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Bioinorganic Chemistry and Applications

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https://www.readbyqxmd.com/read/28555093/enhanced-adsorption-of-selenium-ions-from-aqueous-solution-using-iron-oxide-impregnated-carbon-nanotubes
#1
Omer Y Bakather, Ahmad Kayvani Fard, Ihsanullah, Majeda Khraisheh, Mustafa S Nasser, Muataz Ali Atieh
The aim of this research was to investigate the potential of raw and iron oxide impregnated carbon nanotubes (CNTs) as adsorbents for the removal of selenium (Se) ions from wastewater. The original and modified CNTs with different loadings of Fe2O3 nanoparticles were characterized using high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray diffractometer (XRD), Brunauer, Emmett, and Teller (BET) surface area analyzer, thermogravimetric analysis (TGA), zeta potential, and energy dispersive X-ray spectroscopy (EDS)...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28539854/the-effect-of-hydrofluoric-acid-surface-treatment-on-the-cyclic-fatigue-resistance-of-k3-niti-instruments
#2
Kee-Yeon Kum, Seok Woo Chang
The aim of this study was to investigate the effect of 50% hydrofluoric acid (HF) surface treatment on the cyclic fatigue resistance (CFR) of K3 NiTi instruments. Twenty as-received and twenty HF-treated K3 NiTi instruments were compared in CFR. The surface texture and fracture surface of two instrument groups were examined with a scanning electron microscope (SEM). Additionally, any change of Ni and Ti composition from both instrument groups was investigated using energy dispersive spectrometry. The results were analyzed with t-test...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28487625/a-comparative-study-of-raw-and-metal-oxide-impregnated-carbon-nanotubes-for-the-adsorption-of-hexavalent-chromium-from-aqueous-solution
#3
Muhammad I Qureshi, Faheemuddin Patel, Nadhir Al-Baghli, Basim Abussaud, Bassam S Tawabini, Tahar Laoui
The present study reports the use of raw, iron oxide, and aluminum oxide impregnated carbon nanotubes (CNTs) for the adsorption of hexavalent chromium (Cr(VI)) ions from aqueous solution. The raw CNTs were impregnated with 1% and 10% loadings (weight %) of iron oxide and aluminum oxide nanoparticles using wet impregnation technique. The synthesized materials were characterized using scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Batch adsorption experiments were performed to assess the removal efficiency of Cr(VI) ions from water and the effects of pH, contact time, adsorbent dosage, and initial concentration of the Cr(VI) ions were investigated...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28458618/a-review-on-platelet-activating-factor-inhibitors-could-a-new-class-of-potent-metal-based-anti-inflammatory-drugs-induce-anticancer-properties
#4
REVIEW
Vasiliki D Papakonstantinou, Nefeli Lagopati, Effie C Tsilibary, Constantinos A Demopoulos, Athanassios I Philippopoulos
In this minireview, we refer to recent results as far as the Platelet Activating Factor (PAF) inhibitors are concerned. At first, results of organic compounds (natural and synthetic ones and specific and nonspecific) as inhibitors of PAF are reported. Emphasis is given on recent results about a new class of the so-called metal-based inhibitors of PAF. A small library of 30 metal complexes has been thus created; their anti-inflammatory activity has been further evaluated owing to their inhibitory effect against PAF in washed rabbit platelets (WRPs)...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28420949/removal-of-zinc-from-aqueous-solution-by-optimized-oil-palm-empty-fruit-bunches-biochar-as-low-cost-adsorbent
#5
Seyed Ali Zamani, Robiah Yunus, A W Samsuri, M A Mohd Salleh, Bahareh Asady
This study aims to produce optimized biochar from oil palm empty fruit bunches (OPEFB), as a green, low cost adsorbent for uptake of zinc from aqueous solution. The impact of pyrolysis conditions, namely, highest treatment temperature (HTT), heating rate (HR), and residence time (RT) on biochar yield and adsorption capacity towards zinc, was investigated. Mathematical modeling and optimization of independent variables were performed employing response surface methodology (RSM). HTT was found to be the most influential variable, followed by residence time and heating rate...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28386208/adsorption-of-toluene-and-paraxylene-from-aqueous-solution-using-pure-and-iron-oxide-impregnated-carbon-nanotubes-kinetics-and-isotherms-study
