X-ray, FT-IR, NMR and PM5 structural studies and antibacterial activity of unexpectedly stable salinomycin–benzotriazole intermediate ester

2012 ◽  
Vol 1022 ◽  
pp. 197-203 ◽  
Author(s):  
Adam Huczyński ◽  
Jan Janczak ◽  
Michał Antoszczak ◽  
Joanna Stefańska ◽  
Bogumil Brzezinski
Keyword(s):  
Antibacterial Activity ◽  
Structural Studies ◽  
X Ray ◽  
Ft Ir

Nitroxide radicals appended to phthalonitriles: synthesis, structural characterization and photophysical properties

2021 ◽  
Vol 77 (3) ◽  
pp. 137-143
Author(s):  
Ismail Fidan ◽  
Emel Onal ◽  
Catherine Hirel
Keyword(s):  
Magnetic Measurements ◽  
Photophysical Properties ◽  
Nucleophilic Aromatic Substitution ◽  
Structural Studies ◽  
Aromatic Substitution ◽  
Nitronyl Nitroxide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted ◽  
Ft Ir

The syntheses of 4-[4-(4,4,5,5-tetramethyl-2-imidazoline-3-oxide-1-oxyl-2-yl)phenoxy]phthalonitrile (3, C21H19N4O3) and 4-[4-(4,4,5,5-tetramethyl-2-imidazoline-1-oxyl-2-yl)phenoxy]phthalonitrile (4) were carried out by microwave-assisted nucleophilic aromatic substitution of 4-nitrophthalonitrile (2) by the pre-formed 2-(4-hydroxyphenyl)-4,4,5,5-tetramethyl-2-imidazoline-3-oxide-1-oxyl (1). Compounds 3 and 4 were characterized unambiguously by a rich array of analyses, such as melting point, FT–IR, MALDI–TOF MS, elemental analysis, UV–Vis, CV, EPR, magnetic measurements and single-crystal X-ray diffraction. Structural studies demonstrate that the C—H...X and C—X...π (X = O and N) interactions in the radical nitronyl nitroxide groups play an important role in the assembly of the crystal structures. Moreover, cyclic voltammetry analyses show that the phthalonitrile substituent retains the redox properties of the Ullman radicals.

X-ray crystallographic, FT-IR and NMR studies as well as anticancer and antibacterial activity of the salt formed between ionophore antibiotic Lasalocid acid and amines

2013 ◽  
Vol 1032 ◽  
pp. 69-77 ◽  
Author(s):  
Adam Huczyński ◽  
Jacek Rutkowski ◽  
Joanna Wietrzyk ◽  
Joanna Stefańska ◽  
Ewa Maj ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Nmr Studies ◽  
X Ray ◽  
Ft Ir

scholarly journals Extraction of Hydroxyapatite from Caprine Bones and its Anti-Bacterial Study

2021 ◽  
Vol 40 (4) ◽  
pp. 867-873
Author(s):  
Mujeeb Ur Rehman Rehman ◽  
Ayatullah Qureshi ◽  
Muhammad Moazam Baloch
Keyword(s):  
Antibacterial Activity ◽  
Milling Process ◽  
X Ray Diffraction ◽  
Zone Of Inhibition ◽  
X Ray ◽  
Bacterial Response ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Inorganic Substances ◽  
Animal Bones ◽  
Ft Ir

Bones are mineralized connecting tissues consisting of 70% of Hydroxyapatite (HAP); it is the major component of the bone. Hydroxyapatite (HAP) is most important biomaterial possessing all distinguish features such as antibacterial activity, bioactive and non-inflammatory behavior. Hydroxyapatite is mainly synthesized by two routes i.e. i) using inorganic substances and ii) by exploiting natural sources. The aim of this study is to extract hydroxyapatite using solid waste (animal bones) and to investigate its antibacterial activity. The extraction consisted of alkaline technique and calcination methods. During alkaline process bones became very soft and were easily converted into powder using mortar and pestle without utilizing any milling process and anti-bacterial response was higher when compared to previous studies. The characterization techniques that were utilized are; X-Ray Diffraction (XRD), Fourier Transformed Infrared Spectroscopy (FT-IR) and SEM (Scanning Electron Microscopy (SEM) in order to reveal phase composition, functional groups and surface morphology of HAP. Antibacterial activity was checked by zone of inhibition

