Sağlık Hizmetleri Meslek Yüksekokulu

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Adsorptive performance of magnetic nano?biosorbent for binary dyesand investigation of comparative biosorption.
(Springer International Publishing, 2019) Tarhan; Tural; Boga; Tural;, Tuba; Bilsen; Kenan; Servet
The individual and competitive biosorption capacities of Metanil Yellow (MY) and Reactive Black 5 (RB5) by glutaraldehyde cross-linked magnetic chitosan nanoparticles (GMCNs) were studied. Competitive biosorption of the MY and RB5 dyes by the GMCNs has never been reported previously. Fourier transform infrared technique has been used to show the biosorbed MY and RB5 dyes onto GMCNs. During the studies, various essential factors influencing the biosorption, like adsorbate concentration, pH of the solution and contact time have been monitored. The equilibrium was achieved within 17 h for single dyes and 3 h for binary mixture at pH 3. The biosorption capacities were 620 mg/g for dye MY and 2549 mg/g for dye RB5 at pH 3, 30 °C. The second-order kinetic model has good compatibility with the dynamical biosorption behavior of a single dye and binary mixture. In order to study the competition biosorption of the RB5 and MY dyes in mixture solutions, the intraparticle diffusion model was used. Competition biosorption through analysis of the intraparticle diffusion model apparently favored the RB5 dye more than the MY dye on the GMCNs in mixture solutions. The biosorbent was regenerated efficiently through the alkaline solution and was then reused ten times for biosorption–desorption cycles.
Advances and applications of nanomaterial-assisted phytoremediation
(CRC Press, 2023) Jahan, Israt
Nanotechnology has the potential to drastically transform the agri-food sector with its significant applications to improve agricultural productivity and the efficiency of agrochemicals. The food sector has benefitted from the inclusion of nanoparticles in food matrixes and the nanoencapsulation of nutraceuticals. Smart packaging mate rials designed with the help of nanotechnology have been used for increasing the shelf life of stored food products. Nanomaterials have been extensively used for the delivery of important agrochemicals to enhance their bioefficacy, prevent their deg radation, and control their release. Various nanomaterials have been explored for remediation of arising environmental issues. Nanotechnology has also made a useful contribution to the utilization of huge agricultural and food wastes for production of valuable products. The existing and emerging applications of nanotechnology will contribute to environmental sustainability
Alfa-Metil benzilamin Grupları İçeren Fe3O4@SiO2 manyetik nanoparçacıklar kullanarak rasemik mandelik asidin rezolüsyonu
(2012) Tarhan; Tural; Tural, Tuba; Bilsen; Servet
Tıbbi ve tarımsal ilaçlar, besin katkı maddeleri gibi yararlı kimyasal maddeler ve sıvı kristaller, polimerler gibi materyal bilimi için gerekli enantiyomerik saf bileşiklere olan ihtiyaç son 30 yılda giderek artmıştır. Biyolojik etken maddelerin yapı ve aktivite ilişkileri incelendiğinde tek izomerlerin hedef seçici olmalarından dolayı rasemik karışımlara göre çok daha etkin oldukları görülmektedir. Ayrıca tek enantiyomerden oluşan ilaçların ya çok az ya da hiç yan etkilerinin bulunmaması da etken maddelerin tek izomerlerinin elde edilmesine olan ilgiyi artırmaktadır. Kiral bir ilaç etken maddesinin enantiyomerlerinden birisi vücutta fizyolojik olarak değişiklik yaparken diğer enantiyomeri ya etkili olmaz ya da ciddi fizyolojik zararlara neden olabilir. Bunun sonucu olarak biyolojik sistemler ve ilaçlar arasındaki kiral tanınma oldukça önemlidir. Örneğin softenon isimli bileşiğin (R)-enantiyomeri yatıştırıcı özellik gösterirken (S)-enantiyomeri embriyoda bozukluğa yol açar. Yine benzer şekilde (S)-(-)-propranolol 1960’larda kalp hastalığının tedavisi için β-bloker olarak tanımlanmıştır. Ancak enantiyomeri (R)-(+)-propranolol gebelik önleyici olarak etki eder. Buradan anlaşıldığı gibi enantiyomerler birbirine zıt etki gösterebilirler. Bu nedenle klinik kullanımda bir bileşiğin enantiyomerik saflığı çok önemlidir. Ayrıca enantiyomerlerden biri aktif diğeri inaktif özellik gösterebilir. Kiral bir bileşik olan kloroamfenikol buna en iyi örneklerden biridir. (R,R)-kloroamfenikol antibakteriyel özellik gösterirken, (S,S)-kloroamfenikol inaktif özellik göstermektedir. Bu gibi ilaçların rasemik olarak vücuda alınmasında, gerekli birim miktardaki etken maddeyi karşılamak için rasemik karışımdan iki kat almak gerekmektedir. Ayrıca başlangıç