#6
Aamir Abbas, Basim Ahmed Abussaud, Ihsanullah, Nadhir A H Al-Baghli, Halim Hamid Redhwi
Multiwall carbon nanotubes (CNTs) and iron oxide impregnated carbon nanotubes (CNTs-iron oxide) were investigated for the adsorption of hazardous toluene and paraxylene (p-xylene) from aqueous solution. Pure CNTs were impregnated with iron oxides nanoparticles using wet impregnation technique. Various characterization techniques including thermogravimetric analysis, scanning electron microscopy, elemental dispersion spectroscopy, X-ray diffraction, and nitrogen adsorption analysis were used to study the thermal degradation, surface morphology, purity, and surface area of the materials...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28373829/hazardous-effects-of-titanium-dioxide-nanoparticles-in-ecosystem
#7
REVIEW
Syed Niaz Ali Shah, Zahir Shah, Muzammal Hussain, Muzaffar Khan
Although nanoparticles (NPs) have made incredible progress in the field of nanotechnology and biomedical research and their applications are demanded throughout industrial world particularly over the past decades, little is known about the fate of nanoparticles in ecosystem. Concerning the biosafety of nanotechnology, nanotoxicity is going to be the second most priority of nanotechnology that needs to be properly addressed. This review covers the chemical as well as the biological concerns about nanoparticles particularly titanium dioxide (TiO2) NPs and emphasizes the toxicological profile of TiO2 at the molecular level in both in vitro and in vivo systems...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28348509/equilibrium-kinetic-and-thermodynamic-studies-on-the-adsorption-of-cadmium-from-aqueous-solution-by-modified-biomass-ash
#8
Lei Xu, Xuebo Zheng, Hongbiao Cui, Zhenqiu Zhu, Jiani Liang, Jing Zhou
Natural biomass ash of agricultural residuals was collected from a power plant and modified with hexagonal mesoporous silica and functionalized with 3-aminopropyltriethoxysilane. The physicochemical and morphological properties of the biomass ash were analyzed by ICP-OES, SEM, TEM-EDS, FTIR, and BET analysis. The adsorption behavior of the modified product for Cd(2+) in aqueous solution was studied as a function of pH, initial metal concentration, equilibrium time, and temperature. Results showed that the specific surface area of the modified product was 9 times that of the natural biomass ash...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28316540/x-ray-crystallographic-analysis-epr-studies-and-computational-calculations-of-a-cu-ii-tetramic-acid-complex
#9
Dimitrios Matiadis, Dimitrios Tsironis, Valentina Stefanou, Olga Igglessi-Markopoulou, Vickie McKee, Yiannis Sanakis, Katerina N Lazarou, Athanassios Chrissanthopoulos, Spyros N Yannopoulos, John M Markopoulos
In this work we present a structural and spectroscopic analysis of a copper(II) N-acetyl-5-arylidene tetramic acid by using both experimental and computational techniques. The crystal structure of the Cu(II) complex was determined by single crystal X-ray diffraction and shows that the copper ion lies on a centre of symmetry, with each ligand ion coordinated to two copper ions, forming a 2D sheet. Moreover, the EPR spectroscopic properties of the Cu(II) tetramic acid complex were also explored and discussed...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28293149/syntheses-characterization-resolution-and-biological-studies-of-coordination-compounds-of-aspartic-acid-and-glycine
#10
Temitayo Aiyelabola, Ezekiel Akinkunmi, Isaac Ojo, Efere Obuotor, Clement Adebajo, David Isabirye
Enantiomerically enriched coordination compounds of aspartic acid and racemic mixtures of coordination compounds of glycine metal-ligand ratio 1 : 3 were synthesized and characterized using infrared and UV-Vis spectrophotometric techniques and magnetic susceptibility measurements. Five of the complexes were resolved using (+)-cis-dichlorobis(ethylenediamine)cobalt(III) chloride, (+)-bis(glycinato)(1,10-phenanthroline)cobalt(III) chloride, and (+)-tris(1,10-phenanthroline)nickel(II) chloride as resolving agents...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28286459/antimicrobial-properties-of-copper-nanoparticles-and-amino-acid-chelated-copper-nanoparticles-produced-by-using-a-soya-extract
