Direct Electrochemistry of Horseradish Peroxidase-Gold Nanoparticles Conjugate

Ahirwal, Gautham Kumar; Mitra, Chanchal K.

doi:10.3390/s90200881

Cited by 49 publications

(46 citation statements)

References 47 publications

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“…From this point of view an attractive and still unexplored domain is related to systems were inorganic nanoparticles interact with organic molecules or polymers having specific optoelectronic properties [4][5][6]. The variety of particles and polymers having exciting optical and/or electronic properties continuously grows, and several of them seem to have the necessary potential toward new developments [7][8][9][10]. This work aims at showing the interesting optical properties that could be obtained when both the inorganic nanoparticles and polymer are silicon-based structures.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence detection system based on silicon quantum dots–polysilane nanocomposites

Săcărescu¹,

Roman²,

Săcărescu³

et al. 2016

Express Polym. Lett.

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Abstract.A dual channel fluorescence system that combines the optical properties of silicon quantum dots-polysilane nanocomposites with those of 2-(4-chlorophenyl)-6-(thiophen-2-yl)pyridine, a fluorescent cytotoxic agent, is presented. The system is capable to alternatively trigger emission signals at two different wavelengths by excitation at a single wavelength. For this purpose a highly stable colloidal dispersion of silicon quantum dots-polysilane nanocomposite is prepared by a one-pot synthetic method using microwave-activated Wurtz coupling of organochlorosilanes. The size and shape of the silicon quantum dots within the polysilane thin film are studied by TEM. The colloidal dispersions are investigated by SAXS, which evidences that polysilane plays also a role as stabilizing agent to prevent aggregation. UV-vis spectrophotometry of the silicon quantum dots-polysilane nanocomposites in the presence of 2-(4-chlorophenyl)-6-(thiophen-2-yl)pyridine is used to define the active wavelength range and establish the fluorescence detection method.

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Section: Introductionmentioning

confidence: 99%

Fluorescence detection system based on silicon quantum dots–polysilane nanocomposites

Săcărescu¹,

Roman²,

Săcărescu³

et al. 2016

Express Polym. Lett.

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“…Thus the λ max appeared around 540-580 nm for GSH-and 560-620 nm for LA-decorated gold nanoparticles. The nanoparticles with different sizes led to the colloid with different colors, that is, the wine red color for the bare nanoparticles changed to blue for GSH-and dark blue for LA-decorated gold nanoparticles (Ahirwal & Mitra, 2009;Bakshi et al, 2010). The color of both GSH-and LA-stabilized nanoparticles did not change with time compared to the color of bare nanoparticles.…”

Section: Optical Propertiesmentioning

confidence: 90%

“…Figure 1. UV-Visible spectrum of (1) gold nanoparticles (AuNP), (2) GSH-AuNP, (3) LA-AuNP, (4) DNA-AuNP, (5) BSA-AuNP and (6) chitosan (Ahirwal & Mitra, 2009;Bakshi et al, 2010).…”

Section: Optical Propertiesmentioning

confidence: 99%

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

Capek¹

2016

IJC

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Hybrid nanoparticles of gold and silver can not only retain the beneficial features of both nanomaterials, but also possess unique advantages (synergism) over the other two types. Novel pseudospherical and anisotropic nanoparticles, bimetallic triangular nanoparticles, and core@shell nanoparticles were prepared by the different procedures for various applications and understanding both the particle evolution (nucleation) and nanoparticle anisotropy. Hybrid nanoparticles of gold and silver are considered to be low in toxicity, and exhibit facile surface functionalization chemistry. Furthermore, their absorption peaks are located in visible and near-infrared region. These nanoparticles provide significant plasmon tunability, chemical and surface modification properties, and significant advances in the growth into anisotropic nanostructures. The photoinduced synthesis can be used to prepare various (sub) nanoparticles and OD and 1D nanoparticles. Ostwald and digestive ripening provided narrower particle size distribution.Keywords: functional, hybrid, core@shell, bimetallic and (an) isotropic noble metal nanoparticles, Oswaldt and digestive ripening process IntroductionThe noble metal nanoparticle colloids were reported to exhibit a wide range of various applications from different fluids to in vitro and vivo as a carrier for drug delivery into cells and tissues to optical and magnetic manipulations in biomedical systems as well (Sun et al., 2000). The unique physical and chemical properties of nanoparticles are given by their large surface area or a large surface-to-volume ratio and high reactivity. The unique optical and magnetic properties of nanoparticles are controlled by the type of atoms (metals), composition of nanoparticles, particle shape, type and concentration of functional groups and so on (Feldmann, 2003). For example, the composite nanoparticles with the iron atoms domains generate the magnetism and with the gold atoms exhibit the unique optical features. Therefore such nanoparticles exhibit unique properties which mostly strongly differ from the bulk or classical materials.The future generation of environmental nanotechnologies based on noble metal nanoparticles is supposed to replace conventional environmental technologies by novel nano(bio)technologies (Modi, et al., 2003). Zero-and one-dimensional (0D and 1D) nanoparticles and two-and three (2D and 3D) nanoparticle assays belong to these unique nanomaterials. Especially the nanostructures decorated with different (bio) molecules are exceptional materials with nonconventional such as biomedical harvesting properties.Polymer-or biopolymer decorated metal nanoparticles are prepared by several procedures with and without templates. Most existing procedures explore the strong affinity of alkylthiol ligands and surfactants to gold and silver (Brust et al., 1994), the use of alkyl or aryl derivatives of disulfides (Shon et al., 2001), and thioethers (Li et al., 2001) as well. Furthermore, organic compounds with polar groups (Boal et al., 2000), t...

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“…In vitro applications for sensing and imaging purposes can be envisaged (Rosi & Mirkin 2005;Murphy et al 2008;Jumar Ahirawal & Mitra 2009;Lin et al 2009;Zhang et al 2009), whereas the in vivo aspect is related to therapeutic purposes such as drug delivery (Han et al 2007b), gene regulation (Rosi et al 2006;Seferos et al 2007) and cytostatics (Panyala et al 2009). Recent reviews provide an extended overview on this field of research (Jain et al 2008; .007 0.008 Figure 28.…”

Section: Aunps In Biological Environmentsmentioning

confidence: 99%

On the application potential of gold nanoparticles in nanoelectronics and biomedicine

Homberger

Simon

2010

Phil. Trans. R. Soc. A.

245

184

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Ligand-stabilized gold nanoparticles (AuNPs) are of high interest to research dedicated to future technologies such as nanoelectronics or biomedical applications. This research interest arises from the unique size-dependent properties such as surface plasmon resonance or Coulomb charging effects. It is shown here how the unique properties of individual AuNPs and AuNP assemblies can be used to create new functional materials for applications in a technical or biological environment. While the term technical environment focuses on the potential use of AuNPs as subunits in nanoelectronic devices, the term biological environment addresses issues of toxicity and novel concepts of controlling biomolecular reactions on the surface of AuNPs.

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Direct Electrochemistry of Horseradish Peroxidase-Gold Nanoparticles Conjugate

Cited by 49 publications

References 47 publications

Fluorescence detection system based on silicon quantum dots–polysilane nanocomposites

Fluorescence detection system based on silicon quantum dots–polysilane nanocomposites

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

On the application potential of gold nanoparticles in nanoelectronics and biomedicine

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