Makale 2010-2019 yılları

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A computer program to help for resolution of complex and poorly resolved Cu2+ and VO2+ ions doped single EPR spectra
(Taylor & Francis, 2009-11-01) Bıyık, Recep; Çemberci, Mustafa; Tapramaz, Recep; 0000-0001-7929-4395; TAEK-ÇNAEM
Complex and poorly resolved Cu2+ and VO2+ doped single-crystal electron paramagnetic resonance (EPR) spectra are some of the serious problems that exist in this area. In order to help the resolution of this sort of spectra, and for easily resolvable spectra as well, a versatile computer program known as EPR RESolution, or EPRES, is presented. All detectable line positions in the single-crystal spectra taken in three mutually perpendicular planes are given as input. The program plots these line positions. The user then manually determines the lines by selecting the true data points on the plot and fitting them to a well-known variation function. If selection is not suitable, the process is canceled and renewed. By this process, as many resolvable lines as in the spectra can be resolved and determined. The user then groups the resolved lines according to the paramagnetic center to which they belong. This includes the attribution of correct nuclear spin I and MI to correct lines. After this step, hyperfine and g tensor elements can be found, constructed, and diagonalized. [Supplemental materials are available for this article. Go to the publisher’s online edition of Spectroscopy Letters for the following free supplemental resource: a copy of the EPRES computer program.]
A portable fast neutron radiography system for nondestructive analysis
(SCİENDO, 2019) Kam, Erol; Reyhancan, İskender Atilla; Bıyık, Recep; 0000-0001-7929-4395; TAEK-ÇNAEM
Depending on the neutron energy used, neutron radiography can be generally categorized as fast and thermal neutron radiography. Fast Neutron Radiography (FNR) with neutron energy more than 1 MeV opens up a new range of possibilities for a nondestructive inspection when the inspected object is thick or dense. Other traditional techniques, such as X-ray, gamma ray and thermal neutron radiography do not meet FNRs penetration capabilities in this area. Because of these distinctive features, this technique used in different industrial applications such as security (cargo investigation for contraband such as narcotics, explosives and illicit drugs ), gas/liquid flow and mixing, radiography and tomography of encapsulated heavy shielded low Z compound materials. The FNR images are produced directly during exposure; the neutrons create recoil protons, the protons activate a scintillator screen, the images can be collected with a computer controlled charge –coupled device (CCD) camera and finally the picture can be saved on a computer for the image processing. The aim of this research is to set up a portable fast neutron radiography (FNR) system and to test it for use in nondestructive testing of different composite materials. Experiments were carried out by using fast portative neutron generator Thermo Fischer MP320.
A review of the TAEA proficiency test on natural and anthropogenic radionuclides activities in black tea
(Elsevier B.V., 2018-04) Yeltepe, Emin; Şahin, Namık Kemal; Aslan, Nazife; Hult, Mikael; Özçayan, Gülten; Wershofen, Herbert; Yücel, Ülkü; TAEK-SANAEM
A proficiency test amongst 15 Turkish laboratories with participation of 5 non-Turkish laboratories was organized to determine the 137Cs, 40K and 90Sr massic activities in black tea powder samples. The bulk material, consisting of tea produced in 2014, was mixed with contaminated tea that was withdrawn from the market after the Chernobyl accident. Nineteen laboratories reported 41 results. The evaluation of the results was based on the accuracy and precision criteria adopted by the IAEA Proficiency Testing Group and resulted in 49% acceptable results, 19% acceptable with warning and 32% were found to be not acceptable.
Activity concentrations of 224Ra, 226Ra, 228Ra and 40K radionuclides in refinery products and the additional radiation dose originated from oil residues in Turkey
(Oxford University Press, 2013-10) Parmaksız, Aydın; Ağuş, Yusuf; Bulgurlu, Figen; Bulur, Emine; Yıldız, Çiğdem; Öncü, Tolga; AAH-5187-2020; 0000-0003-4000-5175; TAEK-SANAEM
Total of 56 crude oil, refinery product, waste water, sludge and scale samples collected from three refineries were measured by gamma-ray spectrometry. Except for nine samples, all refinery products samples were found below the minimum detectable activity (MDA) values. 224Ra, 226Ra, 228Ra and 40K activity concentrations in crude oil and refinery product samples were measured from MDA values to 11.7±4.5, 14.9±3.5, 11.6±4.5, 248.5±18.5 Bqkg-1 respectively. 224Ra, 226Ra, 228Ra and 40K activity concentrations in scale, sludge and water samples were measured from MDA values to 343.7±11.8, 809.2±29.0, 302.5±21.6, 623.0±80.9 Bqkg-1 respectively. Radium equivalent activities of residue samples were calculated up to 1241.8±42.4 Bq/kg. Maximum activity concentration index and alpha index were found 4.2 and 4.0 respectively. The annual effective doses of four residue samples were calculated equal or above permitted dose rate for public, i.e. 1mSv/y.