#11
I DeAlba-Montero, Jesús Guajardo-Pacheco, Elpidio Morales-Sánchez, Rene Araujo-Martínez, G M Loredo-Becerra, Gabriel-Alejandro Martínez-Castañón, Facundo Ruiz, M E Compeán Jasso
This paper reports a comparison of the antibacterial properties of copper-amino acids chelates and copper nanoparticles against Escherichia coli, Staphylococcus aureus, and Enterococcus faecalis. These copper-amino acids chelates were synthesized by using a soybean aqueous extract and copper nanoparticles were produced using as a starting material the copper-amino acids chelates species. The antibacterial activity of the samples was evaluated by using the standard microdilution method (CLSI M100-S25 January 2015)...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28270743/synthesis-characterization-and-biological-activities-of-coordination-compounds-of-4-hydroxy-3-nitro-2h-chromen-2-one-and-its-aminoethanoic-acid-and-pyrrolidine-2-carboxylic-acid-mixed-ligand-complexes
#12
Temitayo Aiyelabola, Ezekiel Akinkunmi, Efere Obuotor, Idowu Olawuni, David Isabirye, Johan Jordaan
Coordination compounds of 4-hydroxy-3-nitro-2H-chromen-2-one and their mixed ligand complexes with aminoethanoic acid and pyrrolidine-2-carboxylic acid were synthesized by the reaction of Cu(II) and Zn(II) salts in molar ratio 1 : 2 for the coumarin complexes and 1 : 1 : 1 for the mixed ligand complexes, in basic media. The compounds formed were characterized using infrared, Uv-vis spectrophotometric analyses, mass spectrometry, magnetic susceptibility measurements, and EDX analyses. It was concluded that 4-hydroxy-3-nitro-2H-chromen-2-one coordinated as a monobasic ligand for all the complexes; it also coordinated via the carbonyl moiety in the case of the Cu(II) mixed ligand complexes...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28210204/physicochemical-properties-of-epoxy-resin-based-and-bioceramic-based-root-canal-sealers
#13
Ju Kyung Lee, Sang Won Kwak, Jung-Hong Ha, WooCheol Lee, Hyeon-Cheol Kim
Three bioceramic sealers (EndoSequence BC sealer, EndoSeal MTA, and MTA Fillapex) and three epoxy resin-based sealers (AH-Plus, AD Seal, and Radic-Sealer) were tested to evaluate the physicochemical properties: flow, final setting time, radiopacity, dimensional stability, and pH change. The one-way ANOVA and Tukey's post hoc test were used to analyze the data (P = 0.05). The MTA Fillapex sealer had a highest flow and the BC Sealer presented a flow significantly lower than the others (P < 0.05). The BC Sealer and MTA Fillapex samples were not set in humid incubator condition even after one month...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28115919/establishment-of-a-method-for-measuring-antioxidant-capacity-in-urine-based-on-oxidation-reduction-potential-and-redox-couple-i2-ki
#14
Tinghui Cao, Min He, Tianyu Bai, Hui Liu
Objectives. To establish a new method for determination of antioxidant capacity of human urine based on the redox couple I2/KI and to evaluate the redox status of healthy and diseased individuals. Methods. The method was based on the linear relationship between oxidation reduction potential (ORP) and logarithm of concentration ratio of I2/KI. ORP of a solution with a known concentration ratio of I2/KI will change when reacted with urine. To determine the accuracy of the method, both vitamin C and urine were reacted separately with I2/KI solution...
2016: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28096759/the-role-of-metals-in-the-reaction-catalyzed-by-metal-ion-independent-bacillary-rnase
#15
Yulia Sokurenko, Vera Ulyanova, Pavel Zelenikhin, Alexey Kolpakov, Dmitriy Blokhin, Dieter Müller, Vladimir Klochkov, Olga Ilinskaya
Extracellular enzymes of intestinal microbiota are the key agents that affect functional activity of the body as they directly interact with epithelial and immune cells. Several species of the Bacillus genus, like Bacillus pumilus, a common producer of extracellular RNase binase, can populate the intestinal microbiome as a colonizing organism. Without involving metal ions as cofactors, binase depolymerizes RNA by cleaving the 3',5'-phosphodiester bond and generates 2',3'-cyclic guanosine phosphates in the first stage of a catalytic reaction...
