Interparticle Coupling Effect on the Surface Plasmon Resonance of Gold Nanoparticles:  From Theory to Applications

Ghosh, Sujit Kumar; Pal, Tarasankar

doi:10.1021/cr0680282

Cited by 2,509 publications

(2,165 citation statements)

References 648 publications

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“…According to the 3σ rule, the detection limit for human IgG is calculated to be 100 pg/mL, which is at least 1 order of magnitude lower than that of other plasmonic methods 39−41 and even comparable with the results obtained from many sensitive electrochemical methods. 42−45 Additionally, compared to other nanoparticle-based ELISA methods, this method also exhibits many advantages: (1) it is easier to adapt to the conventional ELISA platforms directly, since ALP-labeled antibodies are commercially available; 21,45,53,54 (2) there is no false positive signal coming from nanoparticles autoaggregation, 37,54 as the signal does not come from nanoparticle aggregation; (3) it is label-free for AuNRs, making it much easier to operate; 37,54 and (4) AuNRs are much more stable to light, temperature, and biological thiol than silver nanoprims. 21,22 Determination of Human IgG in Fetal Bovine Serum.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Iodine-Mediated Etching of Gold Nanorods for Plasmonic ELISA Based on Colorimetric Detection of Alkaline Phosphatase

Zhang

Chen

Wang

et al. 2015

ACS Appl. Mater. Interfaces

171

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Here, we propose a plasmonic enzyme-linked immunosorbent assay (ELISA) based on highly sensitive colorimetric detection of alkaline phosphatase (ALP), which is achieved by iodine-mediated etching of gold nanorods (AuNRs). Once the sandwich-type immunocomplex is formed, the ALP bound on the polystyrene microwells will hydrolyze ascorbic acid 2-phosphate into ascorbic acid. Subsequently, iodate is reduced to iodine, a moderate oxidant, which etches AuNRs from rod to sphere in shape. The shape change of AuNRs leads to a blue-shift of longitudinal localized surface plasmon resonance. As a result, the solution of AuNRs changes from blue to red. Benefiting from the highly sensitive detection of ALP, the proposed plasmonic ELISA has achieved an ultralow detection limit (100 pg/mL) for human immunoglobulin G (IgG). Importantly, the visual detection limit (3.0 ng/mL) allows the rapid differential diagnosis with the naked eye. The further detection of human IgG in fetal bovine serum indicates its applicability to the determination of low abundance protein in complex biological samples.

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Section: ■ Results and Discussionmentioning

confidence: 99%

“…1 An obvious color change from red to blue can be induced by aggregation of AuNPs. 2 This property provides a simple platform for the colorimetric sensing of various targets.…”

Section: ■ Introductionmentioning

confidence: 99%

Iodine-Mediated Etching of Gold Nanorods for Plasmonic ELISA Based on Colorimetric Detection of Alkaline Phosphatase

Zhang

Chen

Wang

et al. 2015

ACS Appl. Mater. Interfaces

171

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“…[34][35][36][37] The extent of nanoparticle-induced biophysical and/or biochemical changes on cell membranes would be dependent on the size, charge, surface reactivity, surface chemistry and compositions of nanoparticles. [38][39][40][41][42] It has been studied that nanoparticles may introduce carcinogenic risks, which may be triggered by the production of reactive oxygen species (ROS) by macrophages attempting to destroy foreign materials on the inflammation sites. The ROS produced in this process, may cause DNA damage as well as inflammatory lesions associated with carcinogenesis.…”

Section: Nanoparticle -Membrane Interactionmentioning

confidence: 99%

Centrifugation-based assay for examining nanoparticle–lipid membrane binding and disruption