Activity concentrations of 226Ra, 232Th, 40K and 137Cs radionuclides in Turkish medicinal herbs, their ingestion doses and cancer risks
(Taylor and Francis, 2014-11) Parmaksız, Aydın; Ağuş, Yusuf; AAH-5187-2020; 0000-0003-4000-5175; TAEK-SANAEM
Twenty-two medicinal herb samples, each representing a distinct species, were collected from Turkish markets and measured by the gamma spectrometric method. The activity concentration of 226Ra in medicinal herbs was found in the range of minimum detectable activity (MDA) and 15.1 ± 2.2 Bqkg−1. The activity concentration of 232Th ranged from MDA values to 3.5 ± 0.8 Bqkg−1. The activity concentration of 40K varied between 50.0 ± 16.8 and 1311.5 ± 57.3 Bqkg−1. All 137Cs activity concentrations of medicinal herbs were found to have lower than MDA values. The bone surface dose, lower large intestine and colon doses were found to be 182.9, 18.8 and 18.7 µSvy−1, respectively. The highest committed effective dose originated from the annual ingestion of 1 kg medicinal herb was calculated notably low as 9.0 µSv. The cancer risk of ingestion of medicinal herbs was found to be small enough to be neglected. The selected Turkish medicinal herbs are considered safe for human consumption.
An analysis and discussion on the concepts of state responsibility and state liability in the context of a nuclear accident or radiological emergency with transboundary effects
(Süleyman BOŞÇA, 2016-01) İnal, Arda; TAEK-NGD
As is known, nuclear related activities, by its very nature, pose special risks to individuals, property and the environment. But it is also well known that nuclear energy holds significant benefits in various fields including electricity production, medicine, agriculture etc. As a result of their both risks and benefits, nuclear related activities need to be kept under a legal regime of regulations covering a regulatory framework, authorisation, continuous control, inspection and imposing sanctions to protect health and safety of persons and the environment. Therefore, very important and various responsibilities are attributed to states via international organizations and legal instruments. For instance, in accordance with the Convention on Nuclear Safety ; “Each Contracting Party shall establish and maintain a legislative and regulatory framework to govern the safety of nuclear installations.” For another instance, states must establish or designate regulatory bodies which are financially independent, separated from the organizations for utilising or promoting nuclear energy, adequately authorised and competent to set standards and enforce them within the legal framework of the state. At the present time, there are plenty of international treaties and conventions and other instruments agreed or accepted by states and innumerable of national standards or regulations to ensure nuclear safety and security to protect individuals, property, environment and even next generations. Despite all these national and international instruments, Fukushima Daiichi nuclear accident occurred in Japan in 2011 and it has shown us that, nuclear accidents may occur in anytime, anywhere despite the existence of rules, standards, regulations, laws or treaties. At this very point, nuclear liability law and liability regimes come forward and concern with procedures and principles regarding compensation of the damages caused by nuclear incidents. Nuclear liability regime is fundamentally a result of international developments emerging in the nuclear energy field and a branch comprising rules regulated by states and/or international organizations. By this means, this regime becomes a junction point between national and international law principles. Throughout this paper, states’ liability or responsibility within the context of liability regimes will be analysed and discussed. In the first section, “nuclear liability” will be scrutinised and in the second section, concepts of state responsibility and state liability in case of a nuclear accident or radiological emergency with transboundary effects will be analysed and discussed under international law and under nuclear law.
