0.129 and 0.063 mg/kg, respectively. It was determined that pesticide residue in vegetable samples decreases by washing and peeling but does not disappear completely. The peeling process was determined to be more effective than washing. The concentration of pesticide residues in the shell part was found to be hight than in the whole product. Thus, it is important to consume vegetables with their skin peeled and to consume the unpeeled ones by washing them with water at least.