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Grafting of multiwalled carbon nanotubes with pyrazole derivatives: characterization, antimicrobial activity and molecular docking study

Authors Metwally NH, Saad GR, Abd El-Wahab EA

Received 5 August 2018

Accepted for publication 26 January 2019

Published 20 August 2019 Volume 2019:14 Pages 6645—6659


Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Govarthanan Muthusamy

Peer reviewer comments 4

Editor who approved publication: Dr Thomas J Webster

Nadia Hanafy Metwally,1 Gamal Riad Saad,1 Esraa Azmy Abd El-Wahab2

1Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt; 2Department of Engineering Mathematics and Physics, Faculty of Engineering Shoubra, Benha University

Correspondence: Nadia Hanafy Metwally
Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt

Introduction: It is well known that the grafted multiwalled carbon nanotubes (MWCNTs) have antibacterial activity and lower cytotoxicity. Moreover, pyrazole derivatives have a broad spectrum of biological activity due to their fertile template for many medicinal drugs. On view of these findings we report herein the hybridization between MWCNTs and some pyrazole derivatives as antibacterial agents.
Materials and methods: Pyrazole and pyrazolone derivatives were grafted onto the surface of carboxylated MWCNTs via the reaction of carboxylated MWCNTs and the diazonium salts of pyrazoles and pyrazolones using mixed acid treatment. The insertion of the pyrazole and pyrazolone moieties was characterized by Fourier transform infrared (FTIR) spectroscopy, energy dispersion spectroscopy, transmission electron microscopy, X-ray diffraction and thermogravimetric (TGA).
Results: The results indicate that pyrazole and pyrazolone moieties successfully attached on carboxylated MWCNTs surface. The neat pyrazole and pyrazolone derivatives and their corresponding carbon nanotubes were tested against Staphylococcus aureus, Bacillus subtilus, Escherichia coli, and Candida albicans bacteria, and Aspergillusniger fungi. The results showed that the grafted carbon nanotubes of pyrazole and pyrazolone derivatives have better antimicrobial activity than the neat pyrazole and pyrazolone derivatives. The molecular docking studies were performed on the most potent antimicrobial compounds to investigate the existence of the interactions between the most active inhibitors and Farnesyl pyrophosphate synthase (FPPS).
Conclusion: The surface of the carboxylated MWCNTs was successfully grafted with some pyrazole derivatives. The antibacterial activity was investigated for the newly synthesized compounds and indicated that the grafted MWCNTs have good antibacterial activity toward some pathogenic types of bacteria.

Keywords: carbon nanotubes, pyrazoles, pyrazolones, grafting, antimicrobial activity, zeta-potential, molecular docking study

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