maddeleri ve kaynakların yarısı boşa harcandığı için bu ekonomik açıdan istenmeyen bir durumdur. Bu nedenlerden dolayı tek bir enantiyomer her zaman için rasemik karışıma göre daha fazla biyolojik aktivite gösterir. Biyolojik aktivite bakımından optik saflığın öneminin giderek artmasıyla optik saflığın belirlenmesi için kesin ve güvenilir metotların geliştirilmesine ihtiyaç duyulmuştur. Ayrıca bilindiği gibi son zamanlarda tek enantiyomerli ilaç satışları dünya çapında sürekli olarak büyümektedir. Bu çalışmada kiral organik asit olan mandelik asidin rasemik karışımının rezolüsyonu düşünülmektedir. Bu maddeye benzer özellik taşıyan ve ilaç olarak kullanılan kiral organik asitlere, α-arilpropiyonik asit sınıfından olan (S)-Naproxen, (S)-Ketoprofen, (S)-Flurbiprofen, (S)-Fenilpropiyonik asid ve (S)-ibuprofen örnek olarak verilebilir. Rezolüsyonu yapılmak istenen, kiral bir organik asit olan mandelik asitin her iki enantiyomerik formuda farklı farmokolojik aktiviteye sahiptir. D-mandelik asit, antibiyotik olan ilacın aktivitesini geliştirdiği için terapatik özellik göstermektedir. D-mandelik asidin bu terapik özelliğinden dolayı tıpta kullanılan yaygın ilaçların başında gelir. L-mandelik asidin kullanım alanları, hayvan sağlığında veterinerlikte ilaç ham maddesi olarak kullanılır. Yani hayvan sağlığı ve hayvan bakım ilaçlarında, oral solüsyon olarak kullanılır. Mandelik asit uzun yıllar boyunca tıpta anti bakteriyel olarak, özellikle idrar yolu enfeksiyonları tedavisinde kullanılmaktaydı. Ayrıca cilt hastalıkları tedavisinde, cilt bakım ürünlerinde özellikle yetişkinlerdeki akne sorunlarına iyi bir tedavi sunmaktadır. Rosacea hastalığında (gül hastalığı) iltihaplanma ve kızarıklıkları gidermekte, mandelik asit ürünleri lazer öncesi ve sonrasında, deride meydana gelen tahriş ve kızarıklıkları azaltmada kullanılır. Tüm bu nedenlerden dolayı Mandelik asitin enantiomerlerine ayrılması önem arz etmektedir. Fonksiyonel grup bağlı nanoparçacıklardaki son gelişmeler, biyomedikal alandaki uygulamalar için ümit verici olmuştur. Magnetit(Fe3O4) kimyasal olarak kararlı, toksik ve kanserojen olmayan bir manyetik malzemedir. Magnetit nanoparçacıkları veya nanoparçacık agregatları enzim ve protein immobilizasyonu, RNA ve DNA saflaştırması, manyetik hücre saflaştırması ve ayrılmasında yaygın olarak kullanılmaktadır. Bu uygulamalarda özellikle süperparamanyetik magnetit nanoparçacıklar tercih edilmektedir. Çünkü süperparamanyetik özellik manyetik kompozit parçacıklarının agregasyonunu önler ve manyetik alan uzaklaştırıldığında parçacıkların çözelti içinde hızlı bir şekilde dağılmalarını sağlar. Manyetik ayırma teknikleri, klasik ayırma teknikleriyle karşılaştırıldığında bazı avantajlara sahiptir. Buna bağlı olarak son zamanlarda, biyolojik moleküllerin saflaştırılma ve ayrılması için yüzeyi uygun gruplarla kaplanmış nano ve mikro parçacıkların geliştirilmesine yönelik çalışmalar önem kazanmıştır. Fonksiyonel grup bağlamaya uygun bir platform sağladığı için silika kaplı manyetik nanoparçacık ve nanoparçacık agregatları teknolojik açıdan büyük ilgi görmektedir. Özel bir uygulama için gerekli manyetik nanoparçacıklar, yüzeyde kaplanmış olan silikanın fonksiyonel gruplarının farklılaştırılması ile kolayca hazırlanabilir. Silika, hidroksil(-OH) fonksiyonel gruplarından dolayı bir kaplama metaryeli olarak önem kazanmaktadır. Fonksiyonel grup bağlı nanoparçacıklardaki son gelişmeler, biyomedikal alanda ve ilaç endüstrisindeki uygulamalar için ümit verici olmuştur. Magnetit (Fe3O4) kimyasal olarak kararlı, toksik ve kanserojen olmayan bir manyetik malzemedir. Magnetit nanoparçacıkları veya nanoparçacık agregatları enzim ve protein immobilizasyonu, RNA ve DNA saflaştırması, manyetik hücre saflaştırması ve ayrılmasında yaygın olarak kullanılmaktadır. Bu uygulamalarda özellikle süper paramanyetik nanoparçacıklar tercih edilmektedir. Bunun yanı sıra manyetik nano parçacıkların optikçe aktif (kiral) maddelerin enantiyomerlerine ayrılmasında çok önemli rol oynayacağını düşünmekteyiz. Kiral maddeler R veya S izomerik yapıda olabilir. Bu R ve S yapıların birbirinden ayrılması ilaç dünyası için çok büyük önem taşımaktadır. Çünkü var olan ilaçların birçoğu rasemik yapıda olup, etken maddenin hem R hem de S formunu içermektedir. Oysa bir hastalığın tedavisinde kullanılacak olan etken maddenin R veya S formlarından biri hastalığın tedavisinde görev görmekte diğer form ise kimyasal atık olarak vücutta kalmaktadır. Kullanılmayan form yan etki göstermeyeceği gibi zehir etkisi de gösterebilmektedir. Bu yüzden kiral ayırma her zaman için çok önemli olmuştur.
