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access icon free Green synthesis of silver nanoparticles using flower extract of Malva sylvestris and investigation of their antibacterial activity

© The Institution of Engineering and Technology
Received 19/07/2017, Accepted 04/12/2017, Revised 26/11/2017, Published 07/12/2017

High-quality colloidal silver nanoparticles (AgNP) were synthesised via a green approach by using hydroalcoholic extracts of Malva sylvestris. Silver nitrate was used as a substrate ion while the plant extract successfully played the role of reducing and stabilising agents. The synthesised nanoparticles were carefully characterised by using transmission electron microscopy, atomic-force microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy and UV–vis spectroscopy. The maximum absorption wavelengths of the colloidal solutions synthesised using 70 and 96% ethanol and 100% methanol, as extraction solvents, were 430, 485 and 504 nm, respectively. Interestingly, the size distribution of nanoparticles depended on the used solvent. The best particle size distribution belonged to the nanoparticles synthesised by 70% ethanol extract, which was 20–40 nm. The antibacterial activity of the synthesised nanoparticles was studied on Escherichia coli, Staphylococcus aureus and Streptococcus pyogenes using disk diffusion, minimum inhibitory concentrations and minimum bactericidal concentrations assays. The best antibacterial activity obtained for the AgNPs produced by using 96% ethanolic extract.

Inspec keywords: Fourier transform spectra; atomic force microscopy; antibacterial activity; silver; visible spectra; colloids; X-ray chemical analysis; ultraviolet spectra; particle size; nanomedicine; nanofabrication; biomedical materials; nanoparticles; transmission electron microscopy; microorganisms; infrared spectra

Other keywords: stabilising agents; Malva sylvestris; disk diffusion; colloidal solutions; atomic-force microscopy; ethanolic extract; UV– vis spectroscopy; size 430 nm; Escherichia coli; size 504 nm; size 20 nm to 40 nm; Green synthesis; antibacterial activity; hydroalcoholic extracts; Ag; minimum inhibitory concentrations; Staphylococcus aureus; particle size distribution; high-quality colloidal silver nanoparticles; size 485 nm; minimum bactericidal concentrations assays; reducing agents; Fourier transform infrared spectroscopy; transmission electron microscopy; flower extract; plant extract; energy dispersive X-ray spectroscopy; Streptococcus pyogenes

Subjects: Electromagnetic radiation spectrometry (chemical analysis); Colloids; Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials; Visible and ultraviolet spectra of metals, semimetals, and alloys; Nanotechnology applications in biomedicine; Methods of nanofabrication and processing; Infrared and Raman spectra in metals; Biomedical materials

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