Phytosynthesis of colloidal nanosilver from Mentha longifolia and Mentha arvensis: Comparative morphological and optical characterization

Abstract

The present study involves an ecofriendly strategy for the reduction of bulk silver into its nanoforms by using the aqueous extracts of Mentha longifolia leaves (MLL), M. longifolia branches (MLB), and Mentha arvensis (MA). Synthesis of silver nanoparticles (AgNPs) was confirmed initially by observing a change in the color of the reaction mixture followed by measuring the absorbance, and a characteristic surface plasmon resonance band was observed between 400 and 500 nm of the λ of light. Morphological and optical characterization techniques of AgNPs were performed by using UV-visible spectrophotometer, scanning electron microscopy, atomic force microscopy, energy-dispersive X-ray spectroscopy (EDX), and dynamic light scattering (DLS) analysis. It was confirmed that the phytosynthesized nanoparticles are anisotropic and nearly spherical having a size smaller than 100 nm while some cubical and prismatic nanostructures were also observed. The average size of a single nanoparticle measured by DLS analysis was reported 10.50 nm, 15.55 nm, and 20.46 nm biofabricated by using MLB, MLL, and MA extract, respectively. The EDX analysis reported the presence of elemental Ag while elemental O was also observed in MLL and MLB AgNPs. The results from these experiments endorse the potential of reported plant species to phytosynthesize AgNPs. The future applications of this work involve the utilization of AgNPs for multiple biological applications.

Titanium dioxide nanoparticles elicited agro-morphological and physicochemical modifications in wheat plants to control Bipolaris sorokiniana

“…The bio-fabrication of nanoparticles has advantages over the routine physical and chemical methods of synthesis. The phyto-reduction of metal salt results in the synthesis of biologically active nanomaterials that have many biological and medical applications [9].…”

“…The use of modern technologies can be exploited to limit harmful agrochemicals [8]. Nanotechnology can play a vital role in dealing with these problems [9][10][11]. Recently, titanium dioxide (TiO 2 ) has extensively been used as an environment friendly and clean photocatalyst due to its optical characteristics, chemical stability and non-toxic nature [12][13][14].…”

“…Bio-fabrication of nanoparticles by using the reducing abilities of the plant secondary metabolites has advantages to generate functional nanoparticles to treat microbial resistance [17,22]. It has advantages to provide ecofriendly synthesis procedure, inexpensive reactants and the fabrication of biocompatible nanomaterials [8,9,23]. Plant-based TiO 2 NPs play a promising role to rapidly absorb on the surface of the pathogen and plant material where they function to kill pathogen in addition to the organogenesis and the growth-promoting response on plants [24,25].…”

Biomedical Potential of Plant-Based Selenium Nanoparticles: A Comprehensive Review on Therapeutic and Mechanistic Aspects

“…The plant extracts contain phenolic acid, sesquiterpenes, cinnamic acid, coumarin, monoterpenes, flavonoids, tannin, alkaloids, and other secondary metabolites which can act as both reducing and potential stabilizing agents in the synthesis of biocompatible SeNPs. [25][26][27][28][29][30] This review article focuses on the fabrication methodologies with a focus on plant-based synthetic approaches, morphological significance and diverse application potential of the plant-based SeNPs. Furthermore, this manuscript also provides detail on various mechanistic approaches that the plant-based SeNPs adopt to ameliorate human medical conditions.…”

Exogenous Applications of Bio-fabricated Silver Nanoparticles to Improve Biochemical, Antioxidant, Fatty Acid and Secondary Metabolite Contents of Sunflower

“…The sample was prepared by simply dropping the colloidal suspension of AgNPs on a carbon-coated copper grid. The residues were removed by using the blotting paper, and the sample was left to dry for 5 min, under a mercury lamp [ 23 ].…”