Bioreduction of chloroaurate ions by geranium leaves and its endophytic fungus yields gold nanoparticles of different shapes

Shankar, S. Shiv; Ahmad, Absar; Pasricha, Renu; Sastry, Murali

doi:10.1039/b303808b

Cited by 883 publications

(470 citation statements)

References 35 publications

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“…The shape and size of biogenic nanoparticles depends on the biological species involved, for example, geranium leaf broth reacted with aqueous chloroaurate ions induced a variety of gold nanoparticle shapes that included rods, flat sheets and triangles, while its endophytic fungus (Colletotrichum sp.) produced essentially spherical nanoparticles under the same conditions (12). Yet another plant, lemongrass (leaf broth) induced the formation of a high percentage of single-crystalline gold nanotriangles under similar conditions (1).…”

Section: Introductionmentioning

confidence: 95%

Synthesis of Plant-Mediated Gold Nanoparticles and Catalytic Role of Biomatrix-Embedded Nanomaterials

Sharma

Sahi

Nath

et al. 2007

Environ. Sci. Technol.

353

210

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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 plant tissues. 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.

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Section: Introductionmentioning

confidence: 95%

Synthesis of Plant-Mediated Gold Nanoparticles and Catalytic Role of Biomatrix-Embedded Nanomaterials

Sharma

Sahi

Nath

et al. 2007

Environ. Sci. Technol.

353

210

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“…Figure 1 shows the UV-vis spectra recorded from the aqueous chloroauric acid-extracellular filtrate of the F. semitectum biomass reaction medium as a function of reaction time. From figure 1, it is inferred that the band corresponding to the surface plasmon resonance occurs at 545 nm [24] the alloy nanoparticles are also on the same 2θ values of the Ag and Au patterns [22,24,25].…”

Section: Resultsmentioning

confidence: 89%

“…It is observed that the color of the solution turned from colorless to purple after 4 h of the reaction, indicating the formation of AuNP. AuNP exhibit purple color in water; this color arises owing to surface plasmon vibrations in the metal nanoparticles [23][24][25]. This important observation indicates that the reduction of the AuCl − 4 ions takes place extracellularly.…”

Section: Resultsmentioning

confidence: 99%

Biosynthesis and stabilization of Au and Au–Ag alloy nanoparticles by fungus,Fusarium semitectum

Sawle

Salimath

Deshpande

et al. 2008

Science and Technology of Advanced Materials

108

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Crystallized and spherical-shaped Au and Au-Ag alloy nanoparticles have been synthesized and stabilized using a fungus, F. semitectum in an aqueous system. Aqueous solutions of chloroaurate ions for Au and chloroaurate and Ag + ions (1 : 1 ratio) for Au-Ag alloy were treated with an extracellular filtrate of F. semitectum biomass for the formation of Au nanoparticles (AuNP) and Au-Ag alloy nanoparticles (Au-AgNP). Analysis of the feasibility of the biosynthesized nanoparticles and core-shell alloy nanoparticles from fungal strains is particularly significant. The resultant colloidal suspensions are highly stable for many weeks. The obtained Au and Au-Ag alloy nanoparticles were characterized by the surface plasmon resonance (SPR) peaks using a UV-vis spectrophotometer, and the structure, morphology and size were determined by Fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), and transmission electron microscopy (TEM). Possible optoelectronics and medical applications of these nanoparticles are envisaged.

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“…Recent research in this field has reported the use of different plant leaf extracts for synthesizing silver nanoparticles, such as Gloriosa superba L. (47), Citrus limon L. (48), Carob (49) and Tephrosia purpurea L. (50). On the other hand, the synthesis of gold nanoparticles was reported using a tea leaf extract (51), Pelargonium graveolens (PeG) (52), Punica granatum (PuG) (53), Salvia offiinalis (SO) (54) and Morinda citrifolia roots extracts (55). Different nanoparticles derived from silver, nickel, cobalt, zinc, copper and Indium oxide have also been synthesized using plants extracts of Brassica juncea L. (Indian mustard), Medicago sativa L. (Alfalfa), Helianthus annuus L. (Sunflower) and Aloe barbadensis (56,57).…”

Section: Introductionmentioning

confidence: 99%

Artemisia herba-alba Asso eco-friendly reduced few-layered graphene oxide nanosheets: structural investigations and physical properties

Khenfouch

Ndimba

Diallo

et al. 2016

Green Chemistry Letters and Reviews

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Nowadays graphene is universally known as a promising material. Hence, the development of ecofriendly synthesis methods for this material is of great importance. This study reports on the biosynthesis of graphene by a green chemistry process using Artemisia herba-alba Asso (AHAA) natural extract. Moreover, this work reports on the physical properties, including surface/ interface and optical and electrical properties of the obtained graphene sheets. UV-VIS, Raman, XPS spectroscopies and TEM microscopy investigations confirmed the reduction, and the conversion of graphene oxide to few-layered reduced graphene oxide as well as the efficiency of this plant extract compared with several natural extracts and chemical agents. Furthermore, it was found that the optical and electrical properties of graphene can be modulated and controlled via this eco-friendly cost-effective process. Hence, AHAA can be an effective chelating agent to produce graphene sheets. ARTICLE HISTORY

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Bioreduction of chloroaurate ions by geranium leaves and its endophytic fungus yields gold nanoparticles of different shapes

Cited by 883 publications

References 35 publications

Synthesis of Plant-Mediated Gold Nanoparticles and Catalytic Role of Biomatrix-Embedded Nanomaterials

Synthesis of Plant-Mediated Gold Nanoparticles and Catalytic Role of Biomatrix-Embedded Nanomaterials

Biosynthesis and stabilization of Au and Au–Ag alloy nanoparticles by fungus,Fusarium semitectum

Artemisia herba-alba Asso eco-friendly reduced few-layered graphene oxide nanosheets: structural investigations and physical properties

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