X-ray Diffraction, FT-IR, and13C CP/MAS NMR Structural Studies of Solvated and Desolvated C-Methylcalix[4]resorcinarene

2010 ◽  
Vol 114 (32) ◽  
pp. 10311-10320 ◽  
Author(s):  
Rafal Kuzmicz ◽  
Violetta Kowalska ◽  
Sławomir Domagała ◽  
Marcin Stachowicz ◽  
Krzysztof Woźniak ◽  
...  
Keyword(s):  
Mas Nmr ◽  
Structural Studies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Cp Mas Nmr

scholarly journals CuO NANOPARTICLES: SYNTHESIS, CHARACTERIZATION AND THEIR BACTERICIDAL EFFICACY

2017 ◽  
Vol 9 (6) ◽  
pp. 71 ◽  
Author(s):  
Manyasree D ◽  
Kiran Mayi Peddi ◽  
Ravikumar R
Keyword(s):  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Copper Oxide ◽  
Cuo Nanoparticles ◽  
Proteus Vulgaris ◽  
X Ray Diffraction ◽  
Gram Positive ◽  
Gram Negative ◽  
X Ray ◽  
Ft Ir

Objective: In the present study copper oxide (CuO) nanoparticles were synthesized and characterized. The antibacterial activity of CuO nanoparticles was carried out against Escherichia coli, Proteus vulgaris, Staphylococcus aureus and Streptococcus mutans.Methods: The synthesis was carried out by coprecipitation method using copper sulfate and sodium hydroxide as precursors. The synthesized copper oxide nanoparticles were characterized by using X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FT-IR), UV-vis spectroscopy and scanning electron microscope (SEM) with Energy Dispersive X-ray Analysis (EDX) techniques. Besides, this study determines the antibacterial activity and minimum inhibitory concentration (MIC) of CuO nanoparticles against gram-positive (Staphylococcus aureus and Streptococcus mutans) and gram-negative (E. coli and Proteus vulgaris) bacteria.Results: The average crystallite size of CuO nanoparticles was found to be 19 nm by X-ray diffraction. FT-IR spectrum exhibited vibrational modes at 432 cm-1, 511 cm-1 and 611 cm-1were assigned for Cu-O stretching vibration. According to UV-Vis spectrum, two bands were observed at 402 nm and 422 nm. ED’s spectrum shows only elemental copper (Cu) and oxide (O) and no other elemental impurity was observed. The antimicrobial assay revealed that Proteus vulgaris showed a maximum zone of inhibition (37 mm) at 50 mg/ml concentration of CuO nanoparticles.Conclusion: In conclusion, copper oxide is a good antibacterial agent against both gram positive and gram-negative organisms.

scholarly journals Biological synthesis of AgNPs BIOLOGICAL SYNTHESIS OF SILVER NANOPARTICLES USING THE TUBEROUS ROOT EXTRACT OF IPOMOEA BATATAS AND THEIR CHARACTERIZATIONS AND ANTIBACTERIAL ACTIVITY

2019 ◽  
pp. 300-303 ◽  
Author(s):  
NAVEEN CHANDRA JOSHI ◽  
JUHI CHHABRA
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Ipomoea Batatas ◽  
Tuberous Root ◽  
Biological Synthesis ◽  
Root Extract ◽  
X Ray ◽  
Zones Of Inhibition ◽  
Ft Ir ◽  
Uv Visible

Objectives: Tuberous root extract based synthesis of silver nanoparticles (AgNPs), characterizations using Fourier-transform infrared spectroscopy (FT-IR), UV-visible, powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) techniques, and antibacterial activity of AgNPs against Staphylococcus aureus, Staphylococcus mutans, Proteus vulgaris, and Escherichia coli. Methods: Root extract of Ipomoea batatas (sweet potato) was prepared by boiling of small cut pieces of root with double distilled water. Added root extract with silver nitrate solution and centrifuged and collect the pellets. After several washing and drying, AgNPs have been preserved for characterizations and antibacterial activity. Results: The synthesized AgNPs were well characterized by FT-IR, UV-visible, XRD, FESEM, and EDX methods, and significant zones of inhibition observed around the loaded AgNPs on the agar plates. The zones of inhibition have been achieved 36, 40, 46, and 32 mm for E. coli, P. vulgaris, S. mutans, and S. aureus. Conclusion: The characterisation methods such as UV-Visible, FTIR, Powder XRD, FESEM and EDX indicate an efficient formation of AgNPs using root extract of I. batatas. The biologically synthesized AgNPs are found good antibacterial agents.

