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Biomimetic Synthesis of Gelatin Polypeptide-Assisted Noble-Metal Nanoparticles and Their Interaction Study

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ABSTRACT

Herein, the generation of gold, silver, and silver–gold (Ag–Au) bimetallic nanoparticles was carried out in collagen (gelatin) solution. It first showed that the major ingredient in gelatin polypeptide, glutamic acid, acted as reducing agent to biomimetically synthesize noble metal nanoparticles at 80°C. The size of nanoparticles can be controlled not only by the mass ratio of gelatin to gold ion but also by pH of gelatin solution. Interaction between noble-metal nanoparticles and polypeptide has been investigated by TEM, UV–visible, fluorescence spectroscopy, and HNMR. This study testified that the degradation of gelatin protein could not alter the morphology of nanoparticles, but it made nanoparticles aggregated clusters array (opposing three-dimensional α-helix folding structure) into isolated nanoparticles stabilized by gelatin residues. This is a promising merit of gelatin to apply in the synthesis of nanoparticles. Therefore, gelatin protein is an excellent template for biomimetic synthesis of noble metal/bimetallic nanoparticle growth to form nanometer-sized device.

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a UV–vis spectra of gelatin-AuNPs (1) synthesized at 80°C (: 4 mL) and AgNPs precursor (2); b XRD of gelatin-AuNPs film dried at room temperature under vacuum. c TEM image of gelatin-AuNPs.
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Figure 11: a UV–vis spectra of gelatin-AuNPs (1) synthesized at 80°C (: 4 mL) and AgNPs precursor (2); b XRD of gelatin-AuNPs film dried at room temperature under vacuum. c TEM image of gelatin-AuNPs.

Mentions: The synthesis of non-spherical AuNPs was also prepared using gelatin-directed AgNPs as crystal seeds. Figure 11a showed that the plasmon resonance band of AgNPs at 413 nm in gelatin-AuNPs colloid disappeared. There was a broad plasmon resonance band of AuNPs at 559 nm. The large face on the gelatin-directed gold crystals is also (111) (see Figure 11b). Figure 11c showed the formation of triangle and rod AuNPs. The shape of the formed nanoparticles in this article would be discussed at length in a later paper.


Biomimetic Synthesis of Gelatin Polypeptide-Assisted Noble-Metal Nanoparticles and Their Interaction Study
a UV–vis spectra of gelatin-AuNPs (1) synthesized at 80°C (: 4 mL) and AgNPs precursor (2); b XRD of gelatin-AuNPs film dried at room temperature under vacuum. c TEM image of gelatin-AuNPs.
© Copyright Policy - open-access
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3211277&req=5

Figure 11: a UV–vis spectra of gelatin-AuNPs (1) synthesized at 80°C (: 4 mL) and AgNPs precursor (2); b XRD of gelatin-AuNPs film dried at room temperature under vacuum. c TEM image of gelatin-AuNPs.
Mentions: The synthesis of non-spherical AuNPs was also prepared using gelatin-directed AgNPs as crystal seeds. Figure 11a showed that the plasmon resonance band of AgNPs at 413 nm in gelatin-AuNPs colloid disappeared. There was a broad plasmon resonance band of AuNPs at 559 nm. The large face on the gelatin-directed gold crystals is also (111) (see Figure 11b). Figure 11c showed the formation of triangle and rod AuNPs. The shape of the formed nanoparticles in this article would be discussed at length in a later paper.

View Article: PubMed Central - HTML - PubMed

ABSTRACT

Herein, the generation of gold, silver, and silver–gold (Ag–Au) bimetallic nanoparticles was carried out in collagen (gelatin) solution. It first showed that the major ingredient in gelatin polypeptide, glutamic acid, acted as reducing agent to biomimetically synthesize noble metal nanoparticles at 80°C. The size of nanoparticles can be controlled not only by the mass ratio of gelatin to gold ion but also by pH of gelatin solution. Interaction between noble-metal nanoparticles and polypeptide has been investigated by TEM, UV–visible, fluorescence spectroscopy, and HNMR. This study testified that the degradation of gelatin protein could not alter the morphology of nanoparticles, but it made nanoparticles aggregated clusters array (opposing three-dimensional α-helix folding structure) into isolated nanoparticles stabilized by gelatin residues. This is a promising merit of gelatin to apply in the synthesis of nanoparticles. Therefore, gelatin protein is an excellent template for biomimetic synthesis of noble metal/bimetallic nanoparticle growth to form nanometer-sized device.

No MeSH data available.