Kamil Özdağ Fen Fakültesi, Kimya Bölümü, Makale Koleksiyonu
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Öğe Specific and low-level detection of Hg2+ and CN- in aqueous solution by a new fluorescent probe: Its real sample applications including cell, soil, water, and food(Elsevier Science Sa, 2025) Oğuz, Mehmet; Aydın, Duygu; Malkondu, Sait; Erdemir, SerkanMercury (Hg) is one of the most hazardous heavy metals, posing a severe threat to human health. In response to this, we report a new fluorescence probe (HBT-PA) for Hg2+ detection that exhibits strong excited-state intramolecular proton transfer (ESIPT) and intramolecular charge transfer (ICT). HBT-PA exhibits an excellent "turnon" fluorescence response with high selectivity for Hg2+ ions and negative solvatochromism in many solvent environments. HBT-PA has excellent water solubility, rapid response (10 s), large Stokes shift (203 nm), and high selectivity and sensitivity for Hg2+ over other tested metal ions in water (with 0.01 % DMSO). The probe can detect Hg2+ within the micromolar range (0-50 mu M) and has a detection limit of 86 nM. In the presence of CN-, the fluorescence of a solution of [HTB-PA+ Hg2+] was quenched. Thus, the complex could be used to identify trace levels of CN- in water (with 0.01 % DMSO). The probe can be used to visualize Hg2+ ions in food, soil, and water. Moreover, it has been successfully used to develop smartphone applications, cotton swab, and polysulfone capsule kits for Hg2+ detection. Additionally, it has been effectively applied to the visualization of Hg2+ ions in living cells with low cytotoxicity and excellent biocompatibility.Öğe A "on-off" fluorescent sensor based on coumarin-furoic hydrazide for recognition of fe3+: drinking water, test strip applications and dft calculations(Springer/Plenum Publishers, 2025) Karagöz, Abdurrahman; Savran, Tahir; Yılmaz, İbrahimA coumarin based fluorescent probe (E)-N'-((7-hydroxy-2-oxo-2H-chromon-3-yl)methylene)furan-2-carbohydrazide (CFHZ) was synthesized for the detection of Fe3+ and its characterizations were carried out using spectroscopic methods such as FT-IR, mass spectrometry1H-NMR, 13C-NMR. The novel probe CFHZ showed a highly selective and sensitive "turn-off" response to Fe3+ ion without any interference from other analytes. Strong fuorescence quenching phenomena of the CFHZ were observed in EtOH:H2O (99/1, v/v) detection system (lambda em = 470 nm) upon the additions of Fe3+. The binding stoichiometry between CFHZ and Fe3+ was determined by Job's method, FT-IR and MALDI TOF-MS and found to be 2:1. Also, the binding constant was determined to be 1.82 x 105 M-1 and the limits of detection for the analysis of Fe3+ was measured as 25.7 nM. Besides, experimental applications were carried out for real-time monitoring of Fe3+ in water samples using developed sensor. Additionally, fluorescence imaging experiments for Fe3+ detection of CFHZ probe on test papers were successfully performed.Öğe Building an eco-friendly, biocompatible, and ratiometric NIR fluorescent sensor for the rapid detection of trace Pd2+ in real samples and living cells(2025) Aydın, Duygu; Erdemir, Serkan; Oğuz, Mehmet; Koçyiğit, Özkan; Malkondu, SaitThe increasing industrial use of palladium has led to its environmental accumulation, raising concerns about its toxicity to aquatic life and human health. Therefore, fluorescent probes capable of detecting Pd2+ are highly beneficial. With this objective, a new near-infrared (NIR) fluorescent probe based on a cyanine dye, 2 ((E)-2-((E)2-((dimethylcarbamothioyl)oxy)-3-(2-((Z)-1,3,3-trimethylindolin-2ylidene)ethylidene)cyclohex - 1-en-1-yl) vinyl)-1,3,3-trimethyl-3H-indol-1-ium iodide (CNS), was synthesized for selective and rapid detection of Pd2+. The detection reaction followed the elimination of thiocarbamate