Gold nanoparticles obtained by bio-precipitation from gold(III) solutions

J. L. Gardea-Torresdey, K. J. Tiemann, G. Gamez, K. Dokken, S. Tehuacanero, M. José-Yacamán

Research output: Contribution to journalArticlepeer-review

206 Scopus citations


The use of metal nanoparticles has shown to be very important in recent industrial applications. Currently gold nanoparticles are being produced by physical methods such as evaporation. Biological processes may be an alternative to physical methods for the production of gold nanoparticles. Alfalfa biomass has shown to be effective at passively binding and reducing gold from solutions containing gold(III) ions and resulting in the formation of gold(0) nanoparticles. High resolution microscopy has shown that five different types of gold particles are present after reaction with gold(III) ions with alfalfa biomass. These particles include: fee tetrahedral, hexagonal platelet, icosahedral multiple twinned, decahedral multiple twinned, and irregular shaped particles. Further analysis on the frequency of distribution has shown that icosahedral and irregular particles are more frequently formed. In addition, the larger particles observed may be formed through the coalescence of smaller particles. Through modification of the chemical parameters, more uniform particle size distribution may be obtained by the alfalfa bio-reduction of gold(III) from solution.

Original languageEnglish (US)
Pages (from-to)397-404
Number of pages8
JournalJournal of Nanoparticle Research
Issue number3
StatePublished - 1999
Externally publishedYes


  • Bio-reduction method
  • Coalescence
  • Gold colloids
  • Irregular shaped nanoparticles
  • Particle synthesis

ASJC Scopus subject areas

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


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