Altın nanomalzeme sentezi ve karekterizasyonu
(2019) Baran, Mehmet Fırat; Saydut, Abdurrahman
Nanobiyoteknoloji, nanobilim ve teknolojide çarpıcı ve en hızlı gelişen alanlardan biridir. Altın nanopartikülleri (AuNP'ler), yeşil sentez ile herhangi bir yüzey aktif madde, stabilizatör ve kimyasal madde kullanılmadanbıttım(Pistacia terebinthus) yaprak özütü kullanılarak elde edilmiştir. Elde edilen AuNP’lerin karekterizasyonu UV-vis, SEM-EDX, XRD, FTIR ve TGA-DTA ile yapıldı. SEM-EDX, analizi incelendiğinde sentezlenen nanomalzemelerin kristal boyutunun 100 nm’nin altında olduğu ve kristal yapısının küresel olduğu anlaşılmaktadır. UV-vis, analizi verileri gösterdiki oda koşullarında farklı zaman aralıklarında yapılan ölçümler sonucunda renk değişimi ile maksimum dalga boyunun 335 nm’de karesteristik pik verdiği görüldü. XRD analizi verilerinden kristal yapılarının boyutu 14.37 nm büyüklükte olduğu hesaplandı. Ayrıca çalışmamızda sentezlenen nanomalzemenin TGA-DTA analizi yapılarak nanoparçacıkların 1000 oC ‘ye kadar dayanıklı olduğu rapor edildi
Anoxybacillus sp. SO B1-Immobilized Amberlite XAD-16 for Solid-Phase Preconcentration of Cu(II) and Pb(II) and Their Determinations by Flame Atomic Absorption Spectrometry
(TAYLOR & FRANCIS INC, 2015) Oral, Elif Varhan; Ozdemir, Sadin; Dolak, Ibrahim; Okumus, Veysi; Dundar, Abdurrahman; Ziyadanogullari, Berrin; Aksoy, Zehra; Onat, Ruken
A new method for the determination of Cu(II) and Pb(II) by flame atomic absorption spectrometry (FAAS) after preconcentrating on a column containing Anoxybacillus sp. SO B1-immobilized Amberlite XAD-16 was developed. The functional groups of Anoxybacillus sp. SO B1 immobilized on Amberlite XAD-16 were characterized in KBr tablets by Fourier transform infrared (FT-IR) spectrometry. Various parameters such as pH, amount of the adsorbent, eluent type and volume, and flow rate of the sample solution were studied. The optimum pH values of quantitative sorption for Cu(II) and Pb(II) were found to be pH 7.0 and 5.0 and Cu(II) and Pb(II) ions could be quantitatively eluted with 5.0ml of 1.0mol L-1 HCI and 10.0ml of 0.25mol L-1 HNO3, respectively. Recoveries of Cu(II) and Pb(II) were found to be 100.9 +/- 1.57% and 100.3 +/- 0.49% (N = 5), the limits of detection of Cu(II) and Pb(II) in the determination by FAAS (3s, N = 10) were found to be 0.8 and 1.6 mu g L-1, respectively. The proposed enrichment method was applied for metal ion determination from water samples such as two parts of Tigris River water in Diyarbakir and Elazig, Lake of Hazar in Elazig, and tap water in Diyarbakir. Furthermore, the accuracy of the proposed method was verified by studying the analytical recovery and by analyzing certified reference material (NCS-DC 73350 leaves of poplar).