moiety, leading to the highly fluorescent product. CNS demonstrated remarkable sensitivity (detection limit: 0.105 mu M), high selectivity, short response time (1.0 min), long lifetime (0.88 ns), and easily detectable color changes upon Pd2+ exposure. A CNS-loaded TLC strip integrated with a smartphone detection system was able to detect Pd2+ in solutions, soil, and drug samples. In addition, CNS enabled concentration-dependent detection of Pd2+ in onion roots and epidermis. Because of low cytotoxicity, good membrane permeability, NIR fluorescence, and high contrast, CNS has been successfully applied to Pd2+ bioimaging in living cells, targeting mitochondria. Compared to existing probes, CNS offers superior sensitivity, selectivity, and adaptability for sensing applications.Öğe Voltammetric determination of mercury (ıı) ions in 5-methoxy-2-({[4-(3-methyl-3-phenyl-cyclobutyl)-thiazol-2-yl]-hydrazone}-phenyl-methyl)-phenol modified glassy carbon electrode by differential pulse voltammetry(Univ Tehran, Fac Chemistry, Center Excellence Electrochemistry, 2024) Sharifi, Hafizullah; Korkmaz, Şeyma; Mülazımoğlu, İbrahim Ender; Yılmaz, İbrahim; Yılmaz, EcirThe aim of this research is to design an electrochemical sensor for the determination of mercury (II) (Hg2+) 2+ ) ions. A new compound 5-methoxy-2-({[4-(3-methyl-phenylcyclobutyl)-thiazol-2-yl]-hydrazone}-phenyl-methylene) (MTP) phenol as a substituent on glassy carbon (GC) electrode is reported. The electrochemical behaviors of the new compound were examined by cyclic voltammetry (CV) before characterization of the modified electrode by CV, electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), and scanning electron microscopy (SEM) techniques. Determination of trace amounts of Hg2+ 2+ ions using a modified electrode was carried out using differential pulse voltammetry (DPV). To obtain optimized results, the effect of medium acidity and incubation time were investigated. The best results are pH 10.0 and incubation time (90 min), using Britton-Robinson (BR) buffer solution as the supporting electrolyte in all measurements. Under these optimal conditions, the oxidation peak current of Hg2+ 2+ ions exhibited a linear increase corresponding to concentrations ranging from 5.0 to 20.0 mu M and 50.0 to 200.0 mM. Limit of detection (LOD) and limit of quantification (LOQ) are equal to 1.12 and 3.39 mu M, respectively.Öğe 1,1?-bis(3-methyl-3-phenylcyclobutyl)-2,2?-(azanediyl) diethanol(Int Union Crystallography, 2012) Şen, Fatih; Dinçer, Muharrem; Çukurovalı, Alaaddin; Yılmaz, İbrahimThe title molecule, C26H35NO2, contains two cyclobutane rings that adopt butterfly conformations and are linked by a -CH(OH) CH2NHCH2CH(OH)- bridge. In the crystal, N-H center dot center dot center dot O, O-H center dot center dot center dot N and O-H center dot center dot center dot O hydrogen bonds together with C-H center dot center dot center dot pi interactions link the molecules.Öğe Synthesis and characterization of novel dual-capped Zn-urea nanofertilizers and application in nutrient delivery in wheat(Royal Soc Chemistry, 2022) Dimkpa, Christian O.; Campos, Maria G. N.; Fugice, Job; Glass, Katherine; Özcan, Ali; Huang, Ziyang; Singh, UpendraNanoscale nutrients are promising for improving crop performance. However, size-induced potential for drifting, segregation, or transformation warrants strategies to streamline fertilization regimes. Herein, we developed three nanofertilizers by coating urea granules with Zn nanoparticles capped with binary capping agents: N-acetyl cysteine (NAC) and sodium salicylate (SAL); NAC and urea; or SAL and urea. Coating was accomplished at 80-100% efficiencies. When evaluated in sorghum through soil application at 6.4 (rate-1) and 2.1 (rate-2) mg Zn per kg soil, the nanofertilizers influenced sorghum performance, plant