Doughnut-Shaped Peptide Nano-Assemblies and Their Applications as Nanoreactors

Djalali, Ramin; Samson, Jacopo; Matsui, Hiroshi

doi:10.1021/ja0319691

Cited by 84 publications

(76 citation statements)

References 41 publications

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“…16 (Figure 1). While the gallium precursors were hydrolyzed to GaOOH with base catalysts at room temperature, the gallium precursors were further hydrolyzed to β-Ga 2 O 3 only when the peptide assemblies capped those particles.…”

Section: Introductionmentioning

confidence: 99%

Biomimetic and Aggregation-Driven Crystallization Route for Room-Temperature Material Synthesis: Growth of β-Ga₂O₃ Nanoparticles on Peptide Assemblies as Nanoreactors

2007

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The room temperature synthesis of β-Ga 2 O 3 nanocrystal was examined by coupling two biomimetic crystallization techniques, the enzymatic peptide nano-assembly templating and the aggregationdriven crystallization. The catalytic template of peptide assembly nucleated and mineralized primary β-Ga 2 O 3 crystals, and then fused them to grow single-crystalline and monodisperse nanoparticles in the cavity of the peptide assembly at room temperature. In this work, the peptide assembly was exploited as a nano-reactor with an enzymatic functionality catalyzing the hydrolysis of gallium precursors. In addition, the characteristic ring-structure of peptide assembly is expected to provide an efficient dehydration pathway and the crystallization control over the surface tension, which are advantageous for the β-Ga 2 O 3 crystal growth. This multifunctional peptide assembly could be applied for syntheses of a variety of nanomaterials that are kinetically difficult to grow at room temperature.

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Section: Introductionmentioning

confidence: 99%

Biomimetic and Aggregation-Driven Crystallization Route for Room-Temperature Material Synthesis: Growth of β-Ga₂O₃ Nanoparticles on Peptide Assemblies as Nanoreactors

2007

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“…Importantly, the protein surface is amenable to both genetic and chemical manipulation to impart specific functionalities by design and it is easily achievable due to presence of accessible amino, thiol, and carboxyl groups (Zeng et al, 2007;Kang et al, 2009). The self-assembled peptides nanodoughnuts serve as template nanoreactors for the preparation of gold nanoparticles (Djalali et al, 2003;Keren et al, 2003;Djalali et al, 2004) (Scheme 4). Monodisperse gold nanocrystals grew inside the template by the reduction of gold (III) salt to neutral gold atom (Djalali et al, 2004).…”

Section: Preparation Of Gold and Silver Nanoparticlesmentioning

confidence: 99%

“…The self-assembled peptides nanodoughnuts serve as template nanoreactors for the preparation of gold nanoparticles (Djalali et al, 2003;Keren et al, 2003;Djalali et al, 2004) (Scheme 4). Monodisperse gold nanocrystals grew inside the template by the reduction of gold (III) salt to neutral gold atom (Djalali et al, 2004). Free nanoparticles were isolated by the destruction of protein shell using UV irradiation and heating.…”

Section: Preparation Of Gold and Silver Nanoparticlesmentioning

confidence: 99%

Noble Metal Nanoparticles and Their (Bio) Conjugates. I. Preparation

Capek¹

2016

IJC

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Noble metal nanoparticles are important subjects in the field of nanotechnology. Various synthetic processes have been summarized and discussed for the preparation of noble metal nanoparticles of different sizes, shapes and solubility. Among them the colloidal fluids are most fascinating. The formation of nanoparticles starts by the reduction of metal salt and continue with the agglomeration of metal atoms to embryos, subnanoparticles and to premature metal nanoparticles. The existence of the microenvironments in the colloidal systems gives nanoparticles unique reactivity towards various molecules and additives. A soft template can be applied to synthesize noble metal nanoparticles in different-shaped biomolecules-based nanoreactors, micelles and liposomes. The size and shape of nanoparticles follows reactant feed composition, reaction conditions, presence or absence of template and type and concentration of reactants.

