scholarly journals Preparation of ferrocene core dendrimers and immobilization of AChE for detection of diclofop-methyl herbicide

2019 ◽  
Vol 38 (2) ◽  
pp. 215 ◽  
Author(s):  
Nurdan Kurnaz Yetim ◽  
Nurşen Sari
Keyword(s):  
Magnetic Susceptibility ◽  
1H Nmr ◽  
Substrate Concentration ◽  
Storage Stability ◽  
Molar Conductivity ◽  
Acetylcholine Esterase ◽  
The Novel ◽  
Optimal Parameters ◽  
Repeated Use ◽  
Inhibition Reaction

The aim of this work was to investigate diclofop-methyl detection (found in a variety of herbicides) using novel dendrimers that have ferrocene cores, as well as their Pt(II) and Pt(IV) complexes. Novel dendrimer structures were synthesized and characterized by molar conductivity, magnetic susceptibility, FTIR, UV-Vis, 1H-NMR and LC-MS methods. Then, the AChE (acetylcholine esterase) enzyme was immobilized on the novel dendrimers, and the optimal parameters (pH, temperature, repeated use, storage stability, substrate concentration) were determined for immobilized AChE. Lastly, changes in absorbance intensity were measured, and calibration graphs were plotted that reflect the inhibition reaction of immobilized AChE with diclofop-methyl. The inhibition interaction of the enzyme immobilized to the Pt(II) ion containing dendrimers was higher than that of the Pt(IV) ion containing dendrimers.

scholarly journals Preparation and Spectral Study of New Complexes of Some Metal Ions with 3,5-Dimethyl-1H-Pyrazol-1-yl Phenyl Methanone

2011 ◽  
Vol 8 (4) ◽  
pp. 1005-1011
Author(s):  
Baghdad Science Journal
Keyword(s):  
Magnetic Susceptibility ◽  
Elemental Analysis ◽  
Room Temperature ◽  
Molar Conductivity ◽  
The Other ◽  
Octahedral Structure ◽  
Tetrahedral Structure ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible

Many complexes of 3,5-dimethyl-1H-pyrazol-1-yl phenyl methanone with Cr(III), Co(II), Ni(II), Cu(II) and Cd(II) were synthesized and characterized by FT-IR, UV/visible spectra, elemental analysis, room temperature magnetic susceptibility and molar conductivity. Cd(II) complex was expected to have tetrahedral structure while all the other complexes were expected to have an octahedral structure.

Facile Synthetic Protocols for the preparation of New Impurities in Pemetrexed Disodium Heptahydrate as an Anti-Cancer Drug

2021 ◽  
Vol 18 ◽  
Author(s):  
Rama Mohana Reddy Jaggavarapu ◽  
Venkatanarayana Muvvala ◽  
Ghojala Venkatareddy ◽  
Ravi Kumar Cheedarala
Keyword(s):  
Quality Control ◽  
Spectral Analysis ◽  
1H Nmr ◽  
Structure Elucidation ◽  
Research Work ◽  
Synthetic Methods ◽  
Cancer Drug ◽  
The Novel ◽  
Anti Cancer ◽  
Pemetrexed Disodium

: A facile synthetic protocols were employed to prepare process-related impurities associated with the synthesis of pemetrexed disodium heptahydrate, Alimta. The research work is described for the development of the novel synthetic methods and their structure elucidation of Pemetrexed glutamide, N-methyl pemetrexed, and N-methyl pemetrexed glutamide impurities. The listed impurities were deduced through spectral analysis such as 1H-NMR, 13CNMR, and HRMS. The target compounds can be used as the reference substances for the quality control.

Laccase Biosensor Based on Ag-Doped TiO2 Nanoparticles on CuCNFs for the Determination of Hydroquinone

NANO ◽  
2016 ◽  
Vol 11 (12) ◽  
pp. 1650132 ◽  
Author(s):  
Jie Yang ◽  
Dawei Li ◽  
Zengyuan Pang ◽  
Qufu Wei
Keyword(s):  
Electron Microscopy ◽  
Storage Stability ◽  
Electrochemical Impedance ◽  
The Novel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
New Material ◽  
And Storage

A novel nanomaterial composed of copper and carbon nanofibers (CuCNFs) decorated with Ag-doped TiO2 (Ag–TiO[Formula: see text] nanoparticles was prepared through electrospinning, carbonization and solvothermal treatment. The composites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy (EIS). The obtained composites were mixed with laccase and Nafion to construct novel hydroquinone biosensor. The electrochemical behavior of the novel biosensor was studied using cyclic voltammetry (CV) and chronoamperometry. The results demonstrated that the biosensor possessed a wide detection linear range (1.20–176.50[Formula: see text][Formula: see text]M), a good selectivity, repeatability, reproducibility and storage stability. This work provides a new material to design more efficient laccase (Lac) based biosensor for hydroquinone detection.

