Green synthesis of gold nanoparticles using plant extracts as reducing agents

Abstract

Gold nanoparticles (GNPs) were prepared using four different plant extracts as reducing and stabilizing agents. The extracts were obtained from the following plants: Salvia officinalis , Lippia citriodora , Pelargonium graveolens and Punica granatum . The size distributions of the GNPs were measured using three different methods: dynamic light scattering, nanoparticle-tracking analysis and analysis of scanning electron microscopy images. The three methods yielded similar size distributions. Biocompatibility was examined by correlation of L-cell growth in the presence of different amounts of GNPs. All GNPs showed good biocompatibility and good stability for over 3 weeks. Therefore, they can be used for imaging and drug-delivery applications in the human body. High-resolution transmission electron microscopy was used to view the shapes of the larger GNPs, while infrared spectroscopy was employed to characterize the various functional groups in the organic layer that stabilize the particles. Finally, active ingredients in the plant extract that might be involved in the formation of GNPs are proposed, based on experiments with pure antioxidants that are known to exist in that plant.

Synthesis of Biogenic Gold Nanoparticles from Terminalia mantaly Extracts and the Evaluation of Their In Vitro Cytotoxic Effects in Cancer Cells

“…These temperatures are often used for the synthesis of AuNPs [ 18 ]. The red wine color, which AuNP solutions typically exhibit, is due to the excitation of surface plasmon vibrations in the AuNP solution, and indicates the formation of AuNPs [ 5 , 35 , 37 ]. TM-AuNPs were successfully synthesized with all six extracts at both 25 °C and 70 °C.…”

Nanofibrous cosmetic face mask for transdermal delivery of nano gold: synthesis, characterization, release and zebra fish employed toxicity studies

“…As given in figure 1b, the presence of the characteristic plasmon resonance band [56,57] centred at λ max of 527 nm for the GtAu NPs and 529 nm for the OpAu NPs confirmed the formation of the Au NPs. It is clear that the full width of half maximum (FWHM) of the plasmon peak of OpAu NPs is much wider than that of GtAu NPs, highlighting the increased particle size [58] of the OpAu NPs. A study on different amounts of reducing agents and different reaction temperatures was also carried out to select the optimum conditions for the preparation of the Au NPs (electronic supplementary material).…”

Characteristics and antibacterial activity of green synthesized silver nanoparticles using red spinach (Amaranthus Tricolor L.) leaf extract

“…The basic principle of the synthesis is the capability of flavonoid and alkaloid to reduce metal ion precursor. There are some metal and metal oxide nanoparticles synthesized using plant extract reductor, such as silver nanoparticles (AgNPs) (3), gold nanoparticles (AuNPs) (4,5), zinc oxide (ZnONPs) (6) and platinum nanoparticles (PtNPs) (7). Among these nanoparticles, green synthesis of AgNPs is interesting since many studies reported the characteristics of synthesized nanoparticles as function of kind of plant extract, composition, and method of synthesis (8).…”