Abstract
A green, simple, and rapid synthesis of gold nanoparticles using plant extract, Cryptolepis buchanani Roem. and Schult, and their applications are first described in this paper. The formation of gold nanoparticles was visually observed by the appearance of a ruby red color, which was further indicated by an absorption peak at 530 nm in UV-Vis spectroscopy. Optimization of reaction parameters for the gold nanoparticles was also investigated. Various analytical techniques were employed as part of the process of characterizing the resulting gold nanoparticles. Fourier transform infrared (FTIR) analysis revealed that the phenol compounds present in the extract were responsible for gold(III) reduction and stabilization of gold nanoparticles. Transmission electron microscopy (TEM) analysis showed that the gold nanoparticles were spherical in shape with an average diameter of 11 nm. Powder X-ray diffraction (XRD) pattern indicated that the green synthesis approach produced highly crystalline, face-centered cubic gold nanoparticles. Energy-dispersive X-ray spectroscopy (EDS) measurements confirmed the presence of elemental gold in the prepared nanoparticles. The negative zeta potential value of gold nanoparticles was found to be -30.28 mV. The green synthesized gold nanoparticles expressed effective antibacterial activity against Staphylococcus aureus, methicillin-resistant Staphylococcus aureus, and Acinetobacter baumannii and exhibited an excellent catalytic property in terms of its reduction ability of methylene blue.
Highlights
There has been a gradual emergence of investigation into the potential of metal nanoparticles in a variety of areas; this is due to their unique optical, electromagnetic, and area/volume properties [1, 2]
The aims of this study are to prepare the AuNPs with aqueous extract of C. buchanani and to assess their performance on the catalytic activity of methylene blue dye and antibacterial activities
All chemicals used in this study were of analytical reagent grade and deionized water was used throughout the reactions
Summary
There has been a gradual emergence of investigation into the potential of metal nanoparticles in a variety of areas; this is due to their unique optical, electromagnetic, and area/volume properties [1, 2]. One of the most applicable metal nanoparticles is gold nanoparticles (AuNPs). Several synthetic pathways have been developed in order to produce metal nanoparticles [3,4,5,6,7,8]. Conventional physical and chemical methods are commonly used as they provide uniform, stable, and size-controllable metal nanoparticles [9]. The physical process has a high production cost since it requires high pressure and high energy during the synthesis procedure [10]. Finding an alternative biological synthesis approach is in demand, especially one that is simple, less expensive, and more environmentally friendly [5, 9, 12]
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