scholarly journals SYNTHESIS, CHARACTERIZATION AND ANTIBACTERIAL ACTIVITY OF ALUMINIUM OXIDE NANOPARTICLES

2018 ◽  
Vol 10 (1) ◽  
pp. 32 ◽  
Author(s):  
Manyasree D. ◽  
Kiranmayi P. ◽  
Ravi Kumar R. V. S. S. N.
Keyword(s):  
Antibacterial Activity ◽  
Aluminium Oxide ◽  
Al2o3 Nanoparticles ◽  
X Ray Diffraction ◽  
Gram Positive ◽  
Gram Negative ◽  
X Ray ◽  
Ft Ir ◽  
Gram Negative Organisms ◽  
Aluminium Oxide Nanoparticles

Objective: In the present study, synthesized alumina (Al2O3) nanoparticles were characterized and their antibacterial activity against gram positive and gram negative organisms were studied.Methods: The synthesis was carried out by coprecipitation method using aluminium sulfate and NaOH as precursors. The synthesized aluminium oxide nanoparticles were characterized by using X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) with Energy Dispersive X-ray Analysis (EDX) techniques. Besides, this study determines the antibacterial activity and minimum inhibitory concentration (MIC) of Al2O3 nanoparticles against gram-positive (Staphylococcus aureus and Streptococcus mutans) and gram-negative (E. coli and Proteus vulgaris) bacteria. Results: The average crystallite size of Al2O3 nanoparticles was found to be 35 nm by X-ray diffraction. FT-IR spectrum exhibited the peaks at 615 and 636 were assigned to the aluminium oxide stretching. The EDX measurements indicated the presence of Al along with O peaks. It indicates the purity of the sample. The antimicrobial assay revealed that E. coli showed a maximum zone of inhibition (39 mm) at 50 mg/ml concentration of Al2O3 nanoparticles.Conclusion: In conclusion, aluminium oxide is a good antibacterial agent against both gram positive and gram-negative organisms.

scholarly journals Ultrasound assisted green synthesis of cerium oxide nanoparticles using Prosopis juliflora leaf extract and their structural, optical and antibacterial properties

2018 ◽  
Vol 35 (4) ◽  
pp. 791-798 ◽  
Author(s):  
Thirunavukkarasu Arunachalam ◽  
Muthukumaran Karpagasundaram ◽  
Nithya Rajarathinam
Keyword(s):  
Particle Size ◽  
Antibacterial Activity ◽  
Cerium Oxide ◽  
Leaf Extract ◽  
Prosopis Juliflora ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
X Ray ◽  
Ft Ir ◽  
Ultrasound Assisted

Abstract Cerium oxide nanoparticles (CONPs) were prepared using ultrasound assisted leaf extract of Prosopis juliflora acting as a reducing as well as stabilizing agent. The synthesized CONPs were characterized by ultraviolet-visible absorption spectroscopy (UV-Vis), particle size analyzer (PSA), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTEM). From the UV-Vis analysis, the optical band gap of the prepared CONPs (Eg = 3.62 eV) was slightly increased as compared to the bulk ceria (Eg = 3.19 eV). The phytochemicals in the extract reduced the particle size to 3.7 nm ± 0.3 nm, as it is evident from the PSA. FT-IR results confirmed the Ce-O stretching bands by showing the peaks at 452 cm-1. The Raman spectrumshowed a characteristic peak shift for CONPs at 461.2 cm-1. XRD analysis revealed the cubic fluorite structure of the synthesizednanoparticles with the lattice constant, a of 5.415 Å and unit cell volume, V of 158.813 Å3. XPS signals were used to determine the concentration of Ce3+ and Ce4+ in the prepared CONPs and it was found that major amount of cerium exist in the Ce4+ state. HRTEM images showed spherical shaped particles with an average size of 15 nm. Furthermore, the antibacterial activity of the prepared CONPs was evaluated and their efficacies were compared with the conventional antibiotics using disc diffusion assay against a set of Gram positive (G+) bacteria (Staphylococcus aureus, Streptococcus pneumonia) and Gram negative (G-) bacteria (Pseudomonas aeruginosa, Proteus vulgaris). The results suggested that CONPs showed antibacterial activity with significant variations due to the differences in the membrane structure and cell wall composition among the two groups tested.

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