An EPR study of clinoptilolite from Bigadiç in Turkey
(Elsevier, 2016-01) Bıyık, Recep; Tapramaz, Recep; 0000-0001-7929-4395; TAEK-ÇNAEM
Natural and synthetic zeolites are industrial materials. They are used in many applications as food additives, molecular sieve to trap unwanted ingredients, as heavy metallic ions and groups, as shielding against radiations etc. EPR spectroscopy is a tool to characterize paramagnetic centers and radicals in the zeolite and clay type minerals. In this study natural cliptonilolite obtained from a mine in Bigadiç in western Anatolia, Turkey, was studied using electron paramagnetic resonance spectroscopy (EPR) at room temperature in natural form,following treatment of the samples: adsorbing of CO2, H2S, and SO2 gases, [Cu(H2O)6]2 ions and exposure to gamma rays. Mn atoms become paramagnetic Mn2+ ions when CO2 and H2S gases are adsorbed to clinoptilolite and when SO2 gas is adsorbed the system becomes unstable and the structure of the paramagnetic center changes with time. When Cu2+ ions are adsorbed to the Bigadiç clinoptilolite, the values of the EPR parameters are consistent with the distorted octahedral symmetry environment and after the exposure to gamma rays from a Co-60 source gives O23- radical.
Application of CNUREAS and MCNP5 codes to VVER-1000 MOX core computational Benchmark
(Elsevier, 2015) Şentürk Lüle, Senem; Özdemir, Levent; Erdoğan, Adem; TAEK-ÇNAEM
In order to strengthen the nuclear design calculation capacity in Turkey, CNUREAS (Cekmece Nuclear Reactor System) was developed to provide easy usage of neutronic and thermal hydraulic nuclear codes included in the CNUREAS package. It was tested and used for research reactors and PWR type power reactors. Modifications were performed to add hexagonal geometry support taking into account VVER type reactors employing hexagonal fuel assemblies that will be built in Turkey. “VVER-1000 MOX Core Computational Benchmark” was used to test new features of the CNUREAS. The maximum deviation in effective multiplication factor results of CNUREAS was 0.7% with deterministic codes and 1.5% with Monte Carlo codes. It was concluded that CNUREAS can be used for neutronic calculations of VVER type power reactors with appropriate cross section libraries and deterministic and Monte Carlo techniques give comparable results when both provided with appropriate cross section libraries.
Bakliyat ürünlerinde böceklenmeye karşı ışınlama teknolojisi
(Akdeniz İhracatçı Birlikleri, 2012-01) Aylangan, Ayça; Özyardımcı, Berna; İç, Erhan; TAEK-SANAEM
Gıda ışınlama baklagil ticaretinde karşılaşılan böceklenme problemlerini çözen, hem depolanmış hem de taze tarım ürünlerine uygulanabilen, etkinliği kanıtlanmış bir teknolojidir. Böceklenmeyi önlemek amacıyla kullanılan düşük ışınlama dozları üründe kimyasal içerik ve besin değeri açısından önemli bir değişikliğe yol açmamaktadır. Tüketici tutumuna yönelik gerçekleştirilen araştırmalarda da olumlu sonuçlar alınmaktadır. Baklagil grubu gıdaların ışınlanmasında ürün ambalajı yeniden böcek bulaşmasını önleyecek şekilde seçilmelidir. Ayrıca, baklagil grubu gıdaların ışınlanması için gerekli tesisin çalışma özelliklerini de bu gıda ambalajlarının şekil ve büyüklüğü, ürün taşıma sistemi ve ışınlama kaynağının tipi belirlemektedir.
Coğrafi orijin belirlemede kararlı izotopik ve elemental analiz yöntemlerinin kullanılması
(Atatürk Bahçe Kültürleri Merkez Araştırma Enstitüsü Müdürlüğü, 2018) Aylangan, Ayça; Oktar, Okan; Mert, Yüksel; Çantay, Eren; Ergun, Ece; İç, Erhan; Tahmaz, Hande; Söylemezoğlu, Gökhan; TAEK-SANAEM
Son yıllarda, gıda gerçekliğinin ve orijininin kontrol edilmesinin önemi genişleyen küresel pazarlara bağlı olarak artış göstermektedir. Bu küreselleşme ile tüketim mallarının kalite, gerçeklik ve orijininin belirlenmesi için gıda sektöründe daha gelişmiş izleme sistemlerine ihtiyaç doğmuştur. Ülkemizde son yıllarda giderek yaygınlaşan şaraplık üzüm yetiştiriciliğinin artması ve bunlardan elde edilen şarabın orijin kontrolünün yapılması gelişen ticaret hacmi için büyük önem taşımaktadır. Önemli şarap üreticisi Avrupa Birliği ülkelerinin yıllardır benimsediği "Kökeni Kontrollü İsimlendirme Sistemi" henüz Türkiye de yeterince uygulanmamakta, bu olumsuzluk ise Türk şaraplarının iç ve dış piyasalarda kalite şarapları ve coğrafi işarete sahip sofra şarapları karşısında rekabet gücünü zayıflatmaktadır. Gıda izlenebilirliği ve gerçekliğinin önem kazandığı Dünya’da ülkemiz açısında potansiyel üretim hacmine sahip şarabın dış rekabete hazır hale gelebilmesi için "Kökeni Kontrollü İsimlendirme Sistemi”ne geçilmesi gerekmektedir. Kararlı izotop ve elemental analiz yöntemleri kullanılarak belirli bölgelerden elde edilen şaraplarda gıda izlenebilirliğinin önemli bir parçasını teşkil eden orijin belirlenmesi yapılabilmektedir. Bu çalışmada, nükleer analitik teknikler ile belirlenen kararlı izotop analizlerinin şarap örneklerinde uygulanabilirliği ile ilgili örnekler verilmesi amaçlanmıştır.
