A biomimetic synthesis of stable gold nanoparticles derived from aqueous extract of Foeniculum vulgare seeds and evaluation of their catalytic activity

Abstract

A facile biomimetic approach for the synthesis of gold nanoparticles (AuNPs) using aqueous extract of fennel (Foeniculum vulgare) seeds have been reported in this article. The seeds of F. vulgare are rich in various plant secondary metabolites (phytochemicals) such as polyphenolic acids, flavonoids, and saponins. The phytochemicals of F. vulgare seeds play dual role of reducing and stabilizing agents. The formation of gold nanoparticles was evidenced from the appearance of intense purple color at room temperature with k max around 550 nm in the UV-Vis absorption spectra. The stable AuNPs were further characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and transmission electron microscopy (TEM) analysis. The synthesized nanoparticles were observed to be polydispersed, spherical and ranged from 10 to 30 nm with an average size of 20 ± 2 nm, as obtained from TEM images. The catalytic activity of gold nanoparticles was investigated by studying the reduction of anthropogenic dyes such as methylene blue (MB) and rhodamine B (Rh-B) with sodium borohydride. Results showed the possible applications of biogenic AuNPs in environment related problems.

Biosynthesis and characterization of gold nanoparticles using Brazilian red propolis and evaluation of its antimicrobial and anticancer activities

“…3 e,g). In general, the biosynthetic route produces nanoparticles with different morphology and size as a result of the chemical composition of the extract 46 , 47 . Hexane fraction is rich in benzophenones (Guttiferone E; Oblongifolin A), while ethyl acetate fraction is rich in flavonoids and isoflavonoids such as liquiritigenin, formononetin, vestitol, and neovestitol.…”

Green biomimetic preparation of efficient Ag–ZnO heterojunctions with excellent photocatalytic performance under solar light irradiation: a novel biogenic-deposition-precipitation approach

“…23 These dihydroxy compounds exhibit antioxidant potential; 24 they synergistically donate electrons to Ag + ions adsorbed onto the ZnO nanostructures and reduce them to Ag 0 and are concomitantly oxidized to corresponding quinones. 25,26 This BDP approach for the preparation of noble metal-metal oxide binary heterojunctions does not involve the use of any toxic chemicals or high energy input. Moreover, the entire process occurs smoothly in an aqueous solvent at room temperature; thus, it is a costeffective and green method for nanomaterial fabrication.…”

Exploration of the Antimicrobial and Catalytic Properties of Gold Nanoparticles Greenly Synthesized by Cryptolepis buchanani Roem. and Schult Extract

“…For AuNP synthesis, various plant extracts such as Olea europaea [15], Ipomoea carnea [16], Salix alba [17], Genipa americana [18], Dalbergia coromandeliana [19], Piper longum [20], Eucommia ulmoides bark [21], Butea monosperma [22], Momordica charatia [23], and Lagerstroemia speciosa [24] have been proposed. Polyphenolic, terpenoids, alkaloids, and sugars have been reported as being very well-known functional groups responsible for metal reducibility and nanoparticle stability [25]. Hence, plants that contain these groups may be utilized as biobased resources.…”