ANTİ-KANSER İLAÇ YÜKLENMİŞ MANYETİK O-KARBOKSİ METİL KİTOSAN NANOKOMPOZİTİN SİTOTOKSİSİTE ÇALIŞMALRI
(2019) Tarhan, Tuba; Tural, Bilsen; Tural, Servet
Günümüzde kanser kemoterapisinin en önemli sorunlarına çözüm bulmak için nanoboyutta ilaç taşıyıcı sistemler geliştirilmiştir. Nanoboyuttaki kontrollü ilaç taşıma sistemleri tümör hedeflenmesine olanak sağlamıştır. Nanotaşıyıcılar arasından, biyouyumlu polimer kaplı süperparamanyetik nanoparçacıklar dışardan uygulanan manyetik alan ile istenilen bölgeye hedeflenebilme özelliklerine sahiptirler. Bu sayede ilaç hedeflenen bölgeye güvenli bir şekilde taşınabilmektedir. Bu çalışmada daha önce sentez ve karakterizasyonu yapılmış Manyetik O-Karboksimetil Kitosan nanokompozitine anti kanser ilaç olan Topotekan yükleme çalışmaları yapılmış olup, burada topotekan yüklü manyetik O-Karboksimetil Kitosan nanokompozitinin prostat kanseri Du145 ve sağlıklı insan prostat PNT1A hücre hattı üzerine sitotoksisite çalışmaları yapılmış ve sonuçları değerlendirilmiştir. Anahtar Kelimeler: Polimer Kaplı Süperparamanyetik Nanokompozit, Topotekan, Sitotoksisite, DU145 ve PNT1A
Antibiotic Removal from the Aquatic Environment with Activated Carbon Produced from Pumpkin Seeds
(Molecules, 2022) Alacabey, İhsan
Antibiotics are among the most critical environmental pollutant drug groups. Adsorption is one of the methods used to eliminate these pollutants. In this study, activated carbon was produced from pumpkin seed shells and subsequently modified with KOH. The adsorbent obtained through this procedure was used to remove ciprofloxacin from aqueous systems. Fourier Transform-Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), elemental, X-ray Photoelectron Spectroscopy (XPS), Brunauer–Emmett–Teller (BET) and Zeta analyses were used to characterize the adsorbent. The surface area, in particular, was found to be a very remarkable value of 2730 m2/g. The conditions of the adsorption experiments were optimized based on interaction time, adsorbent amount, pH and temperature. Over 99% success was achieved in removal operations carried out under the most optimal conditions, with an absorption capacity of 884.9 mg·g−1. In addition, the Langmuir isotherm was determined to be the most suitable model for the adsorption interaction
The antioxidant and antimicrobial capacities of phenolic profiles of some Salvia L. Seeds grown in Turkey
(International Journal of Secondary Metabolite, 2021) Emre, Mustafa Yunus; Emre, İrfan; Kursat, Murat; Kirbag, Sevda; Erecevit, Pınar; Yılmaz, Ökkeş; Civelek, Şemsettin
The aim of current study is to show phenolics, antioxidant capacities and antimicrobial activities of seeds of five Salvia L. (S. frigida Boiss., S. candidissima subsp. candidissima Vahl., S. virgata Jacq., S. verticillata L. var. verticillata and S. russellii Benth.) taxa grown in Turkey. The flavonoid and phenolic acid contents were measured by using HPLC whilst the antioxidant capacities were determined by using different methods. In addition, agar well diffusion method was used to determine the antimicrobial activities of Salvia species in this study. It was found that S. frigida, S. verticillata var. verticillata and S. russellii have the highest catechin contents and S. frigida and S. verticillata var. verticillata have high rosmarinic acid while S. frigida, S. candidissima subsp. candidissima and S. verticillata var. verticillata have high vanilic acid. Also, it was determined that S. frigida and S. verticillata var. verticillata have high DPPH radical scavenging activities in 150 and 250 µL while S. frigida and S. verticillata var. verticillata have highest ABTS radical scavenging activity in all concentrations apart from 25 µL for S. frigida. Furthermore, S. frigida and S. verticillata var. verticillata have high total phenolic contents. On the other hand, Salvia species have similar lipid peroxidation inhibitions. However, the metal chelating activities of Salvia species are different. And also, it was demonstrated that Salvia taxa have antimicrobial activity.