Crystal Structure and Magnetic Properties of the Novel Hollandite Ba1.3Co1.3Ti6.7O16

2011 ◽  
Vol 66 (11) ◽  
pp. 1097-1100 ◽  
Author(s):  
Larysa Shlyk ◽  
Rainer Niewa
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Single Crystals ◽  
Magnetic Moment ◽  
High Spin State ◽  
The Novel ◽  
Charge Balance ◽  
Vertex Sharing ◽  
State Spin

Single crystals of the new barium hollandite Ba1.3Co1.3Ti6.7O16 were obtained from a BaCl2 flux (I2/m, Z = 1, a = 9.9470(4), b = 2.9714(2), c = 10.2260(5) Å , β = 90.906(2)◦). In the crystal structure piles of Ba atoms are situated within a framework of edge- and vertex-sharing octahedra (Co,Ti)O6. The composition was deduced from microprobe analyses, structure refinements and charge balance arguments in agreement with the observed magnetic properties. The temperature dependence of the magnetic susceptibility χ(T) of Ba1.3Co1.3Ti6.7O16 single crystals reveals paramagnetism down to 2 K. The value of the Co magnetic moment deduced from the Curie-Weiss law agrees well with the theoretical value of the high-spin state spin-only moment of μeff = 3.87 μB for Co2+ (S = 3/2)

Magnetite Formation by the Novel Fe(III)-reducingGeothrix fermentansStrain HradG1 Isolated from a Hydrocarbon-Contaminated Sediment with Increased Magnetic Susceptibility

2013 ◽  
Vol 30 (10) ◽  
pp. 863-873 ◽  
Author(s):  
Nicole Klueglein ◽  
Tina Lösekann-Behrens ◽  
Martin Obst ◽  
Sebastian Behrens ◽  
Erwin Appel ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
The Novel ◽  
Contaminated Sediment ◽  
Magnetite Formation

scholarly journals FIRST-ROW TRANSITION METAL COMPLEXES OF OMEPRAZOLE AS ANTI-ULCERATIVE DRUGS

2010 ◽  
Vol 10 (3) ◽  
pp. 382-389
Author(s):  
Suman Malik ◽  
Supriya Das ◽  
Bharti Jain
Keyword(s):  
Magnetic Susceptibility ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Analytical Data ◽  
Transition Metal Ions ◽  
Molar Conductivity ◽  
Spectral Studies ◽  
Antibacterial And Antifungal Activities ◽  
Antibacterial And Antifungal

Omeprazole (OME) is a proton pump inhibitor (PPI). PPIs have enabled to improve the treatment of various acid-peptic disorders. OME is a weak base and it can form several complexes with transition and non-transition metal ions. In the present paper, we are describing series of transition metal complexes of omeprazole i.e., 5-methoxy-2[(4methoxy-3, 5dimethyl-2-pyridinyl) methylsulfinyl]-1H-benzimidazole with CuII, MnII, CoII, NiII, FeII, ZnII and HgII. These complexes were characterized by elemental analysis, molar conductivity, IR, NMR, magnetic susceptibility, UV-visible spectral studies, ESR, SEM and X-ray diffraction. Based on the above studies, the ligand behaves as bidentate O, N donor and forms coordinate bonds through C=N and S=O groups. The complexes were found to non-electrolytic in nature on the basis of low values of molar conductivity. Analytical data and stoichiometry analysis suggest ligand to metal ratio of 2:1 for all the complexes. Electronic spectra and magnetic susceptibility measurements reveal octahedral geometry for Mn(II),Co(II), Ni(II),Fe(II) and Cu(II) complexes and tetrahedral for Hg(II) and Zn(II) complexes. Ligands and their metal complexes have been screened for their antibacterial and antifungal activities against bacteria Pseudomonas, Staphylococcus aureus and fungi Aspergillus niger and A. flavous.

scholarly journals A facile synthesis, dynamic 1H NMR and theoretical study the novel stable heterocyclic phosphorus ylides containing tetrazole

ARKIVOC ◽  
2009 ◽  
Vol 2008 (17) ◽  
pp. 173-183
Author(s):  
M. Amin Kazemian ◽  
Mahmoud Nassiri ◽  
Ali Ebrahimi ◽  
M. Taher Maghsoodlou ◽  
S. Mostafa Habibi-Khorassani ◽  
...  
Keyword(s):  
1H Nmr ◽  
Theoretical Study ◽  
The Novel ◽  
Phosphorus Ylides ◽  
Facile Synthesis ◽  
Dynamic 1H Nmr

scholarly journals Synthesis, Characterization and Antimicrobial Evaluation of Mn(II) and Zn(II) Schiff base Complexes with p-hydroxypropiophenone moiety

2019 ◽  
Vol 1 ◽  
pp. 202-208
Author(s):  
S A Agbese ◽  
G A Shallangwa ◽  
S O Idris
Keyword(s):  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Metal Complexes ◽  
Biological Activities ◽  
Electronic Spectroscopy ◽  
Conductivity Measurement ◽  
Molar Conductivity ◽  
Schiff Base Complexes ◽  
Significant Activity ◽  
Imine Bond

