Synthesis of plant-mediated gold nanoparticles and catalytic role of biomatrix-embedded nanomaterials.

Growth of Sesbania seedlings in chloroaurate solution resulted in the accumulation of gold with the formation of stable gold nanoparticles in plant tissues. Transmission electron microscopy revealed the intracellular distribution of monodisperse nanospheres, possibly due to reduction of the metal ions by secondary metabolites present in cells. X-ray absorption near-edge structure and extended X-ray absorption fine structure demonstrated a high degree of efficiency for the biotransformation of Au(III) into Au(0) by planttissues. The catalytic function of the nanoparticle-rich biomass was substantiated by the reduction of aqueous 4-nitrophenol (4-NP). This is the first report of gold nanoparticle-bearing biomatrix directly reducing a toxic pollutant, 4-NP.

[1]  Dietmar Pum,et al.  The application of bacterial S-layers in molecular nanotechnology , 1999 .

[2]  Shiv Shankar,et al.  Bioreduction of chloroaurate ions by geranium leaves and its endophytic fungus yields gold nanoparticles of different shapes , 2003 .

[3]  Jose R. Peralta-Videa,et al.  Formation and Growth of Au Nanoparticles inside Live Alfalfa Plants , 2002 .

[4]  J. Peralta-Videa,et al.  Alfalfa sprouts: A natural source for the synthesis of silver nanoparticles , 2003 .

[5]  R. Kumar,et al.  Extracellular Biosynthesis of Monodisperse Gold Nanoparticles by a Novel Extremophilic Actinomycete, Thermomonospora sp. , 2003 .

[6]  S. Sahi,et al.  Characterization of a lead hyperaccumulator shrub, Sesbania drummondii. , 2002, Environmental science & technology.

[7]  J. Gardea-Torresdey,et al.  Chemical speciation and cellular deposition of lead in Sesbania drummondii , 2004, Environmental toxicology and chemistry.

[8]  T. Pradeep,et al.  Coalescence of Nanoclusters and Formation of Submicron Crystallites Assisted by Lactobacillus Strains , 2002 .

[9]  C. R. Smith,et al.  An investigation of the antitumor activity of Sesbania drummondii. , 1981, Journal of natural products.

[10]  Sudhakar R. Sainkar,et al.  Fungus-mediated synthesis of silver nanoparticles and their immobilization in the mycelial matrix: a novel biological approach to nanoparticle synthesis , 2001 .

[11]  R. Brooks Plants that hyperaccumulate heavy metals: their role in phytoremediation, microbiology, archaeology, mineral exploration and phytomining. , 1998 .

[12]  B. Ravel,et al.  ATOMS: crystallography for the X-ray absorption spectroscopist. , 2001, Journal of synchrotron radiation.

[13]  C. Granqvist,et al.  Biologically Produced Silver–Carbon Composite Materials for Optically Functional Thin‐Film Coatings , 2000 .

[14]  T. Ressler WinXAS: a program for X-ray absorption spectroscopy data analysis under MS-Windows. , 1998, Journal of synchrotron radiation.

[15]  Balaprasad Ankamwar,et al.  Biological synthesis of triangular gold nanoprisms , 2004, Nature materials.

[16]  S. Ghosh,et al.  Immobilization and recovery of au nanoparticles from anion exchange resin: resin-bound nanoparticle matrix as a catalyst for the reduction of 4-nitrophenol. , 2004, Langmuir : the ACS journal of surfaces and colloids.

[17]  R. Simcock,et al.  Harvesting a crop of gold in plants , 1998, Nature.

[18]  K. Schleifer,et al.  Diversity of Magnetotactic Bacteria , 1995 .