Biomimetic Mineralization of Noble Metal Nanoclusters

Slocik, Joseph M.; Wright, David W.

doi:10.1021/bm034003q

Cited by 136 publications

(132 citation statements)

References 36 publications

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“…14, 15 The major drawback of this approach is that the samples require extensive purification after synthesis. Both approaches using sodium borohydride and using redox-active peptides are therefore different from the current approach, which uses DMF as a reducing agent.…”

Section: Discussion Particle Formationmentioning

confidence: 99%

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Silver nanoparticle engineering via oligovaline organogels

et al. 2008

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L-Valine-based oligopeptides with the chemical structure Z-(L-Val) 3 -OMe and Z-(L-Val) 2 -L-Cys (S-Bzl)-OMe form stable organogels in butanol. Both peptides are efficient gelators, but Z-(L-Val) 2 -L-Cys(S-Bzl)-OMe crystallizes more readily than Z-(L-Val) 3 -OMe. The two peptides can form mixed fibers, which also gel butanol. The resulting organogels are very similar to oligovaline organogels reported earlier (Mantion and Taubert, Macromol. Biosci., 2007, 7, 208) as they also form highly ordered peptide fibers with a predominant b-sheet structure and diameters of ca. 100 nm. The fibers can be mineralized with silver nanoparticles using DMF as a reducing agent. The fraction of the sulfurcontaining peptide Z-(L-Val) 2 -L-Cys(S-Bzl)-OMe controls the shape and size of the resulting nanoparticles. At high Z-(L-Val) 2 -L-Cys(S-Bzl)-OMe content, small spherical particles are distributed all over the fiber. Lower contents of Z-(L-Val) 2 -L-Cys(S-Bzl)-OMe lead to a size increase of the particles and to more complex shapes like plate-like and raspberry-like silver particles. The interactions between peptide and silver ions or silver particles takes place via a complexation of the silver ions to the sulfur atom of the thioether moiety, and are shown to be the key interaction in controlling particle formation.

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Section: Discussion Particle Formationmentioning

confidence: 99%

“…14,15 These studies all show that peptides can act as in situ reducing agents and/or as nucleation centers for the formation of silver with various shapes.…”

Section: Introductionmentioning

confidence: 97%

Silver nanoparticle engineering via oligovaline organogels

et al. 2008

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“…In these processes, organic molecules are used as templates to control the shape and size of metallic nanoparticles (40,41) formed by adding strong reductants to bound cations. For copper nanoparticles and nanowires, a milder reductantsascorbic acidshas been used.…”

Section: Mechanism Of Cumentioning

confidence: 99%

Formation of Metallic Copper Nanoparticles at the Soil−Root Interface

Manceau

Nagy

Marcus

et al. 2008

Environ. Sci. Technol.

222

117

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Copper is an essential element in the cellular electron-transport chain, but as a free ion it can catalyze production of damaging radicals. Thus, all life forms attempt to prevent copper toxicity. Plants diminish excess copper in two structural regions: rare hyperaccumulators bind cationic copper to organic ligands in subaerial tissues, whereas widespread metal-tolerant plants segregate copper dominantly in roots by mechanisms thought to be analogous. Here we show using synchrotron microanalyses that common wetlands plants Phragmites australis and Iris pseudoacorus can transform copper into metallic nanoparticles in and near roots with evidence of assistance by endomycorrhizal fungi when grown in contaminated soil in the natural environment. Biomolecular responses to oxidative stress, similar to reactions used to abiotically synthesize Cu0 nanostructures of controlled size and shape, likely cause the transformation. This newly identified mode of copper biomineralization by plant roots under copper stress may be common in oxygenated environments.

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“…For this strategy, in the initial reaction step, the metal ion precursors actively bind with correctly located reactive amino acid residues, which may cause partial reduction of precursors forming the nucleation sites. Consequently, upon addition of a reducing agent the additional precursors in the reaction media allow growth of metal nanoparticles over the nucleation sites, obtaining particles directly attached to the biotemplates [6,7]. Viral templates (complete viruses or virus-like particles) stand out as bioscaffolds due to their advantageous inner nanometer-range properties: self-assembly capacity, monodispersity, discrete size and shape, stability, symmetry, and biocompatibility [8].…”

Section: Introductionmentioning

confidence: 99%

Molecular Docking and Aberration-Corrected STEM of Palladium Nanoparticles on Viral Templates

Carreño-Fuentes¹,

Bahena

Palomares³

et al. 2016

Metals

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Viral templates are highly versatile biotemplates used for the synthesis of nanostructured materials. Rotavirus VP6 self-assembles into nanotubular hollow structures with well-defined diameters and variable lengths, serving as a nucleic acid-free biotemplate to synthesize metal nanoparticles of controlled size, shape, and orientation. Molecular docking simulations show that exposed residues (H173-S240-D242 and N200-N310) of VP6 have the ability to specifically bind Pd(II) ions, which serve as nucleation sites for the growth and stabilization of palladium nanoclusters. Using VP6 nanotubes as biotemplates allows for obtaining small Pd particles of 1-5 nm in diameter. Advanced electron microscopy imaging and characterization through ultra-high-resolution field-emission scanning electron microscopy (UHR-FE-SEM) and spherical aberration-corrected scanning transmission electron microscopy (Cs-STEM) at a low voltage dose (80 kV) reveals, with high spatial resolution, the structure of Pd nanoparticles attached to the macromolecular biotemplates.

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Biomimetic Mineralization of Noble Metal Nanoclusters

Cited by 136 publications

References 36 publications

Silver nanoparticle engineering via oligovaline organogels

Silver nanoparticle engineering via oligovaline organogels

Formation of Metallic Copper Nanoparticles at the Soil−Root Interface

Molecular Docking and Aberration-Corrected STEM of Palladium Nanoparticles on Viral Templates

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