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Antimicrobial activity of CdS and Ag2S quantum dots immobilized on poly(amidoamine) grafted carbon nanotubes.
- Source :
-
Colloids and surfaces. B, Biointerfaces [Colloids Surf B Biointerfaces] 2012 Dec 01; Vol. 100, pp. 215-21. Date of Electronic Publication: 2012 May 18. - Publication Year :
- 2012
-
Abstract
- Herein we report the design of antimicrobial nanohybrids, f-MWCNTs-CdS and f-MWCNTs-Ag(2)S developed by covalent grafting of cationic hyperbranched dendritic polyamidoamine (PAMAM) onto multiwalled carbon nanotubes (MWCNTs) and successive deposition of CdS and Ag(2)S quantum dots (QDs). The CdS and Ag(2)S QDs were in situ deposited on PAMAM grafted MWCNTs instead of anchoring the pre-synthesized QDs. The fourth generation, amine terminated hyperbranched PAMAM was grafted on MWCNTs, which was achieved through repetitive reactions of Michael addition of methylmethacrylate to the surface amino groups and amidation of terminal ester groups with ethylenediamine. The covalent grafting of PAMAM onto MWCNTs and the consecutive conjugation of CdS and Ag(2)S QDs were characterized using Fourier transform infrared spectroscopy, elemental analysis, powder X-ray diffraction, Raman spectroscopy, transmission electron microscopy and energy dispersive spectroscopy. The antibacterial activity of f-MWCNTs-CdS and f-MWCNTs-Ag(2)S nanohybrids was evaluated against Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus and the results were compared with the activity of carboxylated MWCNTs, PAMAM grafted MWCNTs, PAMAM dendrimer, and CdS and Ag(2)S QDs. It was found that the germicidal action of MWCNTs was enhanced by grafting of PAMAM, which was further improved with immobilization of CdS and Ag(2)S QDs.<br /> (Published by Elsevier B.V.)
- Subjects :
- Cadmium Compounds chemistry
Dendrimers chemistry
Escherichia coli drug effects
Escherichia coli growth & development
Ethylenediamines chemistry
Methylmethacrylates chemistry
Microscopy, Electron, Transmission
Nanotubes, Carbon ultrastructure
Pseudomonas aeruginosa drug effects
Pseudomonas aeruginosa growth & development
Silver Compounds chemistry
Spectroscopy, Fourier Transform Infrared
Spectrum Analysis, Raman
Staphylococcus aureus drug effects
Staphylococcus aureus growth & development
Sulfides chemistry
X-Ray Diffraction
Anti-Bacterial Agents chemical synthesis
Anti-Bacterial Agents pharmacology
Nanotubes, Carbon chemistry
Polyamines chemistry
Quantum Dots
Subjects
Details
- Language :
- English
- ISSN :
- 1873-4367
- Volume :
- 100
- Database :
- MEDLINE
- Journal :
- Colloids and surfaces. B, Biointerfaces
- Publication Type :
- Academic Journal
- Accession number :
- 22766300
- Full Text :
- https://doi.org/10.1016/j.colsurfb.2012.05.012