Green Nanotechnology from Plant Extracts: Synthesis and Characterization of Gold Nanoparticles

Abstract

The advantage of using plants in nanoparticles synthesis is that they are easily available, safe to handle and possess a broad variability of metabolites such as antioxidants, nucleotides and vitamins. The aim of this study was to investigate the effects of Green and Zimbro tea and also Green coconut water as a reducing and stabilizer agent in gold nanoparticle synthesis. The gold nanoparticles were characterized by UV-Vis absorption spectroscopy, X-ray diffraction (XRD), Dynamic light scattering (DLS) and Transmission electron microscopy (TEM) analysis. Their physical stability was determined using a UV-Vis spectrophotometer over several days during storage at room temperature. We observed that green chemical process to obtain gold nanoparticles did not require any external chemicals reagent for stabilization of nanoparticulate. Absorption measurements indicated that the plasmon resonance wavelength appears around 530 nm. X-ray diffractograms of gold nanoparticles evidenced the presence of Au-rich (fcc) phases. TEM analysis showed a homogeneous dispersion of nanoparticles and some agglomerates. Differences in size and shape of the nanoparticles were observed. Zeta potential of AuNPs synthetized in presence of Green tea was −33 mV indicating stability of the synthesized nanoparticles.

Degradation of DDT by gold nanoparticles synthesised using Lawsonia inermis for environmental safety

“…Furthermore, L. inermis components can effectively prevent the aggregation of the nanoparticles. This observation is in agreement with earlier reports [23], in which AuNPs were synthesised using green tea, zimbro tea and green coconut water. Besides, AuNPs were synthesised using the flower extract of Plumeria alba [24].…”

Biological Effect of Organically CoatedGrias neuberthiiandPersea americanaSilver Nanoparticles on HeLa and MCF-7 Cancer Cell Lines

“…Since AgNPs absorbance is in the range of 390-430 nm [49,50], our results con rm the presence of nanoparticles. However, synthesized NPs lacked uniformity, suggesting that the obtained NPs have di erent shapes, sizes [49], and were not completely monodispersed (agglomeration) [51]. e second peak clearly corresponded to DMEM, which absorbs at wavelengths from 440 to 560 nm depending on the solution's pH [52].…”

Virucidal Activity of Gold Nanoparticles Synthesized by Green Chemistry Using Garlic Extract

“…The bioactive composites extracted of natural sources have shown antiviral properties and high chemical reactivity which confers the reductive capacity of metallic salts as AgNO 3 and HAuCl 4 [6]. The formation of NPs by green chemistry provides a low cost, environment friendly technique that is easy to apply for large scale [7,14].…”