Preparation of helical peptide monolayer-coated gold nanoparticles

Higashi, Nobuyuki; Kawahara, Jun; Niwa, Masazo

doi:10.1016/j.jcis.2005.02.086

Cited by 62 publications

(45 citation statements)

References 16 publications

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“…Recently, the green synthesis or fabrication of Au nanostructures have been considerably studied by using harmless alternative biocompatible molecules such as proteins, peptides, cellulose, soybeans, gellan gum, vitamin B2, starch, and D-glucose as stabilizing or reducing agents [5][6][7][8][9][10][11][12][13][14]. We also developed a facile route for the synthesis of Au nanoparticles by the use of food additives [15].…”

Section: Introductionmentioning

confidence: 99%

Facile green synthesis of gold nanoparticles with gum arabic as a stabilizing agent and reducing agent

Chen

2010

Gold Bull

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A facile, completely green, and cheap route for the synthesis of Au nanoparticles at 25-75°C has been developed by using only hydrogen tetrachloroaurate as the precursor and gum arabic (GA) simultaneously as a reducing agent and a stabilizing agent. No extra reagents are needed. From the analyses of UV/VIS absorption spectra, TEM, HRTEM, SAED, and XRD patterns, the formation of Au nanoparticles with a fcc structure was recognized. The synthesis reaction was usually finished in 2-4 h. Increasing the reaction temperature increased the formation rate but had no significant effect on the optical property and size of Au nanoparticles. With increasing Au(III) ion concentration or GA concentration, the mean diameter of Au nanoparticles slightly increased. Also, the particle size distribution became broader at higher Au(III) ion concentration or lower GA concentration due to the insufficient protection. Although raising the GA concentration was helpful to reduce Au(III) ions completely and stabilize the Au nanoparticles, too high GA concentration was not suitable for the stabilization of Au nanoparticles because the increased intermolecular force of GA might hinder the dispersion of Au nanoparticles. Furthermore, the resultant Au nanoparticles were found to remain highly stable in the NaCl solution.

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Section: Introductionmentioning

confidence: 99%

Facile green synthesis of gold nanoparticles with gum arabic as a stabilizing agent and reducing agent

Chen

2010

Gold Bull

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“…In PBLG spectrum, the typical peak appearing at 1733 cm -1 (corresponding to C=O stretching band of the ester group in the side chain), the typical peak appearing at 3287 cm -1 (corresponding to N-H stretching vibration), the typical peaks appearing at 1655 cm -1 and 1550 cm -1 (corresponding to the α-helix amide I band and the α-helix amide II band, respectively) are detected [7] . In PAA spectrum, the typical peak appearing at 3553 cm -1 (corresponding to hydroxyl groups), the typical peak appearing at 1718 cm -1 (corresponding to carbonyl groups) are detected [19] .…”

Section: Ft-ir Analysismentioning

confidence: 99%

“…In recent years, polypeptides and their copolymers have received much attention for their potential applications [1][2][3][4][5][6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

Modification of hydrophobic polypeptide-based film by blending with hydrophilic poly(acrylic acid)

et al. 2013

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Abstract:In this study, a series of poly(γ-benzyl L-glutamate)/poly(acrylic acid) (PBLG/PAA) polymer blend films were prepared by casting the polymer blend solution in dimethylsulfoxide (DMSO). The structure and morphology of the polymer blend film were investigated by Fourier Transform Infrared Spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM). Thermal, mechanical, and chemical properties of PBLG/PAA polymer blend films were studied by Differential Scanning Calorimetry (DSC), Thermogravimetric (TG) Analysis, Tensile Tests, and measurements of Surface Contact Angles. The results revealed that the introduction of PAA could exert great effects on the structure and properties of the polypeptide films.

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“…Disulfide bond-attached poly(g-benzyl-L-glutamate) was first synthesized by the NCA-polymerization method, according to the manner reported previously, 9 and then the removal of the benzyl group in the side chain by 5% HBr/CH 3 COOH resulted in the objective disulfide bond-attached poly(L-glutamic acid) (PLGA-SS). The degree of polymerization (n) was 18, as determined by 1 H-NMR spectroscopy.…”

Section: Experimental Procedures Materialsmentioning

confidence: 99%

“…Previously, we successfully prepared a poly(g-benzyl-L-glutamate)-coated gold nanoparticle that was stably dispersed in organic solvents without any aggregation. 9 In this paper, we fabricated multilayered films of gold nanoparticles coated with anionic poly(L-glutamic acid), and polycations, using the layer-by-layer (LbL) technique. 10,11 Among inorganic (or metallic) and polymeric nanoparticles, gold nanoparticles have an easily modified surface and are detectable spectroscopically because of their surface plasmon resonance.…”

Section: Introductionmentioning

confidence: 99%

Layer-by-layer fabrication of well-packed gold nanoparticle assemblies guided by a β-sheet peptide network

Higashi

Takagi

Koga

2010

Polym J

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In this study, we describe the first demonstration of well-ordered multilayer thin films of gold nanoparticles through a layer-bylayer (LbL) technique assisted by a polypeptide template. Anionic poly(L-glutamic acid) (PLGA)-modified gold nanoparticles were prepared as building units for LbL self-assembly. Two types of synthetic polymers, poly(L-lysine) (PLL) and poly(allylamine), were used as polycations that carry the same amino groups at the side chain, although the former is a polypeptide and the latter is a vinyl polymer. The deposition process and the resultant multilayer films were characterized by means of absorption, circular dichroism, Fourier transform infrared and atomic force microscopy measurements. Experimental results revealed that LbL multilayer properties, such as thickness, conformation of the peptide component, homogeneity and periodicity of nanoparticle layers, were significantly affected by the kind of polycations present. In particular, the combination of anionic PLGA-coated gold nanoparticles and cationic PLL induced b-sheet formation, which enabled the fabrication of a homogeneously well-packed gold nanoparticle multilayer without aggregation.

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Preparation of helical peptide monolayer-coated gold nanoparticles

Cited by 62 publications

References 16 publications

Facile green synthesis of gold nanoparticles with gum arabic as a stabilizing agent and reducing agent

Facile green synthesis of gold nanoparticles with gum arabic as a stabilizing agent and reducing agent

Modification of hydrophobic polypeptide-based film by blending with hydrophilic poly(acrylic acid)

Layer-by-layer fabrication of well-packed gold nanoparticle assemblies guided by a β-sheet peptide network

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