accumulation, and soil retention of Zn, N, and P comparably with the control (Zn-sulfate). However, SAL-urea-Zn, NAC-SAL-Zn, and NAC-urea-Zn nanofertilizers evoked rate-dependent significant (P < 0.05) effects compared to Zn-sulfate. Early SPAD (chlorophyll) counts were significant with SAL-urea-Zn rate-1, compared to Zn-sulfate. NAC-SAL-Zn and SAL-urea-Zn rate-1 significantly increased shoot biomass, compared to Zn-sulfate. Notably, NAC-urea-Zn rate-2 strongly promoted grain or total above-ground Zn or N accumulation compared to SAL-urea-Zn rate-1, NAC-SAL-Zn rate-1, or NAC-urea-Zn rate-1, indicating that a lower rate of Zn can be used for NAC-urea-Zn to facilitate Zn and N delivery. Residual soil Zn was significantly higher with NAC-SAL-Zn rate-1, compared to Zn-sulfate. However, residual ammonium was significantly higher in Zn-sulfate, compared to other treatments, except for NAC-urea-Zn rate-2. Contrarily, residual P was significantly higher with SAL-urea-Zn rate-1 than with Zn-sulfate. These findings indicate that coating of urea with Zn nanoparticles can facilitate the application of nanoscale nutrients in agriculture, without any penalty on plant performance or nutrient delivery.Öğe Reversible NIR emitting fluorescent sensor with biocompatible and large Stokes shift for the Zn2+in environmental samples and living cells(Elsevier Sci Ltd, 2024) Aydın, Duygu; Oğuz, Mehmet; Alıcı, Önder; Erdemir, SerkanHerein, a simple dicyanoisophoron-based near-infrared (NIR) fluorescent sensor IQ has been designed and constructed for the rapid recognition of Zn2+ in environmental samples and living systems. The synthesized NIR sensor IQ in H2O/EtOH/ (1/9, v/v) displayed excellent recognition performances towards Zn2+ including nanomolar detection limit (60.5 nM) and a large Stokes shift (173 nm). Sensor IQ was successively applied to realize the determination of Zn2+ in smartphone applications. Furthermore, IQ-loaded test strips, cotton swabs, and polysulfone capsules were able to quickly determine the presence of Zn2+. Besides, IQ was effectively employed to monitor Zn2+ content in actual environmental samples (tap, pure, and lake water samples, rice, and potato). Additionally, the imaging potential of IQ was utilized to visualize Zn2+ in living cells. The results from these applications indicated that the designed probe IQ is hopeful to be utilized for the recognition of Zn2+ in multiple applications.Öğe Novel optical microcapsule sensor for effective recognition of Hg(Iı) and Ag (I) ions in the aquatic environments(Elsevier Sci Ltd, 2025) Bilgiç, Ali; Çimen, Aysel; Bayrak, Melike; Kurşunlu, Ahmed NuriBecause conventional methods for the detection of heavy metal ions in water involve expensive equipment and complex procedures, there is a lot of interest in the improvement of simple and quick methods for determining heavy metal ions in water. Use of natural polymers as biosorbents such as sporopollenin for heavy metal removal is advantageous. There is an urgent demand to devise a simple method for the simultaneous detection of metal ions, especially in the case of mercury(II) and silver(I) coexisting among metals. Therefore, in this study, a fluorescent microcapsule sensor (SpT-P[5]-EB), the modified sporopollenin surface based-on a combination of Pillar[5]arene and Bodipy, was developed to detect silver(I) and mercury(II) ions simultaneously or separate with an on-off principle in the aquatic environment. The fluorescent microcapsule, SpT-P[5]-EB, indicated a high sensitivity and excellent selectivity for both silver(I) and mercury(II) ions with detection limits of 1.51 mu M and 0.72 mu M, respectively. The Hg(II) and Ag(I) ions may be detected simultaneously or individually using the SpT-P[5]-EB microcapsule sensor in easy, practical, and affordable procedures.