This study deals with facile and rapid synthesis of silver nanoparticles (AgNPs) and Gold nanoparticles (AuNPs) using Mentha longifolia leaves extracts (MLE). The synthesized AgNPs and AuNPs were characterized by UV-visible spectroscopy (UV-Vis), Fourier transformed infra-red spectroscopy (FT-IR), atomic force microscopy (AFM) and transmission electron microscopy (TEM) techniques. The phytochemical analysis showed the presence of bioactive secondary metabolites, which are involved in the synthesis of nanoparticles (NPs). The surface plasmon resonance (SPR) observed at 435 and 550 nm, confirmed the green synthesis of AgNPs and AuNPs, respectively. The TEM images showed poly dispersed and round oval shapes of Ag and Au NPs with an average particles size of 10.23 ± 2 nm and 13.45 ± 2 nm, respectively. TEM results are in close agreements with that of AFM analysis. The FT-IR spectroscopy revealed the presence of OH, -NH 2 and C ¼ O groups, which involved in the synthesis of NPs. The MLE and their AgNPs and AuNP exhibited good in vitro antibacterial and anti-oxidant activities. Moreover, MLE and NPs also showed in vivo analgesic activities in mice, and excellent sedative properties in open field test paradigm.
The goals of the present study were to use silver nitrate (AgNO 3 ) solution to synthesize plant-mediated silver nanoparticles (AgNPs) using Boerhavia procumbens extract, to evaluate the antimicrobial potential of crude B. procumbens extracts as well as the antimicrobial potential of synthesized AgNPs. The antimicrobial activity was tested against ten pathogenic bacterial strains including Klebsiella pneumonia, Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Citrobacter braakii, Providentia spp., Salmonella typhi, Salmonella para typhi, Vibrio cholera, and Proteus vulgaris and seven fungal species; Rhizopus stolonifer, Candida albican, Alternaria alternata, Aspergillus flavus, Verticillium chlamydosporium, Penicillium chrysogenum, and Aspergillus oryzae. The methanol extract was fractionated using several solvents and subjected to phytochemical analysis along with FTIR. Phytochemical analyses revealed flavonoids, tannins, saponins, steroids, quinones, and phenols in the crude plant extract. AgNPs were synthesized using B. percumbens extract and characterized by UV-Vis, Fourier-transform infrared spectroscopy (FTIR), and Scanning Electron Microscopy (SEM). Synthesized AgNPs were spherical, with 20-80 nm diameter. The absorption peak of synthesized AgNPs was observed at 392 nm. AgNPs have significant antimicrobial potential against selected pathogenic bacterial and fungal species as compared to different fractions of crude B. procumbens extract. The current study suggests that green synthesis is a useful technique and can be used as an alternative to antimicrobial agents against pathogenic organisms.
Synthesis of nanoparticles is a fast-growing area of interest in the current development in science and technology. Nanoparticles are also used in biomedical applications. Green synthesis of nanoparticles is an environmental friendly and cost-effective technique. Trillium govanianum Wall. Ex. Royle crude extract was used for the eco-friendly genesis of silver nanoparticles (AgNPs). Aromatic amines were the functional groups involved in the bio-fabrication and synthesis of the AgNPs. The production of AgNPs was established by the appearance of brown color. The manufactured AgNPs were characterized by UV-Vis spectrophotometer, X-ray diffractometer, and FTIR spectrophotometer. AgNPs were face-centered cubic in nature with an average size of 9.99 nm. The produced AgNPs (18 µL disc−1) showed substantial antibacterial (53.74, 52.75, 51.61, 43.00, 36.84, and 36.84%) and antifungal (54.05, 42.11, 41.10, 40.85, 30.55, and 29.73%) potential against the tested bacterial (X. campestris, P. aeruginosa, S. aureus, E. coli, B. subtilis, and K. pneumoniae) and fungal (A. alternaria, Paecilomyces, C. albicans, Curvularia, A. niger, and Rhizopus) strains, respectively.
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