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

Veronica Armendariz, Isaac Herrera, Jose R. Peralta-Videa, Miguel Jose-Yacaman, Horacio Troiani, Patricia Santiago, Jorge L. Gardea-Torresdey

Research output: Contribution to journalArticlepeer-review

468 Scopus citations


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 fee 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.

Original languageEnglish (US)
Pages (from-to)377-382
Number of pages6
JournalJournal of Nanoparticle Research
Issue number4
StatePublished - Aug 2004
Externally publishedYes


  • Gold
  • Nanobiotechnology
  • Nanoparticles
  • Oat biomass
  • pH

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Modeling and Simulation


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