Linear aggregation of gold nanoparticles in ethanol

Liao, Jianhui; Yu, Wei; Xu, Lina; Ge, Cunwang; Liu, Jinhong; Gu, Ning

doi:10.1016/s0927-7757(03)00156-0

Cited by 210 publications

(171 citation statements)

References 22 publications

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“…Tannic acid is a natural polyphenolic reducer belonging to the group of hydrolysable tannins, which contain glucose esterified by gallic acid in the central core. [36] Due to reducing and stabilising properties, tannic acid is often used for the synthesis of nanoparticles of gold, [37,38] silver [39,40] and nickel. [41] The additional advantage of tannic acid is that it is a natural antioxidant exhibiting also antiviral activity.…”

Section: Discussionmentioning

confidence: 99%

Gold nanoparticles and ions – friends or foes? As they are seen by human cells U-937 and HL-60

Barbasz

Oćwieja

2015

Journal of Experimental Nanoscience

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Gold nanoparticles (AuN) are one of the most investigated nanomaterials, finding numerous applications from medicine to industry. AuN were obtained by reduction of gold salts using tannic acid as a reducing agent. To detach the impact of AuN onto cells of two lines human monocytic cells (U-937) and human promyelocytic leukaemia cells (HL-60), the effects of postreaction residues (of effluent from sol cleaning) and gold ions were also examined. It was demonstrated that resistance of cells to the toxic action of AuN is dependent not only on incubation time and dosage, but also on stages of cell differentiation. It was found that after incubation of promonocytes U-937 with 25 ppm AuN, the cell viability decreased by 25% and of macrophages by 50%. Differentiated cells U-937 showed a significantly lower resistance than the not-differentiated cells. For HL-60 cells, regardless of differentiation, cell viability decreased by approximately 20% after treatment with 25 ppm AuN sol. It was noticed that U-937 exhibited higher vulnerability to AuN than HL-60 cells. It was proved that AuN induced over a 15-fold increase in nitric oxide and a decrease of intracellular glutathione levels indicating the inflammatory response of cells. Even though gold ions did not show a significant effect on cell viability, they caused fivefold increase of nitric oxide level. The results show a higher cytotoxicity of AuN than gold ions. An overall picture of the interaction of AuN with human cells of first defence line was obtained. The results indicate that AuN may cause changes in the response of phagocytes in inflammatory conditions.

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Section: Discussionmentioning

confidence: 99%

Gold nanoparticles and ions – friends or foes? As they are seen by human cells U-937 and HL-60

Barbasz

Oćwieja

2015

Journal of Experimental Nanoscience

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“…So far, it has been shown that one-dimensional (1D) gold NP (AuNP) structures can be achieved by template-free assemblies such as chemical bonding 13,14 , hydrogen bonding 15 , electrostatic forces and van der Waals forces. Such assemblies have been induced by small organic molecules, for example, mercaptoethanol 16 and destabilizing agents as salt 17 or ethanol 18 . Recently, bioinspired approaches utilizing the advantages of biological constituents for template-based assembly of nanoarchitectures have gained considerable attention 19,20 .…”

mentioning

confidence: 99%

Molecular protein adaptor with genetically encoded interaction sites guiding the hierarchical assembly of plasmonically active nanoparticle architectures

et al. 2015

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The control over the defined assembly of nano-objects with nm-precision is important to create systems and materials with enhanced properties, for example, metamaterials. In nature, the precise assembly of inorganic nano-objects with unique features, for example, magnetosomes, is accomplished by efficient and reliable recognition schemes involving protein effectors. Here we present a molecular approach using protein-based 'adaptors/ connectors' with genetically encoded interaction sites to guide the assembly and functionality of different plasmonically active gold nanoparticle architectures (AuNP). The interaction of the defined geometricaly shaped protein adaptors with the AuNP induces the self-assembly of nanoarchitectures ranging from AuNP encapsulation to one-dimensional chain-like structures, complex networks and stars. Synthetic biology and bionanotechnology are applied to co-translationally encode unnatural amino acids as additional site-specific modification sites to generate functionalized biohybrid nanoarchitectures. This protein adaptor-based nanoobject assembly approach might be expanded to other inorganic nano-objects creating biohybrid materials with unique electronic, photonic, plasmonic and magnetic properties.

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“…20 Moreover, the ALP nanofibers form self-supporting gels in ethanol (Figure 1a). 21,22 The structural properties and corresponding surface plasmon resonance (SPR) characteristics of the nanostructures were examined by TEM imaging and UV spectrophotometer to study the appropriate ratio of the peptide and KAuCl 4 . After one week of incubation at room temperature, particle formation around the peptide nanofibers was observed.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Self-Assembled Peptide Nanofiber Templated One-Dimensional Gold Nanostructures Exhibiting Resistive Switching

et al. 2012

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An amyloid-like peptide molecule self-assembling into one-dimensional nanofiber structure in ethanol was designed and synthesized with functional groups that can bind to gold ions. The peptide nanofibers were used as templates for nucleation and growth of one-dimensional gold nanostructures in the presence of ascorbic acid as reducing agent. We performed multistep seed-mediated synthesis of gold nanoparticles by changing peptide/gold precursor and peptide/ reducing agent ratios. Gold nanostructures with a wide range of morphologies such as smooth nanowires, noodle-like onedimensional nanostructures, and uniform aggregates of spherical nanoparticles were synthesized by use of an environmentally friendly synthesis method. Nanoscale electrical properties of gold-peptide nanofibers were investigated using atomic force microscopy. Bias dependent current (IV) measurements on thin films of gold-peptide nanofiber hybrid revealed tunneling dominated transport and resistive switching. Gold-peptide nanofiber composite nanostructures can provide insight into electrical conduction in biomolecular/inorganic composites, highlighting their potential applications in electronics and optics.

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Linear aggregation of gold nanoparticles in ethanol

Cited by 210 publications

References 22 publications

Gold nanoparticles and ions – friends or foes? As they are seen by human cells U-937 and HL-60

Gold nanoparticles and ions – friends or foes? As they are seen by human cells U-937 and HL-60

Molecular protein adaptor with genetically encoded interaction sites guiding the hierarchical assembly of plasmonically active nanoparticle architectures

Self-Assembled Peptide Nanofiber Templated One-Dimensional Gold Nanostructures Exhibiting Resistive Switching

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