Color and ink characterization of the Ottoman diplomatics dating from the 13th to the 20th century
(De Gruyter, 2018-11) Kantoğlu, Ömer; Ergun, Ece; Kırmaz, Rıdvan; Kalaycı, Yakup; Zararsız, Abdullah; Bayır, Önder; 0000-0002-0403-5425; TAEK-SANAEM
This study investigates the colors and inks used in the diplomatics of the Ottoman Empire dating from the 13th to 20th century. Elemental and spectroscopic analyses were carried out on more than 150 diplomatics using the µ-XRF, Raman and FTIR spectroscopies, but 10 of them were chosen representative for each century. In addition to the characterization of color and ink, the common or rare use of different colors and inks through ages is discussed. The results of the analysis of the Ottoman diplomatics revealed that minium, vermilion, red ochre and cochineal comprised the red color; lapis lazuli (ultramarine blue), azurite (blue verditer), Prussian blue and smalt were used as the blue color; malachite and green earth provided the green color; massicot was used as the yellow color; yellow lead constituted the orange color; and basic lead carbonate and zinc oxide were the source of the white color have been determined in the diplomatics of the Ottoman Empire. All the illuminations were ornamented with gold to demonstrate the power of Empire and also Emperor. The text script of the diplomatics were written in black, red and gold inks using iron gall- and carbon-based black ink (carbon black/soot), cochineal (red ink) and gold.
Comprehensive data concerning cosmic radiation doses at ground level and in-flights for Turkey
(Oxford University Press, 2016-12) Parmaksız, Aydın; AAH-5187-2020; 0000-0003-4000-5175
Cosmic radiation doses of individuals living in 81 cities in Turkey were estimated by using CARI-6 software. Annual cosmic radiation doses of individuals were found to be between 308 and 736 µSv y−1 at ground level. The population-weighted annual effective dose from cosmic radiation was determined to be 387 µSv y−1 for Turkey. Cosmic radiation doses on-board for 137 (60 domestic and 77 international) flights varied from 1.2 to 83 µSv. It was estimated that six or over long-route round-trip air travels may cause cosmic radiation dose above the permissible limit for member of the public, i.e. 1 mSv y−1. According to the assumption of flights throughout 800 h on each route, cosmic radiation doses were found to be between 1.0 and 4.8 mSv for aircrew.
Determination of effect of chemical mutagen ems on TAEK A-3 and TAEK C-10 mutant soybean varieties in M1 generation
(BİSAB, 2017) Sağel, Zafer; Tutluer, İhsan; Peşkircioğlu, Hayrettin; Kantoğlu, K. Yaprak; Kunter, Burak; TAEK-SANAEM
Ionizing radiation, chemical mutagens are also used in crop improvement and Ethylmethanesulphonate (EMS) is one of the most widely used chemical mutagens in the field of plant breeding. This research work was carried out to determine the effects of chemical mutagen (EMS) on seedling height. TAEK A-3 and TAEK C-10 soybean varieties were used as the test plants and effect of pre-soaking time determined. In greenhouse field experiments five different EMS doses (0 –control-, 0.025, 0.050, 0.075 and 1.0 M) and in greenhouse 3 pre-soaking time (0, 6 and 18 hours), in the field 2 different pre-soaking time (0 and 6 hours) were applied. After chemical mutagen application in the greenhouse germination percentage and seedling height base EMS dose and pre-soaking time effect had been determined. Effects of EMS in M1 germination of soybean for different characteristics (no. of plants, plant height, no of pods and seed yield) were determined under field conditions. As a result it can be said that in both soybean varieties, seedling height was reduced as the EMS concentration increased. But there was no distinct influence of pre-soaking time on seedling height in both soybean varieties. In both soybean varieties the average percentage of germination increased with increasing pre-soaking time. Based on results obtained in field experiment, it was concluded that by 6 hours pre-soaking the harmful physiological effect of EMS could be decreased.
