Abstract
AbstractThis study was focused to synthesize silver nanoparticles (AgNps) from the aqueous extract ofBistorta amplexicauleand to evaluate their antimicrobial, antifungal, and 4-nitrophenol (4-NP) degradation potential. The AgNps fromB. amplexicaulewere characterized by field emission scanning electron microscopy, energy dispersive X-ray spectrometry, X-ray diffraction, and X-ray photoelectron spectroscopy studies. The biological activity of the AgNps was checked against the three bacterial and two fungal strains. The inhibition activities of the synthesized nanoparticles on pathogenic bacteria and fungi were equally studied using the colony-forming unit method. The AgNps synthesized showed excellent bactericidal and fungicidal activities against pathogenicEscherichia coli,Staphylococcus aureus, methicillin-resistantStaphylococcus aureus(MRSA),Candida albicans, andCandida tropicalis. The removal of nitrophenols is one of the most demanding tasks, due to their injurious impact on the health of the living organisms. The AgNps showed superior performance compared with the pure plant extract. The AgNps also displayed efficient catalytic ability in reducing toxic 4-NP into harmless 4-aminophenol in the presence of NaBH4solution. Hence, the synthesized AgNps can be effectively used against bacterial and fungal infections and in the decontamination of 4-NP polluted water.
Highlights
Nanotechnology is an important domain of modern research, which deals with the strategy, synthesis, and manipulation of the structure of the particles ranging in size from about 1 to 100 nm
The supernatant was refiltered with Whatman No 1 filter paper, and the filtrate was stored as rhizome aqueous extract (RAE) at 4°C before use
The bactericidal activities of the RAE and the biosynthesized AgNps were assessed on S. aureus, E. coli (O157:H7), and methicillin-resistant Staphylococcus aureus (MRSA)
Summary
Nanotechnology is an important domain of modern research, which deals with the strategy, synthesis, and manipulation of the structure of the particles ranging in size from about 1 to 100 nm. Various techniques have been developed and are being used for the synthesis of AgNps, such as physical, chemical, and green synthesis In all these methods, reducing agents are used to produce stabilized Nps by the reduction of silver ions to elemental form, followed by the nucleation and growing processes [10]. The route of green syntheses is the preferred one over the physical and chemical methods as it is eco-friendly and cost-effective and can be scaled up for the synthesis of Nps on large scale. This procedure does not require high input of energy, high temperature and pressure, and harmful chemicals [13]. Considering the ease of availability, phytochemical constituents, and ethnobotanical applications of B. amplexicaule, the plant has been selected for the synthesis of AgNps that may have potential applications
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