Antioxidant Properties of Cultured Mycelia from Four Pleurotus Species Produced in Submerged Medium
(TAYLOR & FRANCIS INC, 2013) Dundar, Abdurrahman; Okumus, Veysi; Ozdemir, Sadin; Yildiz, Abdunnasir
The ethanolic extracts of dried cultured mycelia of Pleurotus ostreatus, Pleurotus eryngii, Pleurotus florida, and Pleurotus sajor-caju were analyzed for antioxidant activity in different systems. Tests used are as follows: reducing power, free radical scavenging, superoxide anion radical scavenging, total antioxidant activity, metal chelating activitiy, etc.; total phenolic content was determined. The percentage inhibition of P. ostreatus, P. eryngii, P. florida, and P. sajor-caju at 20 mg/mL concentration on peroxidation in a -carotenelinoleic acid system was 57.19, 60.68, 62.12, and 58.81%, respectively. The reducing power of P. eryngii was higher than the other samples, and its value was 0.86 at 10 mg/mL concentration. P. ostreatus and P. sajor-caju proved to be better at scavenging superoxide anion radicals than the P. eryngii and P. florida. In the scavenging effect of DPPH radical test, P. ostreatus showed the highest activity potential and P. sajor-caju showed the strongest metal chelating capacity.
Antioxidant, anticancer and anticholinesterase activities of flower, fruit and seed extracts of hypericum amblysepalum HOCHST
(Asian Pacific Organization for Cancer Prevention, 2015) Keskin, Cumali
Background: Cancer is an unnatural type of tissue growth in which the cells exhibit unrestrained division, leading to a progressive increase in the number of dividing cells. It is now the second largest cause of death in the world. The present study concerned antioxidant, anticancer and anticholinesterase activities and protocatechuic, catechin, caffeic acid, syringic acid, p-coumaric acid and o-coumaric concentrations in methanol extracts of flowers, fruits and seeds of Hypericum amblysepalum. Materials and Methods: Antioxidant properties including free radical scavenging activity and reducing power, and amounts of total phenolic compounds were evaluated using different tests. Protocatechuic, catechin, caffeic acid, syringic acid, p-coumaric acid and o-coumaric concentrations in extracts were determined by HPLC. Cytotoxic effects were determined using the MTT test with human cervix cancer (HeLa) and rat kidney epithelium cell (NRK-52E) lines. Acetyl and butyrylcholinesterase inhibitory activities were measured by by Ellman method. Results: Total phenolic content of H. amblysepalum seeds was found to be higher than in fruit and flower extracts. DPPH free radical scavenging activity of the obtained extracts gave satisfactory results versus butylated hydroxyanisole and butylated hydroxytoluene as controls. Reducing power activity was linearly proportional to the studied concentration range: 10-500 µg/mL LC50 values for H. amblysepalum seeds were 11.7 and 2.86 respectively for HeLa and NRK-52E cell lines. Butyryl-cholinesterase inhibitory activity was 76.9 ± 0.41 for seed extract and higher than with other extracts. Conclusions: The present results suggested that H. amblysepalum could be a potential candidate anti-cancer drug for the treatment of human cervical cancer, and good source of natural antioxidants.
Application of Half-Sandwich Metal-Phosphinite Compounds to Biological Activities: Determine the energies of the HOMO and LUMO levels
(Wiley Online Library, 2022) Meriç, Nermin; Rafikova, Khadichakhan; Zazybin, Alexey; Güzel, Remziye; Kayan, Cezmi; Karakaş, Duygu Elma; Dündar, Abdurrahman; ISLAM, Sholpan; Okumuş, Veysi; Aydemir, Murat
Mononuclear transition metal complexes 1-(furan-2-yl)ethyldiphenyl[dichloro(η6-p-cymene)ruthenium(II)]phosphinite, (2), 1-(furan-2-yl)ethyldiphenyl[dichloro(η6-benzene) ruthenium(II)] phosphinite (3), 1-(furan-2-yl)ethyldipheny[chloro(η4-1,5-cyclooctadiene)rhodium(I)]phosphinite (4), 1-(furan-2-yl)ethyldiphenyl[dichloro (η5pentamethylcyclopentadienyl)iridium (III)] phosphinite (5) were synthesized and characterized by microanalysis, infrared, MS, and NMR spectroscopy. The biological activities of the complexes were also tested. Compounds 2 and 5 were the best complexes at DPPH radical scavenging and reducing power activity at 73.27 % and 0.41 at 200 μg/mL, respectively. The highest antimicrobial activity exhibited by complex 3 as 14 mm inhibition zone against S. aureus. All of the complexes have cleaved the DNA from the double-strand and exhibited three bands on gel electrophoresis. Moreover, cyclic voltammetry studies of the phosphinite complexes were carried out to determine the energies of the HOMO and LUMO levels as well as to estimate their electrochemical and some electronic properties.