2016: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28058040/in-vivo-radionuclide-generators-for-diagnostics-and-therapy
#16
REVIEW
Patricia E Edem, Jesper Fonslet, Andreas Kjær, Matthias Herth, Gregory Severin
In vivo radionuclide generators make complex combinations of physical and chemical properties available for medical diagnostics and therapy. Perhaps the best-known in vivo generator is (212)Pb/(212)Bi, which takes advantage of the extended half-life of (212)Pb to execute a targeted delivery of the therapeutic short-lived α-emitter (212)Bi. Often, as in the case of (81)Rb/(81)Kr, chemical changes resulting from the transmutation of the parent are relied upon for diagnostic value. In other instances such as with extended alpha decay chains, chemical changes may lead to unwanted consequences...
2016: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/27965526/fracture-resistance-of-k3-nickel-titanium-files-made-from-different-thermal-treatments
#17
JinWook Choi, Soram Oh, Yu-Chan Kim, Kwang-Koo Jee, KeeYeon Kum, SeokWoo Chang
The purpose of this study was to compare fracture resistances of K3 nickel-titanium files made from different thermal treatments. K3 (SybronEndo, Orange, CA), K3XF (SybronEndo), and experimentally heat treated K3 (K3H) were used. For the cyclic fatigue test, the samples were rotated with up-and-down motion in the artificial canal with the curvature of 60 degrees until the fracture occurred. The number of cycles to fracture (NCF) was measured. For the torsional fracture test, the samples were tightly bound and rotated until the fracture occurred...
2016: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/27965525/facile-synthesis-characterization-and-cytotoxic-activity-of-europium-doped-nanohydroxyapatite
#18
Paulina-Guadalupe Miranda-Meléndez, Gabriel-Alejandro Martínez-Castañón, Nereyda Niño-Martínez, Nuria Patiño-Marín, Miguel-Ángel Casillas-Santana, Brenda-Erendida Castillo-Silva, Facundo Ruiz
The objective of this study was to synthetize europium-doped nanohydroxyapatite using a simple aqueous precipitation method and, thereafter, characterize and impregnate selected samples with 5-fluorouracil in order to explore the properties and the releasing capacity of this material. The nanohydroxyapatite was doped with 3, 5, 10, and 20 wt% of europium. The obtained samples were characterized after they were dried at 80°C and hydrothermal treated at 120°C by 2 hours. The samples were analyzed by transmission electron microscopy, X-ray diffraction analysis, Fourier transform infrared spectroscopy, and photoluminescence...
2016: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/27847444/synthesis-characterization-and-biological-studies-of-a-piperidinyl-appended-dipicolylamine-ligand-and-its-rhenium-tricarbonyl-complex-as-potential-therapeutic-agents-for-human-breast-cancer
#19
Amali Subasinghe, Inoka C Perera, Svetlana Pakhomova, Theshini Perera
A novel ligand bearing a central piperidinyl sulfonamide group, N(SO2pip)dpa, and its corresponding Re tricarbonyl complex, [Re(CO)3(N(SO2pip)dpa)](+), have been synthesized in good yield. The methylene CH2 signal seen as a singlet (4.54 ppm) in a (1)H NMR spectrum of the ligand in DMSO-d6 appears as two doublets (5.39, 5.01 ppm) in a spectrum of the [Re(CO)3(N(SO2pip)dpa)](+) complex and confirms the presence of magnetically nonequivalent protons upon coordination to Re. Structural results revealed that the Re-N bond lengths fall within the normal range establishing coordination of ligand to metal...
2016: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/27833473/synthesis-and-assessment-of-antibacterial-activities-of-ruthenium-iii-mixed-ligand-complexes-containing-1-10-phenanthroline-and-guanide
#20
Atakilt Abebe, Tizazu Hailemariam
In this work, two complexes of ruthenium(III) ([Ru(phen)2Cl2]Cl·2H2O and [Ru(phen)2(G)Cl]2Cl·H2O) were synthesized from 1,10-phenanthroline alone as well as from both 1,10-phenanthroline and guanide. The synthesis was checked using halide test, conductance measurement, and spectroscopic (ICP-OES, FTIR, and UV/Vis) analysis. Their in vitro antibacterial activities were also investigated on two Gram-positive (Staphylococcus aureus (S. aureus) and methicillin resistant Staphylococcus aureus (MRSA)) and two Gram-negative (Escherichia coli (E...
2016: Bioinorganic Chemistry and Applications
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