Öğe Synthesis, characterization, and application of novel fluorescent sporopollenin for effective detection of mercury (II) ions from aqueous media(Elsevier, 2024) Bayrak, Melike; Çimen, Aysel; Bilgiç, AliIn this investigation, a novel environmentally friendly functionalized fluorescent Sp-TAB hybrid material was advanced for the sensitive detection of environmentally polluting Hg(II). The characterization of the synthesized fluorescent Sp-TAB hybrid material using SEM and EDX provided insights into morphological and structural changes in the material's pore structure, while XRD and FT-IR analyses revealed the impact of the prepared material at each stage. Optimal parameters such as temperature, contact time, and pH influencing Hg(II) ion detection were determined. Application of the fluorescent Sp-TAB hybrid material was determined a detection limit (LOD) of 4.87 mu M for Hg(II) ions. This study shows the potential of the immobilization-enhanced fluorescent Sp-TAB hybrid material for sensitive Hg(II) ion detection in tap water. Additionally, this study is believed to serve as a model for sensitive and practical detection applications of heavy metals in the future.Öğe L-Dopa Synthesis Catalyzed by Tyrosinase İmmobilized in Poly(ethyleneoxide) Conducting Polymers(Elsevier Science Bv, 2013) Yıldız, Hüseyin Bekir; Calışkan, Salim; Kamacı, Musa; Calışkan, Abdullah; Yılmaz, Hasim1-3,4-Dihydroxy phenylalanine called as L-Dopa is a precursor of dopamine and an important neural message transmitter and it has been a preferred drug for the treatment of Parkinson's disease. In this study, with regards to the synthesis of L-Dopa two types of biosensors were designed by immobilizing tyrosinase on conducting polymers: thiophene capped poly(ethyleneoxide)/polypyrrole (PEO-co-PPy) and 3-methylthienyl methacrylate-co-p-vinylbenzyloxy poly(ethyleneoxide)/polypyrrole (CP-co-PPy). PEO-co-PPy and CP-co-PPy were synthesized electrochemically and tyrosinase immobilized by entrapment during electropolymerization. L-Tyrosine was used as the substrate for L-Dopa synthesis. The kinetic parameters of the designed biosensors, maximum reaction rate of the enzyme (V-max) and Michaelis Menten constant (K-m) were determined. V-max were found as 0.007 mu mol/(min electrode) for PEO-co-PPy matrix and 0.012 mu mol/(min electrode) for CP-co-PPy matrix. K-m values were determined as 3.4 and 9.2 mM for PEO-co-PPy and CP-co-PPy matrices, respectively. Optimum temperature and pH, operational and shelf life stabilities of immobilized enzyme were also examined. (c) 2013 Elsevier B.V. All rights reserved.Öğe Low-level tracking palladium species with a xanthene-indandione conjugated system in foodstuff, environmental samples, and living cells(Elsevier Sci Ltd, 2025) Altun, Ayşe Betül; Aydın, Duygu; Oğuz, Mehmet; Erdemir, SerkanPalladium (Pd) is a significant heavy metal with outstanding catalytic properties, extensively utilized in the pharmaceutical industry and organic chemistry. Due to the detrimental impact of palladium on human health and the environment, there is a pressing need for efficient and convenient analytical techniques. In this context, we have created a simple fluorescent switch-on probe, INX-Pd, for the selective determination of Pd0. The allyl carbonate in INX-Pd could be entirely cleaved by Pd0 to produce the intermediate INX-OH, resulting in distinct colorimetric and fluorometric alterations. INX-Pd displayed high sensitivity in detecting Pd0, with a detection limit of 56 nM, and a fast response time (2.0 min). INX-Pd was successively utilized to determine Pd0 in drugs, water, soil, and various foodstuff samples as well as smartphone and test strips. Moreover, cell imaging experiments demonstrated that INX-Pd is suitable for imaging Pd0 in living cells.