Functionalization of Mesoporous CuS@mSiO2 Core-Shell Nanoparticles by Cu(II) and Ni(II) Schiff Base Complexes: Synthesis, Characterization, Antibacterial Activity, Antibiotic Loading, DNA Cleavage and Enzyme Immobilization

Document Type : Research Paper

Authors

1 Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran

2 Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran

3 Biotechnology and Biological Science Research Center, Shahid Chamran University of Ahvaz, Ahvaz, Iran

Abstract

3-Chloropropyltrimethoxysilane (CPTMS) was grafted on the surface of mesoporous CuS@mSiO2 core-shell nanoparticles and then condensed with a tetradentate Schiff base, bis(salicylaldehyde)diethylenetriamine (H2Saldien), to obtain CuS@mSiO2-SB. The latter material was treated with Cu(II) or Ni(II) acetate salts and therefore metal Schiff base complexes were immobilized on mesoporous nanocomposites, CuS@mSiO2-SB-Cu and CuS@mSiO2-SB-Ni. The characterization of synthesized nanomaterials was carried out by Fourier-transform infrared spectroscopy (FT-IR), energy dispersive X-ray analysis (EDX), field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), low angle X-Ray diffraction (LA-XRD), Brunauer–Emmett–Teller (BET) surface area analysis, and thermogravimetric analysis (TGA). The results confirm a core-shell mesoporous structure for nanocomposites and prove the presence of all elements. Nanoparticles have spherical morphology with a mean diameter less than 100 nm. The synthesized nanocomposites were evaluated for antibacterial activity against Gram-positive (S. aureus) and Gram-negative (P. aeruginosa) bacteria and as carrier for streptomycin, gentamycin and polymyxin. The DNA cleavage activity of nanoparticles was also studied by agarose gel electrophoresis method. Nanocomposites were found to be good carrier for antibiotic, significantly inhibit bacterial growth and completely degrade the treated DNA. Also nanoparticles efficiently immobilized a-amylase enzyme.

Graphical Abstract

Functionalization of Mesoporous CuS@mSiO2 Core-Shell Nanoparticles by Cu(II) and Ni(II) Schiff Base Complexes: Synthesis, Characterization, Antibacterial Activity, Antibiotic Loading, DNA Cleavage and Enzyme Immobilization

Keywords

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Inorganic Chemistry Research
Volume 6, Issue 2
December 2022
Pages 98-106

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History

  • Receive Date: 17 September 2022
  • Revise Date: 24 October 2022
  • Accept Date: 25 October 2022

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