Asetonla Muamele Edilmiş Docetaxelin PC3 ve PNT1A Hücreleri Üzerindeki Sitotoksik Etkisi
(2021)
Bu çalışmada, prostat kanserinin tedavisinde önemli bir kemoterapötik ajan olarak kullanılan docetaxelin, insan sağlam prostat hücresi (PNT1A) ve insan kanserli prostat hücresi (PC3) üzerindeki sitotoksik etkileri araştırılmıştır. Çalışmada ticari docetaxelin saf ve asetonda bekletilmiş formu kullanılmıştır. MTT [3-(4,5-dimetiltiazol-2-il)-2,5-difenil-2H-tetrazolyum bromid] testi kullanılarak 24, 48 ve 72 saatlik inkübasyon sonrası yapılan analizlerde farklı docetaxel formlarının kullanımı arasında anlamlı bir fark bulunmadığı tespit edilmiştir (p<0.01). Elde edilen bulgular, docetaxel formlarının PC3 ve PNT1A hücreleri üzerinde doza bağımlı sitotoksik etkilerinin varlığını ortaya koymaktadır. Sitotoksik etkinin doza bağımlılığının özellikle ilk 24 saatte oldukça yüksek olduğu belirlenmiştir (PC3 için p<0.05, PNT1A için p<0.01). 48. saatte saf docetaxelin PC3 hücresi için IC50 değeri 0.0116 μg/mL, PNT1A hücresi için IC50 değeri 3.5462 μg/mL olarak hesaplanmıştır. Bu değerler docetaxelin PNT1A hücrelerinde, PC3 hücrelerine kıyasla daha düşük olsada, sitotoksik etki oluşturduğunu göstermektedir. Direnç geliştirmiş prostat kanseri hücrelerinde de terapötik etkileri olan docetaxelin ilaç taşıma sistemleri ile beraber kullanılarak sağlam hücrelerdeki hasarının azaltılması uygun bir yaklaşım olarak düşünülmektedir.
Association with Leptin Gene c.-2548 G > A Polymorphism, Serum Leptin Levels, and Body Mass Index in Turkish Obese Patients
(HUMANA PRESS INC, 2013) Say Şahin, Deniz; Tümer, Cemil; Demir, Cemil; Çelik, M. Murat; Çelik, Mustafa; Uçar, Edip; Güneşaçar, Ramazan
Leptin is a protein hormone which plays a critical role in the regulation of both body-weight through reducing food intake and stimulating energy expenditure. Several polymorphisms in leptin gene (LEP), which encodes for leptin, have been described. However, its association with obesity is still controversial. Therefore, in the present study, we aimed to investigate whether LEP c.-2548 G > A polymorphism was associated with serum leptin levels, lipid parameters, and body mass index in Turkish obese patients. Forty-seven obese patients and 48 healthy individuals were included in the study. Blood samples were collected for DNA extraction. LEP c.-2548 G > A polymorphism were detected using polymerase chain reaction-restriction fragment length polymorphism technique. Serum leptin levels and lipid parameters were measured by ELISA and enzyme colorimetric assay techniques, respectively. GA or AA genotypes and A allele carrier frequencies of the c.-2548 G > A polymorphism in the LEP were higher in obese (38.3, 34.0 and 72.3 %) when compared with controls (14.6, 12.5, and 27.1 %; p = 0.011, 0.016, and 0.002, respectively). On the other hand, AA or AG genotypes were also related to increased serum leptin levels (p < 0.001) and body mass index (p < 0.0001). All these consequences showed that LEP -2548 AA or AG genotypes are important predictors for increased levels of leptin and BMI in Turkish obese patients and it may be a useful marker for obesity risk in our population.