Bothun

2014

Analyst

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Physical disruption of cellular membranes arising from interactions with engineered nanoparticles is an important, but poorly understood aspect of nanotoxicology and nanomedicine. Model cellular membranes (i.e. lipid bilayers) can be used to identify interaction mechanisms, and most studies have largely focused on lipid bilayers supported on solid planar or spherical substrates. While useful and informative, these systems do not accurately represent an intact cell membrane because they restrict the elastic motion of the bilayer and the capacity for mechanical changes.Free standing bilayers are preferred, but add complexity. Given the importance of nanoparticle-membrane interactions in nanotoxicology and nanomedicine, and the vast range in nanoparticle composition, size, shape, and surface functionalization, there is a need to develop techniques that can rapidly and inexpensively analyze the membranenanoparticle activity by using free standing or unsupported membranes.This work develops a centrifugation-based assay that can analyze the membrane-nanoparticle activity as a function of nanoparticle surface functionalization, membrane lipid composition, and monovalent salt concentration (NaCl). Free standing, unsupported vesicles were used to gain relevant information on elastic membrane deformation and vesicle destabilization due to nanoparticle binding. Silver nanoparticles were chosen due to their widespread biological applications and surface plasmon resonance (SPR) properties. UV-vis based centrifugation assay, coupled with cryo-TEM and DLS analysis, was proposed to screen nanoparticle-membrane interactions; silver nanoparticles binding ratio RSPR was calculated as a function of Ag nanoparticle coating and vesicle composition. Study showed that strong electrostatic attraction led to significant sedimentation, vesicle / membrane disruption and higher RSPR value; in contrast, systems that exhibited weak or no electrostatic attraction did not show significant sedimentation, membrane disruption or high RSPR value. The centrifugation assay provides a rapid and straightforward way to screen nanoparticlemembrane interactions.iv ACKNOWLEDGMENTS

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“…These observed red‐shifts scattering from the coupling can be understood from generalized GMM theory 26, 27. The shift from the coupling between the SEPF core and 30 nm satellite particles is expected to increase linearly as more satellite particles are attached 73. However, the shift of 10 nm shown in Figure 4 is too large to be explained by the linear increase (Figure 4d).…”

Section: Resultsmentioning

confidence: 93%

Contact Transfer Printing of Side Edge Prefunctionalized Nanoplasmonic Arrays for Flexible microRNA Biosensor

et al. 2015

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For a nanoplasmonic approach of wearable biochip platform, understanding correlation between near‐field enhancement on nanostructures and sensing capability is a crucial step to improve the sensitivity in biosensing. A novel and effective method is demonstrated to increase sensitivity with the enhanced electric fields and to reduce noise with targeted functionalization enabled by transferring side edge prefunctionalized (SEPF) nanostructure arrays onto flexible substrates. Nanostructure sidewalls have selective biochemically functional terminals for the hybridization of microRNAs (miRNAs) and the immobilization of resonant nanoparticles, thus forming hetero assemblies of the nanostructure and the nanoparticles. The unique configuration has shown ultrasensitive biosensing of miRNA‐21 in a 10 × 10−15 m level by a red‐shift in scattering spectra induced by a plasmon coupling. This ultrasensitive SEPF nanostructure arrays are fabricated on a flexible substrate using a contact transfer printing with a release layer of trichloro(1H, 1H, 2H, 2H‐perfluorooctyl)silane. The introduction of the release layer at a prefunctionalizing step has proven to provide selective functionalization only on the sidewalls of the nanostructures. This reduces a background noise caused by the scattering from nonspecifically bound nanoparticles on the substrate, thus enabling reliable and precise detection.

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Interparticle Coupling Effect on the Surface Plasmon Resonance of Gold Nanoparticles: From Theory to Applications

Cited by 2,509 publications

References 648 publications

Iodine-Mediated Etching of Gold Nanorods for Plasmonic ELISA Based on Colorimetric Detection of Alkaline Phosphatase

Iodine-Mediated Etching of Gold Nanorods for Plasmonic ELISA Based on Colorimetric Detection of Alkaline Phosphatase

Centrifugation-based assay for examining nanoparticle–lipid membrane binding and disruption

Contact Transfer Printing of Side Edge Prefunctionalized Nanoplasmonic Arrays for Flexible microRNA Biosensor

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