Size controlled gold nanoparticle formation by Avena sativa biomass: use of plants in nanobiotechnology

By V. Armendariz, I. Herrera, J. Peralta-Videa, M. José-Yacamán, H. Troiani, P. Santiago, J. Gardea-Torresdey. 2004

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Oat (Avena sativa) biomass was studied as an alternative to recover Au(III) ions from aqueous solutions and for its capacity to reduce Au(III) to Au(0) forming Au nanoparticles. To study the binding trend of Au(III) to oat and the possible formation of Au nanoparticles, the biomass and a solution of Au(III) were reacted for a period of 1 h at pH values ranging from 2 to 6. The results demonstrated that Au(III) ions were bound to oat biomass in a pH-dependent manner, with the highest adsorption (about 80%) at pH 3. HRTEM studies showed that oat biomass reacted with Au(III) ions formed Au nanoparticles of fcc tetrahedral, decahedral, hexagonal, icosahedral multitwinned, irregular, and rod shape. To our knowledge, this is the second report about the production of nanorods as a product of the reaction of a Au(III) solution with a biological material. These studies also showed that the pH of the reaction influenced the nanoparticle size. The smaller nanoparticles and the higher occurrence of these were observed at pH values of 3 and 4, whereas the larger nanoparticles were observed at pH 2.

Subfields: Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/1f2fd1291d0200b0c81f7e7b9cd70448888d9783

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Citations in the corpus

Green Synthesis of Metallic Nanoparticles: Applications and Limitations (2021, background): “[142] observed smaller sized gold NPs at pH 3.”
Green nanobiotechnology: factors affecting synthesis and characterization techniques (2014, background): “Researchers have discovered that pH of the solution medium influences the size and texture of the synthesized nanoparticle [23, 24].”
Biosynthesis of nanoparticles: technological concepts and future applications (2008, background): “Armendariz et al. (2004) have reported the pH-dependent binding trend of Au (III) ions to Avena sativa (Oat) biomass and subsequent formation of Au nanoparticles of variable sizes.”
Qualitative assessment of silver and gold nanoparticle synthesis in various plants: a photobiological approach (2010, background): “Quite a few reports are available in the literature on the extracellular biosynthesis of Ag and Au nanoparticles using several plants, plant pure compounds, microorganisms and enzymes (Song and Kim 2008; Armendariz et al. 2004 ; C handran et al.2006 ;S ong et al.2009; Kasthuri et al. 2008; Krpetic ”
Synthesis of metallic nanoparticles using plant extracts. (2013, methodology): “In view of its simplicity, the use of live plants or whole plant extract and plant tissue for reducing metal salts to nanoparticles has attracted considerable attention within the last 30-years (Ankamwar, 2010; Armendariz et al., 2004; Beattie and Haverkamp, 2011; Gan and Li, 2012; Gardea-Torresdey ”