Öğe Selective chromo-fluorogenic chemoprobe for nm al3+ recognition: experimental and living-cell applications(Springer/Plenum Publishers, 2024) Genç, Hayriye Nevin; Yaşar, Özlem Güçtekin; Boran, Tuğçe; Elmas, Şükriye Nihan Karuk; Arslan, Fatma Nur; Yılmaz, İbrahim; Sirit, AbdülkadirA rhodamine based chemoprobe BESN was engineered and employed as a selective ''OFF-ON'' chromo-fluorogenic sensor for Al3+ in H2O:MeOH (1:9, v:v). Notable changes in the absorption and emission spectra of BESN were clearly detectable upon the addition of Al3+. Sensitivity and binding mechanism studies demonstrated a good sensing performance of BESN with nanomolar detection limit (130 nM), and it was found to be highly selective towards interfering metal ions. Besides, the binding constant between BESN and Al3+ was found to be 3.19 x 10(3) M-1. Then, the validation study of BESN for Al3+ was performed based on significant analytical parameters and statistical tests. The binding of Al3+ with BESN (1:1) was probed via infrared, high-resolution mass and emission (Job's plot) spectroscopy measurements. The sensing performance of BESN could make it ideal chemosensor for real applications including vegetable, tuna fish and water samples, also for Smartphone and test-kit applications. The recovery values of the BESN to Al3+ were estimated within a range from 95.13% to 105.30% for water, 94.63% to 109.62% for tuna fish and 94.80% to 109.80% for vegetable samples. Additionally, the BESN has very low cytotoxicity and was triumphantly utilized for the recognition of Al3+ in living-cells.Öğe İletken aşı kopolimerlerinin yapısal analizi(2002) Hacaloğlu, Jale; Toppare, Levent; Özdilek, Ceren; Levent, AnılBu çalışmada, iletken polimerlerin mekanik özelliklerini geliştirmek amacı ile elektrokimyasal olarak sentezlenen aşı kopolimerlerinin yapısal analizde direkt piroliz kütle spektrometre ve Curie noktası piroliz kütle spektrometre ve Curie noktası piroliz gaz kromatografi kütle spektrometre teknikleri kullanılmış ve elde edilen kopolimerin blok kopolimer yapısına sahip olduğu saptanmıştır. Sonuçlarımız, direkt piroliz tekniğinin poilimerin yapılarının, ısıl kararlılıklarının ve ısıl bozunun mekanizmalarının belirlenmesinde daha etkin olduğunu göstermiştir. Curie noktası piroliz tekniğinin ise kararlı ısıl bozunum ürünlerinin belirlenmesinde etkili olduğu saptanmıştır.Öğe A comparative study on 2-(2-benzylidenehydrazinyl)-4-(3-methyl-3-phenylcyclobutyl) thiazole : X-ray, hf and dft studies(2016) Ferah, Buse; Yılmaz, İbrahim; Dinçer, Muharrem; Çukurovalı, AlaaddinBileşiğimiz 2-(2- benziliden hidrazinil)-4-(3- metil-3-fenilsiklobütil) tiyazol (C21H21N3S) hazırlandı ve X-ışını tek kristal kırınımı IR ve NMR spektroskopileri ile karakterize edildi. Bileşiğimiz triklinik kristal sisteme sahip olup P1 uzay grubuna sahip olan kristalin parametreleri a = 5.8973(4) Å, b = 10.4727(18) Å, c = 15.136(2) Å , ? = 86.505(13)?, ? = 84.242(12)?, ? = 89.870(13)? ve Z = 2. Moleküler geometri 6-31G(d) baz seti ile Hartree-Fock ve Yoğunluk Fonksiyoneli Teorisi (DFT) (B3LYP) metodları kullanılarak optimize edildi. Moleküler elektrostatik potensiyel (MEP) ve sınır moleküler orbitaller (FMO) HF/6-31G(d) metodu ile hesaplandıÖğe Immobilization of 2-(2-hydroxybenzylidinoamino) pyridin-3-ol on silica gel and application to industrial wastewater(Elsevier B.V., 2019) Çimen, Aysel; Bilgiç, AliIn this study, first silica gel surface was activated. The compound (3-Chloropropyl)triethoxysilane (CPTS) was immobilized on the modified SiO2 surface. 