Abstract
Biosynthesis of metallic silver nanoparticles has now become an alternative to physical and chemical approaches. In the present study, silver nanoparticles (AgNPs) were synthesized from Cavendish banana peel extract (CBPE) and characterized by UV–visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, Atomic force microscopy (AFM), Field emission scanning electronic microscope (FESEM), Dynamic light scattering (DLS) and zeta potential (ZP). The AgNPs formation was confirmed by UV–visible spectroscopy through color conversion due to surface plasma resonance band at 430 nm. The effect of pH on nanoparticle synthesis was determined by adjusting the various pH of the reaction mixtures. The crystalline nature of nanoparticles was confirmed from the XRD pattern, and the grain size was found to be around 34 nm. To identify the compounds responsible for the bioreduction of Ag+ ion and the stabilization of AgNPs produced, the functional group present in Cavendish banana peel extract was investigated using FTIR. AFM has proved to be very helpful in determining morphological features and the diameter of AgNPs in the range of 23–30 nm was confirmed by FESEM. DLS studies revealed that the average size of AgNPs was found to be around 297 nm. Zeta potential value for AgNPs obtained was −11 mV indicating the moderate stability of synthesized nanoparticles. The antibacterial activity of the nanoparticles was studied against Gram-positive and Gram-negative bacteria. Biosynthesized AgNPs showed a strong DPPH radical and ABTS scavengers compared to the aqueous peel extract of Cavendish banana.
Highlights
Nanotechnology is emerging as a rapidly growing field with its application in science and technology (Albrecht et al 2006)
Atomic force microscopy (AFM) has proved to be very helpful in determining morphological features and the diameter of AgNPs in the range of 23–30 nm was confirmed by Field emission scanning electronic microscope (FESEM)
Banana peels are mainly composed of pectin, cellulose and hemicelluloses and the functional groups associated with these polymers as well as the proteinaceous matter may be involved in reducing the silver salt to Ag0
Summary
Nanotechnology is emerging as a rapidly growing field with its application in science and technology (Albrecht et al 2006). Nanobiotechnology is a field that interrelates both biological sciences and nanotechnology. It provides a platform for the development of ecofriendly and the green synthesis of nanoparticles with the help of biological sources like plants and microorganisms (Guangquan et al 2012). Metal nanoparticles have been of great interest due to their distinctive features such as catalytic, optical, magnetic, and electrical properties. Nanoparticles of noble metals, such as silver, gold and platinum, are widely applied in products that directly come in contact with the human body, such as shampoos, soaps, detergent, shoes, cosmetic products, and toothpaste, besides medical and pharmaceutical applications (Gong et al 2007). It has been reported that silver nanoparticles are non-toxic to humans and most effective
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