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“…Various shapes of peptide/protein assemblies have been produced in biomaterials [44] . Monodisperse gold nanocrystals (AuNCs) grew inside the cavities of peptide nano-doughnuts by the reduction of Au ions trapped in the cavities and the resulting AuNCs were extracted by destroying the nano-doughnuts via long UV irradiation[ Figure 3] [45] . Because the peptide nano-doughnuts already contained gol ions inside the cavities, Au nanocrystal synthesis was completed in a simpler process as compared to that of micelle nanoreactors.…”

Section: Synthetic Approachesmentioning

confidence: 99%

“…After those samples were dried on mica surfaces, the peptide nano-doughnuts without gold nanocrystals collapsed and displayed a deformed ring shape, whereas the peptide nano-doughnuts with gold nanocrystals inside the cavities showed a monodisperse and isotropic ring shape. [45] .…”

Section: Synthetic Approachesmentioning

confidence: 99%

Plasmonic Nanoparticles and Their Conjugates: Preparation, Optical Properties and Antimicrobial Activity

Capek¹,

Internationals²

2015

JNMS

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To manipulate the size of noble metal particles on a nanometer scale are priority subjects in the field of nanotechnology. So far various approaches have been developed to synthesize noble metal nanoparticles in controlled sizes and dimensions. Among them the colloidal systems become broadly used. These systems can be made up of several very different reactants and solvents: a continuous medium water or alkane, surfactant and precursor(s). In some systems the formation of (sub) nanoparticles is based on the supersaturation of solution by reactants. The existence of the microenvironments gives them a particular ability to modulate the chemical reactivity of the reactants due to their compartmentalization in different microenvironments. The size and shape of noble metal nanoparticles follow the feed composition of reactants in the precursor solution, the reaction conditions and concentration and type of reactants. Surface modification and functionalization is expected to increase the stability of nanoparticles and organize them to the assembly of higher order array conjugates. Various soft and hard templates can be applied to produce noble metal nanoparticles in different shaped nanoreactors. Monodisperse gold nano crystals can grow inside soft templates and the cavities of hard templates by the reduction of metal ions trapped in the cavities. The interesting optical properties of noble metal nanoparticles and their (bio)conjugates results from the strong absorption in the visible spectrum region, so called the surface plasmon absorption. Some noble metal nanoparticles have been studied for their antimicrobial potential and have proven to be antibacterial and antiviral agents.

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Doughnut-Shaped Peptide Nano-Assemblies and Their Applications as Nanoreactors

Cited by 84 publications

References 41 publications

Biomimetic and Aggregation-Driven Crystallization Route for Room-Temperature Material Synthesis: Growth of β-Ga₂O₃ Nanoparticles on Peptide Assemblies as Nanoreactors

Biomimetic and Aggregation-Driven Crystallization Route for Room-Temperature Material Synthesis: Growth of β-Ga₂O₃ Nanoparticles on Peptide Assemblies as Nanoreactors

Noble Metal Nanoparticles and Their (Bio) Conjugates. I. Preparation

Plasmonic Nanoparticles and Their Conjugates: Preparation, Optical Properties and Antimicrobial Activity

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Doughnut-Shaped Peptide Nano-Assemblies and Their Applications as Nanoreactors

Cited by 84 publications

References 41 publications

Biomimetic and Aggregation-Driven Crystallization Route for Room-Temperature Material Synthesis: Growth of β-Ga2O3 Nanoparticles on Peptide Assemblies as Nanoreactors

Biomimetic and Aggregation-Driven Crystallization Route for Room-Temperature Material Synthesis: Growth of β-Ga2O3 Nanoparticles on Peptide Assemblies as Nanoreactors

Noble Metal Nanoparticles and Their (Bio) Conjugates. I. Preparation

Plasmonic Nanoparticles and Their Conjugates: Preparation, Optical Properties and Antimicrobial Activity

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Product

Resources

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Biomimetic and Aggregation-Driven Crystallization Route for Room-Temperature Material Synthesis: Growth of β-Ga₂O₃ Nanoparticles on Peptide Assemblies as Nanoreactors

Biomimetic and Aggregation-Driven Crystallization Route for Room-Temperature Material Synthesis: Growth of β-Ga₂O₃ Nanoparticles on Peptide Assemblies as Nanoreactors