2-(2-Hydroxybenzylidinoamino) pyridin-3-ol (HBAP) compound was covalently immobilized on the modified silica gel compound (Si-CPTS). The newly prepared Si-CPTS-HBAP was characterized with a variety of techniques, including Fourier transform ınfrared spectroscopy and scanning electron microscopy. Batch method was used for the adsorption study of Cr(III) ions. The amount of adsorption of Cr(III) ions was controlled and detected by ultraviolet-visible spectrophotometer. The influences of concentration, temperature, contact time, and pH on the adsorption of Si-CPTS-HBAP were investigated. The results were obtained by Langmuir, Freundlich, and Dubinin–Radushkevich isotherm equations. In addition, thermodynamic parameters such as free energy (?H°), entropy (?S°), and enthalpy (?G°) were calculated from the sorption results and used to explain the adsorption mechanism. The optimum values obtained from this study are 6, 120 min, 0.05 g, and 303.15 K for pH, interaction time, adsorbent amount, and temperature, respectively. The results indicate that this adsorbent can successfully be employed in the separation of Cr(III) from aqueous solutions. © 2019 Elsevier Inc.Öğe L-Dopa synthesis catalyzed by tyrosinase immobilized in poly(ethyleneoxide) conducting polymers(Elsevier B.V., 2013) Yildiz, Huseyin Bekir; Caliskan, Salim; Kamaci, Musa; Caliskan, Abdullah; Yilmaz, Hasim1-3,4-Dihydroxy phenylalanine called as l-Dopa is a precursor of dopamine and an important neural message transmitter and it has been a preferred drug for the treatment of Parkinson's disease. In this study, with regards to the synthesis of l-Dopa two types of biosensors were designed by immobilizing tyrosinase on conducting polymers: thiophene capped poly(ethyleneoxide)/polypyrrole (PEO-co-PPy) and 3-methylthienyl methacrylate-co-p-vinylbenzyloxy poly(ethyleneoxide)/polypyrrole (CP-co-PPy). PEO-co-PPy and CP-co-PPy were synthesized electrochemically and tyrosinase immobilized by entrapment during electropolymerization. l-Tyrosine was used as the substrate for l-Dopa synthesis. The kinetic parameters of the designed biosensors, maximum reaction rate of the enzyme (Vmax) and Michaelis Menten constant (Km) were determined. Vmax were found as 0.007?mol/(minelectrode) for PEO-co-PPy matrix and 0.012?mol/(minelectrode) for CP-co-PPy matrix. Km values were determined as 3.4 and 9.2mM for PEO-co-PPy and CP-co-PPy matrices, respectively. Optimum temperature and pH, operational and shelf life stabilities of immobilized enzyme were also examined. © 2013 Elsevier B.V.Öğe Authenticity verification of extra virgin olive oils harvested in Mut (Mersin) region by synchronous fluorescence spectroscopy and chemometrics: approaches on LDA and HCA models(Karamanoğlu Mehmetbey Üniversitesi, 2023) Arslan, Fatma Nur; Varlı, İsmailIn this work, synchronous fluorescence (SyF) spectroscopy data of extra virgin olive oils (VOOs) harvested from two different harvest terms (2019 and 2020 October) in Mut (Mersin) region and other edible oils were analyzed by linear discriminant analysis (LDA) and hierarchical cluster analysis (HCA) to verify their authenticity. The emission and excitation monochromators were synchronously employed and the data were obtained in the emission wavelength region of 200–800 nm. A robust LDA model was gained to authenticate the extra VOOs and other edible oils: 98.28% of the tested samples were correctly predicted, and HCA dendograms showed successful discriminations with high sensitivity and specificity. The findings show the capability of SyF spectroscopy coupled with chemometrics and offer a promising methodology for confirming the possible adulteration of extra VOOs with inexpensive edible oils. Furthermore, this simple and rapid methodology doesn’t need any chemical usage and laborious procedures through the analysis.