Synthesis of antibacterial flower‐like silver nanostructures by self‐assembly of diphenylalanine peptide on graphite

Abstract

Preparation of silver nanoflowers (Ag NFs) was carried out through the self-assembly process of diphenylalanine (FF) peptide on the graphite surface. Pencil graphite rods were used as a substrate for the self-assembly process. A reduction reaction by hydrazine was employed in the synthesis procedure of the Ag NFs. scanning electron microscope, Fourier transform infrared spectroscopy (FT-IR) spectroscopy and X-ray diffraction (XRD) were employed to characterise the obtained Ag NFs. The morphological analysis of the Ag NFs revealed assemblies constructed by multiple sheet nanostructures designed as flower petals and positioned in the form of 3D semi-spherical arrangements. The successful synthesis of Ag NFs was confirmed by FT-IR characteristic bands of FF and Ag components. The cubic lattice structure of the Ag NFs was revealed by XRD. Standard Kirby-Bauer disk diffusion tests using Gram-positive and Gram-negative bacterial strains exhibited the promising antibacterial performance of the Ag NFs against all of the tested bacterial species.

Green Synthesis of Flower-Like Carrageenan-Silver Nanoparticles and Elucidation of Its Physicochemical and Antibacterial Properties

“…FTIR spectroscopy was used to elucidate the carrageenan and AgNPs’ chemical functionality and interaction. Figure 2 a shows that the carrageenan had a broad band in the 3200–3400 cm −1 region due to the O-H stretching vibrations [ 31 ]. The peak appearing at ~2900 cm −1 is attributed to the C-H stretching vibrations of methyl groups.…”

“…It has been reported that nanoparticles with novel shapes exhibit optical, electrical, and catalytic properties that are distinct from those of conventional spherical shapes, as well as wider biological and medical applications [ 28 ]. In this regard, numerous studies have focused on creating intricate Ag nanostructures [ 16 , 29 , 30 , 31 , 32 ]. Among them, flower-like AgNPs, also known as Ag nanoflowers, are particularly appealing, as their novel and collective physicochemical properties, which are not visible at the level of individual particles, can be manifested from their anisotropic structure [ 16 ].…”

Morphological studies of self-assembled cyclotides extracted fromViola odorataas novel versatile platforms in biomedical applications

“…The petals typically grew in size by going away from the center exhibiting a 3D flower-like layout due to the concentric circular patterns, which might be attributed to the synergistic noncovalent interactions, such as van der Waals forces, ionic interactions, π-π effects and hydrogen bonding. 32,33 At 37 °C, and pH 4, the cyclotides assembled into micellar structures with a very small size at the first hours. From Fig.…”