The Schiff base was synthesized by condensing 4-aminopyridine with 4-hydroxypropiophenone. The synthesized ligand was characterized by proton and carbon-13 NMR spectroscopy, electronic spectroscopy and FTIR.The result of the FTIR showed the presence of a band at 1643.41cm-1 assigned to the azomethine bond, also the result of the 1HNMR and 13CNMR gave credence to the successful synthesis of the Schiff base. The Mn(II) and Zn(II) complexes were characterized by UV-visible analysis, FTIR, molar conductivity measurement and magnetic susceptibility test. The results of the FTIR suggest that the metal complexes possess coordinated water molecules and the shift in the wavenumber of the azomethine linkage in the spectra of the complexes shows that the nitrogen of the imine bond participated in the coordination to the metal centre. The magnetic susceptibility measurement shows that the metal complexes possess octahedral geometry. The molar conductivity test shows that the complexes are nonelectrolytic in nature and the metal to ligand ratio is 1:2. The synthesized ligand and the metal complexes were evaluated for biological activities against some organisms. The Zn(II) complex showed significant activity against the test organisms.

scholarly journals An accomplished procedure of horseradish peroxidase immobilization for removal of acid yellow 11 in aqueous solutions

2020 ◽  
Vol 81 (12) ◽  
pp. 2664-2673 ◽  
Author(s):  
Melda Altikatoglu Yapaoz ◽  
Azade Attar
Keyword(s):  
Horseradish Peroxidase ◽  
Storage Stability ◽  
Dye Degradation ◽  
Residual Activity ◽  
Immobilized Enzymes ◽  
The Novel ◽  
Optimum Temperature ◽  
Short Term ◽  
Waste Effluents ◽  
The Stability

Abstract Horseradish peroxidase (HRP) characteristics were improved by two techniques, Na-alginate entrapment and glutaraldehyde crosslinking prior to alginate entrapment, in order to enhance the stability, functionality and removal of dyes in waste water. Free, entrapped and crosslinked-entrapped enzymes were compared by activity assays, which indicated the optimum temperature is 25 °C and pH 4.0–5.0. Kinetics results showed that alginate entrapment and crosslinking prior to entrapment increased Vmax and did not cause any significant decrease in Km. The thermal resistance of the free enzyme was short-term, zero residual activity after 250 min, while the immobilized enzymes preserved more than 50% of their activity for 5 h at 60 °C. Immobilized HRP was resistant to methanol, ethanol, DMSO and THF. The storage stability of free HRP ended in 35 days whereas entrapped and crosslinked-entrapped HRPs had 87 and 92% residual activity at the 60th day, respectively. HRP was used in the decolorization of azo dye Acid yellow 11 and total decolorization (>99%) was obtained using crosslinked-entrapped HRP. Reusability studies presented the improvement that crosslinked-entrapped HRP reached 74% decolorization after 10 batches. The results demonstrated that the novel immobilized HRP can be used as an effective catalyst for dye degradation of industrial waste effluents.

Synthesis of [Mn(Salen)Cl] Complex Compound and Superoxide Dismutase Activity Determination through Non-Enzymatic Method

2019 ◽  
Vol 811 ◽  
pp. 22-27 ◽  
Author(s):  
Yusi Deawati ◽  
Djulia Onggo ◽  
Irma Mulyani ◽  
Iwan Hastiawan ◽  
Ratna Annisa Utami ◽  
...  
Keyword(s):  
Superoxide Dismutase ◽  
Magnetic Susceptibility ◽  
Complex Compound ◽  
Ionic Species ◽  
Molar Conductivity ◽  
Enzymatic Method ◽  
Conductivity Measurements ◽  
Sod Activity ◽  
Very High

Superoxide dismutase (SOD) is an Mn-containing enzyme that catalyzes the conversion of superoxide (O2•−) into O2and H2O2. To develop a small, non-protein Mn-containing SOD mimic, an [Mn(salen)Cl] complex was synthesized from MnCl2.4H2O and H2salen. The product yielded 75-90% reddish dark brown crystals indicative of the presence of manganese(III) metal ions. An elemental analysis showed that the compound contained: C = 48.36%; H = 4.34%; and N = 7.13%. Infrared spectra of this compound showed peaks at: υ(OH)=3426 (medium), υ(C=N)=1634 (very high), υ(CO)=1292 (high). An ESI-MS analysis (m/z) showed the presence of ionic species from the complex including (salen)(H+) = 269.0 and [Mn(salen)]+= 320.9. Conductivity measurements revealed that the compound is neutral with a molar conductivity of 0.17 mS. Its magnetic moment of 5.2 BM was obtained from a magnetic susceptibility balance measurement, showing that the compound is paramagnetic. The SOD activity of this compound was given by IC50= 2.5 ± 0.3 µM in a non-enzymatic riboflavin photoreductionin vitrotest.

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