Basic Red 18 and Remazol Brilliant Blue R biosorption using Russula brevipes, Agaricus augustus, Fomes fomentarius
(Water Practice and Technology, 2022) Arslantaş, Ceren; M’barek, Islem; Saleh, Mohammed; Isik, Zelal; Ozdemire, Sadin; Dündar, Abdurrahman; Dizge, Nadir
In this study, the adsorption abilities of Russula brevipes (RB), Agaricus augustus (AA), and Fomes fomentarius (FF) were evaluated in Basic Red 18 (BR18) and Remazol Brilliant Blue R (RBBR) biosorption from textile effluent. The adsorbents were characterized via Scanning Electron Microscopy (SEM), Energy Dispersive Spectrometer (SEM-EDS), and Fourier transform infrared spectroscopy (FT/IR). Fomes fomentarius presented a low sorption capacity contrary to the two other fungi (RB and AA). RB and AA were selected as potential adsorbents for BR18 and RBBR, respectively. The maximum BR18 removal efficiencies for 10, 25, and 50 mg/L were obtained after 60 min to be 90, 88, and 86%, respectively. The RBBR adsorption efficiencies were 96.4, 96, and 90% for dye concentrations of 10, 25, and 50 mg/L. The adsorption of BR18 onto the RB biomass followed the Freundlich isotherm, while Langmuir is the best isotherm for RBBR sorption’s elucidation onto AA fungus biomass. The removal of BR18 by BR biomass was found to follow the pseudo-second order. In contrast, the adsorption of RBBR onto the AA biomass followed Lagergren’s pseudo-first order. For both adsorbents, the adsorption was exothermic, feasible, and spontaneous in nature. Finally, the dyes’ biosorption process was perfectly achieved onto fungi biomass via physisorption
The biochemical contents and antioxidant activities of four tanacetum L. taxa
(Progress in Nutrition, 2021) Emre, İrfan; Kürşat, Murat; Emre, Mustafa Yunus; Okkes, Yilmaz
The goal of the present study is to determine some of the biochemical compositions and antioxidant capacities of plant extracts in two endemic taxa for Turkey including T. cadmeum (Boiss.) Heywood subsp. orientale Grierson and T. nitens (Boiss. & Noë) Grierson together with T. polycephalum (L.) Sch.Bip subsp. argyrophyllum (K. Koch) Podlech, and T. parthenium (L.) Sch.Bip. The fatty acids were determined by using gas chromatography, while phenolics, lipid soluble vitamins and sterols were determined by using HPLC and radical scavenging activities, total phenolics, and FRAP were determined spectrophotometrically. It was found that Tanacetum taxa have palmitic acid (C16:0), and stearic acid (C18:0) as major saturated fatty acids and linoleic acid (C18:2 n6), α-linolenic acid (C18:3 n3) and oleic acid (C18:1 n9) as principal unsaturated fatty acids. It was found that Tanacetum taxa had more total unsaturated fatty acid contents (60.24±0.3%- 70.54±0.29%) than saturated fatty acids and it was found that T. parthenium had the highest total essential fatty acid composition (58.65%±0.59%). It was also reported that the omega6/omega3 ratio of T. cadmium subsp. orientale (8.22) differed from other taxa in this study. Also, the present study showed that Tanacetum had the lowest amount of lipid soluble vitamins. On the other hand, catechin was found to be the main polyphenolic compound in this study and it was determined that T. parthenium had the highest catechin (4479.1±5.71 µg/mg) and total phenolic contents (324.91±2.01 µgGAE/mg) in this study. Rutin was only determined in two endemic taxa T. cadmeum subsp. orientale (23±0.91 µg/mg), and T. nitens (5.7±0.27 µg/mg). Also, the naringenin, vanillic acid and caffeic acid amounts of the endemic T. cadmeum subsp. orientale and T. nitens were higher than other taxa in the study. In addition, it was determined that Tanacetum taxa had a high stigmasterol content. However, T. parthenium had a higher ergosterol content (271±2.36 µg/mg). It was also found that T. parthenium has highest D2, α-tocopherol, retinol acetate, ergosterol, and stigmasterol contents among the studied taxa. In addition, the study showed that Tanacetum taxa have strong DPPH and ABTS radical scavenging activities. It was concluded that Tanacetum taxa have potent antioxidant capacity.
Biological assays, electrochemical behavior, and theoretical DFT calculations of Ru(II) complexes of chiral phosphinite based based on β-amino alcohols: Transfer hyrogenation of ketones using a HCOOH/Et3N mixture
(Elsevier, 2024) Rafikova, Khadichakhan; Meriç, Nermin; Ertekin Binbay, Nil; Okumuş, Veysi; Sever, M. Şerif; Belyankova, Yelizaveta; Tursynbek, Saniya; Dauletbakov, Anuar; Sarah, Bayazit; Zolotareva, Darya; Yerassyl, Kamshyger; Dündar, Abdurahman
Synthesis of two phosphinite ligands based on β-amino alcohols, in high yields has been demonstrated. When we treated [Ru(arene)(μ-Cl)Cl]2 {arene:p-cymene,benzene} with chelating phosphinite ligands, we obtained neutral Ru(II)-complexes possessing the general formula [Ru(arene)phosphiniteCl2]. The structure of the ligands and complexes was confirmed using analytical and spectroscopic techniques. The quantum chemical calculations were carried out for the ruthenium complexes at the DFT/CAM-B3LYP level of theory in gas phase. The phosphinite complexes were subjected to cyclic voltammetry studies in order to determine the energies of HOMO and LUMO levels and to estimate their electrochemical and some electronic properties. Organic complex-based memory substrates were immobilized using TiO2-modified ITO electrodes, and the memory functions of phosphinite-based organic complexes were verified by chronoamperometry (CA) and open-circuit potential amperometry (OCPA). In the present study, the antioxidant potentials of ruthenium-based p-cymene and benzene complexes through DPPH radical scavenging, metal chelating, and reducing power activities were also determined. In addition, DNA binding abilities and antimicrobial activities of these complexes against pathogenic bacteria were studied. Finally, the ruthenium complex, (2S)-1-{[(2S)-2-[(diphenylphosphanyl)oxy]propyl][(1R)-1-phenylethyl]amino}propan-2-yldiphenyl phosphinitobis[dichloro(η6-benzene)ruthenium(II)] also catalyzed asymmetric transfer hydrogenation of acetophenone with high conversion (up to 99%) and good enantioselectivity (ee up to 89 %), in the existence of formic acid and triethylamine in dichloromethane medium under air atmosphere.
