Antimicrobial activity of metal-substituted cobalt ferrite nanoparticles synthesized by sol–gel technique

Therapeutic and diagnostic potential of nanomaterials for enhanced biomedical applications.

Synthesis and characterization of metals-substituted cobalt ferrite [Mx Co(1-x) Fe2O4; (M = Zn, Cu and Mn; x = 0 and 0.5)] nanoparticles as antimicrobial agents and sensors for Anagrelide determination in biological samples

Antibacterial, antibiofilm, and photocatalytic activities of metals-substituted spinel cobalt ferrite nanoparticles.

Biomolecules-mediated synthesis of selenium nanoparticles using Aspergillus oryzae fermented Lupin extract and gamma radiation for hindering the growth of some multidrug-resistant bacteria and pathogenic fungi.

The synthesis and characterization of silver nanoparticles (AgNPs) using natural pigments from plants as reducing agents is presented in this study. The natural pigments were extracted from Alfalfa leaves. The reduction reaction was investigated by UV–Vis and FTIR analyses. The synthesized AgNPs were characterized by UV–Vis, XRD, TEM, and DLS. UV–Vis analysis revealed that AgNPs were produced with a persistent plasmonic absorption peak at about 418 nm accompanied by consumption of pigments. The reduction is suggested to occur, mainly, by chlorophyll a and carotenes. Characterization revealed pure synthesized AgNPs with an average particle size of 25 nm. In an interesting novel experiment, the progress of reduction reaction was traced at the interface between reacting phases under UV illumination making use of fluorescence of both chlorophylls and formed Ag nano-clusters (AgNCs). The enrollment of chlorophylls in reduction was suggested depending on FTIR and fluorescence analyses. The synthesized AgNPs possessed a superior antimicrobial activity towards Staphylococcus aureus ATCC 29213; 24.0 mm ZOI, followed by Escherichia coli ATCC 25922; 17.0 mm ZOI. In addition, AgNPs were a strong antifungal agent against Candida albicans ATCC 10231; 26.0 mm ZOI.

Synthesis of silver nanoparticles using natural pigments extracted from Alfalfa leaves and its use for antimicrobial activity

A new cationic silver(I)/melamine coordination polymer, [Ag2(melamine)]n2n+: Synthesis, characterization and potential use for aqueous contaminant anion exchange

Buffering-like cationic coordination polymer AgM-CP for adsorptive removal of chromate anions from aqueous solution: Isotherm and thermodynamics

Natural aragonite, NA, (in the form of crushed seashells) has a limited capability to remove Cu(II) from an aqueous solution at ambient temperatures (removal = 22.5% at 25°C). At higher temperature, removal increases (removal = 83.5% at 50°C). Ion exchange is proposed as the mechanism of removal in this case. However, the treatment of NA by 4% NaOH- solution produced Na-modified aragonite, NA-Na, which has higher capability for Cu(II) removal at ambient temperatures (removal = 76% at 25°C). This is practically preferred. X-ray fluorescence of Na-modified aragonite showed presence of Na element on its surface with about 1% which suggests inclusion of Na in the NA lattice structure and this is in agreement with the results of the X-ray diffraction measurements. It is suggested that the modification occurs due to the replacement of some calcium ions by sodium ions over the outer layers of NA lattice, (i.e. facial and sub-facial isomorphous-substitution). This substitution causes deficiency in positive charge...

Hussien Hatem

Papers

Synthesis of silver nanoparticles using natural pigments extracted from Alfalfa leaves and its use for antimicrobial activity

A new cationic silver(I)/melamine coordination polymer, [Ag2(melamine)]n2n+: Synthesis, characterization and potential use for aqueous contaminant anion exchange

Buffering-like cationic coordination polymer AgM-CP for adsorptive removal of chromate anions from aqueous solution: Isotherm and thermodynamics

Alkaline treatment of seashells and its use for the removal of Cu(II) from aqueous solution