Determination of effective mutagen dose for carrot (Daucus carota ssp. sativus var. atrorubens alef and D. carota) callus cultures
(Academic Hosting & Event Management Solutions, 2019) Büyükdinç, Damla Turan; Kantoğlu, K. Yaprak; Karataş, Arzu; İpek, Ahmet; Ellialtıoğlu, Ş. Şebnem; 46500; TAEK-SANAEM
Mutation breeding is used for plant variety, to obtain high yield, earliness, resistance to pest and diseases and also to abiotic stress conditions. Gamma radiation application in physical mutagen applications has advantages on the ease of use, the high permeability and the ability to reach the target cells and the nontoxic and harmful effects. It expanses the present variation by creating a mutation with physical mutagenesis via Co60 irradiation applied to in vitro donor plant tissues, and provides selection of variations at the cellular level in desired properties. Carrot is an important vegetable crops and in demand by the local markets throughout the year. This study was carried out to obtain a database and to determine the Effective Mutagen Dose (EMD50) in the course of mutation breeding studies on purple and orange carrots. For this aim, 0, 5, 10, 20, 30, 40, 50 and 60 Gray (Gy) doses of Co60 (gamma-rays) were applied to carrots calli as a physical mutagen of 30 callus pieces (each 1 g) per dose. 4-5 weeks after irradiation, shoot development of callus were determined and EMD50 calculated by linear regression analyses. As a result of the research, it was determined that 8,36 Gy was an effective mutation dose for purple carrot and 23,605 Gy for orange carrots due to the regression analyses.
Determination of effective mutagen dose for lettuce (Lactuca sativa var. longifolia cv. cervantes) seeds
(CES Science Group, 2017) Sarıçam, Şule; Kantoğlu, K. Yaprak; Ellialtıoğlu, Ş. Şebnem; 176647; TAEK-SANAEM
In plant breeding strategies induced mutagenesis has become an effective way of supplementing the existing germplasm and improving new varieties. Mutation can be induced by chemical and physical mutagens or by combination. The commercial importance and production of lettuce, which is the most popular of the local salad crops, is increasing in Turkey. Lettuce is an important vegetable commodity and in demand by the local markets throughout the year. This study was carried out to get database for mutation breeding studies on lettuce cv. Cervantes. For this aim, 0, 50, 100, 200, 300, 400, 500 and 600 Gray (Gy) doses of Co60 (gamma-rays) were treated on lettuce seeds as a physical mutagen. 30 seeds were used for each dose. Thirty days after treatment, germination and shoot developing of cloves were determined. The Effective Mutagen Dose (EMD50) calculated by linear regression analyses. According to results, 372.66 Gy dose was found as EMD50.
Determination of optimal mutagen dosage and its effects on morpho-agronomic traits in putative mutants of ‘Amasya’ apple
(Serbian Genetics Society, 2019-08) Atay, A. Nilgün; Atay, Ersin; Kunter, Burak; Kantoğlu, K. Yaprak; Kaplan, Nejdet; 0000-0002-7557-360X; TAEK-SANAEM
Mutation breeding is one of the efficient ways to create new genotypes. The starting material of this study was the ‘Amasya’, a Turkish apple cultivar. This study aimed to identify optimal mutagen dosage that is the most important prerequisite to create a proper mutant population, and evaluate the genetic variability for morpho-agronomic traits (e.g. tree height and fruit number) in the putative apple mutants of ‘Amasya’ irradiated at the optimal mutagen dosage. In the first year of the study, to determine the optimal mutagen dosage, dormant ‘Amasya’ scion woods were irradiated at 0, 10, 20, 30, 40, 50 and 60 gray dosages using 60Co source. The optimal mutagen dosage was determined as 29.01 gray for ‘Amasya’ concerning the 50% shoot length reduction in comparison to the non-irradiated control plants. In the following year, more or less 2000 dormant ‘Amasya’ scion woods were irradiated at the optimal mutagen dosage to generate a mutant population of ‘Amasya’ apple cultivar. Mutation frequency based on the visual observations of plant abnormalities was observed. Then three years, genetic uniformity was analyzed through the growth of the mutant population, and mutation frequency (%) determined. These results indicated that there was considerable genetic variability in response to irradiation for evaluated traits. Most of the plants in the putative mutant population, nearly 80%, had a significantly shorter tree height and trunk cross-sectional area than standard ‘Amasya’. The mutants/genotypes identified in this study could be used improvement of new promising apple cultivars with good agronomical traits.