Biosorption of chlorophenoxy acid herbicides from aqueous solution by using low-cost agricultural wastes
(TAYLOR & FRANCIS INC, 2015) Okumus, Veysi; Celik, K. Serdar; Ozdemir, Sadin; Dundar, Abdurrahman; Kilinc, Ersin
The potential biosorption abilities of apple shell (AS), orange peel (OP), banana peel (BP), and millet waste (MW) as a bio-waste material to remove 2,4-dichlorophenoxy acetic acid (2,4-D), 2,4-dichlorophenoxy propanoic acid (2,4-DP), and 2,4-dichlorophenoxy butyric acid (2,4-DB) from aqueous solution were investigated in batch condition. Optimum biosorption conditions were determined as a function of contact time, pH of the solution, amount of biomass, and initial pesticide concentrations. The concentrations of the pesticides in the remaining solutions were simultaneously determined by high performance thin layer chromatography. Langmuir and Freundlich models were applied to describe the biosorption isotherm of the pesticides by agricultural wastes. The experimental adsorption data were fitted to Langmuir adsorption models (r(2)>0.99). It was found that adsorption of 2,4-DP was higher for all biosorbent. The highest maximum adsorption capacities of 2,4-DP were found as 40.08, 22.71, 33.26, and 45.45mg/g, respectively, for AS, OP, BP, and MW. Maximum adsorption capacity was obtained for 2,4-D as OP>MW>BP>AS, 2,4-DP as MW>AS>BP>OP, and 2,4-DB as OP>AS>BP>MW. From the results, it can be said that MW was an effective biosorbent for removal of 2,4-DP and OP was an effective biosorbent for removal of 2,4-D and 2,4-DB through the studied pesticides. Optimum biosorption conditions were determined as 60min of contact time, 100mg of biomass, AS at pH 6.0, OP at pH 6.0, MW at pH 7.0, and BP at pH 7.0. FT-IR was employed to understand the surface properties of biosorbents. According to the results, agricultural wastes have high adsorption capacity.
Biosorption of Metanil Yellow from Aqueous Solution onto glutaraldehyde cross linked magnetic chitosan nanoparticles
(10th Nanoscience and Nanotechnology Conference, June 2014, Istanbul, TURKEY, 2014, 2014) TARHAN; TURAL; TURAL;, TUBA; BİLSEN; SERVET
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Biosorption of Metanil Yellow from aqueous solution onto glutaraldehydecross linked magnetic chitosan nanoparticles
(248th National Meeting of the American¬Chemical¬Society (ACS), San Francisco, USA, 2014, 2014) TARHAN; TURAL; TURAL;, TUBA; BİLSEN; SERVET
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Biosorption Studies of Mushrooms for Two Typical Dyes
(Journal of the Turkish Chemical Society, Section A: Chemistry, 2020) Yıldırım, Ayfer; Acay, Hilal
This study investigated the adsorption behaviour of two cationic dyes, methylene blue (MB) and malachite green (MG) onto Pleurotus ostreatus, Armillaria tabescens, and Morchella conica mushrooms. The effects of contact time, initial dye concentration, and solution pH (3-11) were also determined. The adsorption on all mushrooms attained equilibrium within 120 min for both MB and MG. To evaluate the experimental kinetics data, the pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetics equations were utilised. The pseudo-first-order kinetic model demonstrated a good fit with all adsorption kinetics. The Langmuir and Freundlich isotherm models were used to analyse the mechanism of the adsorption isotherm. The adsorption equilibrium isotherm was in a good agreement with the Freundlich model. Thermodynamic parameters such as ΔH enthalpy variation, ΔS entropy variation, and ΔG free Gibbs energy variation were calculated at 303-323 K. The results suggested that the Pleurotus ostreatus mushroom was the most suitable adsorbent for both cationic dyes’ removal.

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