Öğe Fabrication and characterization of new Fe3O4@SiO2@TiO2-CPTS-HBAP (FST-CH) nanoparticles for photocatalytic degradation and adsorption removal of rhodamine B dye in the aquatic environment(Elsevier Ltd., 2024) Çimen, Aysel; Bilgiç, Ali; Bayrak, MelikeIn this study, Fe3O4@SiO2@TiO2-CPTS-HBAP (FST-CH) nanoparticle was prepared for the simultaneous adsorption and photocatalytic degradation of aromatic chemical pollutants (Rhodamine B dye) in aqueous solution. FST-CH nanoparticle was characterized using scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), Energy Dispersive X-Ray (EDX) Fluorescence Spectrometer and X-Ray Diffraction (XRD) spectroscopy. The photocatalytic activity of rhodamine B dye (RhB) was evaluated with a Kerman UV 8/18 vertical roller photoreactor. About 56% of RhB in aqueous medium was adsorbed by FST-CH nanoparticles with only 45 min of stirring in the dark, and about 77.01% was degraded or converted to other structures under the photoreactor for 120 min. The photocatalytic degradation of RhB (apparent rate constant: 0.0026 mg dm−3 min−1) occurred by a pseudo-second order reaction. In addition, the recovery of the prepared magnetic FST-CH nanoparticle by an external magnetic field, exhibiting good magnetic response and reusability, shows that the obtained magnetic FST-CH nanoparticle is stable and maintains high degradation ratio and catalyst recovery even after four cycles. Thus, the prepared FST-CH nanoparticle can be highly recommended for its use in potential applications of water decontamination.Öğe Ultrafast and nanomolar detection of Al3+: Furazan based fluorescent chemosensor and its practices in Smartphone, test kit, water samples and living–cell(Elsevier Ltd., 2024) Karuk Elmas, Şükriye Nihan; Boran, Tuğçe; Arslan, Fatma Nur; Özhan, Gül; Erdemir, SerkanA new fluorescent chemoprobe (SDAF) was successfully synthesized and utilized as a sensor for the recognition of Al3+ in EtOH:HEPES (3:2, v:v, pH: 7.0) media. The SDAF depicted a selective “turn–on” response at λem = 467 nm to Al3+ over competitive cations, and the SDAF–Al3+ complex had a reversible response with F−. The limit of detection (LOD) was found about at nano–molar level (28.0 nM), demonstrating the sensitivity of the chemoprobe toward Al3+. The binding stoichiometry of SDAF–Al3+ was investigated by TOF–MS, Job's plot, 1H NMR and 13C NMR methods and found as 1:1. The recognition mechanisms of SDAF for the detection of Al3+ were the –C = N isomerization and photoinduced electron transfer (PET) mechanisms, and they were confirmed by density functional theory (DFT) computation. Furthermore, the SDAF was successfully employed in living–cell bioimaging and cytotoxicity, it was also utilized in Smartphone, test–kit and natural spring water (recovery values; 89.01 %– 96.33 %)applications.Öğe Ultra-hybrid sensor based on magnetic and fluorescent biomaterial for the sensitive/selective detection of toxic Ag+ and Hg2+ ions in real samples(Elsevier Ltd., 2024) Bilgiç, Ali; Çimen, Aysel; Bayrak, Melike; Kurşunlu, Ahmed NuriThe development of high-performance, eco-friendly and magnetic sensors prepared from natural products have recently attracted a lot of attention for the selective detection of metal ions in aqueous environments and the simultaneous detection of metals in the same environment. In this study, a fluorescent and magnetic sensor (MSp-P[5]-EN-B) was prepared by the immobilization of Bodipy and pillar [5]arene on the sporopollenin surface modified by Fe3O4 for the selective detection of Ag+ and Hg2+ ions separately and together in the aqueous solution. The characterization of the fluorescent and magnetic sensor, MSp-P[5]-EN-B, was supported by techniques such as SEM, FT-IR, and XRD. The fluorescence data of MSp-P[5]-EN-B sensor was examined with various concentrations in the range 1–100 μM that in here, an “on-off” fluorescence process for Ag+, and Hg2+ and the detection limits are 0.019 μM and 0.33 μM, respectively. As a result, the designed magnetic MSp-P[5]-EN-B sensor showed strong potential in terms of its accurate, sensitive, and practical application in the separate and simultaneous detection of Ag+ and Hg2+ ions in aqueous media.