Development of human resources through awareness education and training activities on occupational radiation protection for industrial radiography in Turkey
(NT Council Materials Education, 2016) Zeyrek, C. Tuğrul; Akbıyık, Hayri; 0000-0001-6744-7841; TAEK-ANAEM
Industrial radiography that uses both X-ray and gamma radiation are common widespread techniques of inspecting materials for hidden flaws. No matter what regulatory infrastructure is used, individual industrial radiographers are the most likely group of exposed workers to receive doses up to approaching relevant acceptable dose limits. In Turkey, the usage of ionizing radiation in industry is growing day by day in parallel with the technical developments in Turkey. This paper summarizes the Turkish experience in radiation protection (RP) education and training (E&T) in industrial radiography, regulatory requirements and the feedback obtained from various RP actions. The aim of this study is to provide a structural description of the course modules that are addressed to qualified experts, industrial radiographers and radiation protection officers (RPOs). The modules are mainly dedicated to radiation protection applications in industrial radiography. Assessment of this course also points out the benefits and inconveniences of pedagogical approaches in the Radiation Protection domain.
DNA damage in hair root cells as a biomarker for gamma rays exposure
(Elsevier B.V, 2013-08-30) Tepe Çam, Semra; Seyhan, Nesrin; TAEK-SANAEM
The purpose of the present research is to examine whether human hair root cells can be used for dose assessment after in vitro exposure to ionizing radiation. Hair root samples plucked from random head regions were collected from 5 healthy human subjects. Some of these hair samples were used as control and some were irradiated with 0.5 - 5 Gy of gamma ray using a Cs-137 gamma irradiator at a dose rate of 0.14 Gy/sec. DNA damage (single strand break) were determined in hair root cells of these samples using the comet assay technique. The comet assay measurements, tail length (TL) and tail moment (TM) values showed that the irradiation significantly increased (p< .05) single-strand DNA breaks in hair roots cells of the exposed samples compared to control. A linear dose-effect relationship was observed when tail-moment or tail-length was plotted against the log of the radiation dose. This research suggests a possible usage of human hair root cells as a biomarker especially for low dose radiation exposure using the comet assay technique.
Education and training activities on personal dosimetry service in Turkey
(Oxford Univ. Press, 2013) Zeyrek, C. Tuğrul; Akbıyık, Hayri; 0000-0001-6744-7841; TAEK-ANAEM
A personal dosimetry service that evaluates the occupational doses for external and internal radiation of the radiation workers is one of the main components of radiation protection programme. The education and training (E&T) activities in this field are basic aspect of the optimization of all exposures to radiation. The E&T activities in the field of occupational radiation protection at the national and international level are mainly interested and implemented by Ankara Nuclear Research and Training Center (ANRTC) in Turkey. This study describes the Turkish experience in education and training of the staff of dosimetry services, postgraduate students and medical physics experts. The first individual monitoring training course realized in 2012 in Turkey. The aim of this study is to provide a structured description of postgraduate courses that addressed to qualified experts and medical physics experts, and the modules mainly dedicated to individual monitoring.
Effect of gamma irradiation and storage on lutein and zeaxanthin in liquid, frozen and dried egg yolk samples
(Springer Verlag, 2014-08) Uygun Sarıbay, Mine; Ergun, Ece; Köseoğlu, Turhan; TAEK-SANAEM
The aim of this study was to monitor the effects of gamma irradiation and storage on the content of lutein and zeaxanthin in egg yolk samples. Liquid, frozen and dried egg samples were subjected to gamma irradiation doses of 0, 1, 2 and 3 kGy followed by storage of liquid samples at +4±1 °C for 21 days, frozen samples at -18±1 °C and dried samples at room temperature for 1 year. The xanthophyll concentrations were determined by high-performance liquid chromatography-diode array detector (HPLC-DAD). It was observed that concentrations of both lutein and zeaxanthin were decreased significantly (P < 0.05) after irradiation and during storage. The mechanism for radiation-induced degradation was proposed as radical formation which initiate chain reactions. It was suggested that during storage active radical species and oxygen caused the degradation.

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