Biosynthesized gold nanoparticles-doped hydroxyapatite as antibacterial and antioxidant nanocomposite
Document Type
Article
Publication Date
11-1-2021
Abstract
A composite of hydroxyapatite (HA) doped with green synthesized gold nanoparticles (Au NPs) was prepared. Au NPs were produced via the bioreduction of HAuCl4 with Clitoria ternatea flower extract and utilized in HA synthesis, using Ca(OH)(2) and ammonium diphosphate as precursors. The aim of this research was to analyze the structure of the composite and conduct an antibacterial activity test involving Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, and Streptococcus pyogenes. In addition, antioxidant activity was evaluated by 2,2-diphenyl-1-picrylhydrazyl radical scavenging. Au NP formation monitoring was conducted by UV-visible spectroscopy and particle size analysis, and the synthesized composite was studied using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results revealed homogeneously dispersed Au NPs (particle size ranging from 5 to 80 nm) in the HA structure. The nanocomposite demonstrated enhanced antibacterial activity against the tested bacteria compared to HA, with minimum inhibition concentrations of 3 mu g ml(-1) for E.coli and S.aureus and 10 mu g ml(-1) for K. pneumoniae and S. pyogenes. The nanocomposite expressed antioxidant activity, as shown by 2,2-diphenyl-1-picrylhydrazyl scavenging activities of 66% and 58% at concentrations of 100 mu g ml(-1) and 50 mu g ml(-1), respectively.
Keywords
Au nanoparticles, Hydroxyapatite, Green synthesis, Antibacterial, Antioxidant
Divisions
nanocat
Funders
Kementrian Riset-Badan Riset Nasional, Republic of Indonesia via Hibah Penelitian Dasar Unggulan Perguruan Tinggi[011/DirDPPM/70/DPPM/PDUPT - KEMDIKBUDRISTEK/VII/2021]
Publication Title
Materials Research Express
Volume
8
Issue
11
Publisher
IOP Publishing
Publisher Location
TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND