scholarly journals Facile Histamine Detection by Surface-Enhanced Raman Scattering Using SiO2@Au@Ag Alloy Nanoparticles

2020 ◽  
Vol 21 (11) ◽  
pp. 4048 ◽  
Author(s):  
Kim-Hung Huynh ◽  
Xuan-Hung Pham ◽  
Eunil Hahm ◽  
Jaehyun An ◽  
Hyung-Mo Kim ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Limit Of Detection ◽  
Volume Ratio ◽  
Surface Enhanced Raman Scattering ◽  
Tween 20 ◽  
Histamine Concentration ◽  
Gold Silver ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Histamine intoxication associated with seafood consumption represents a global health problem. The consumption of high concentrations of histamine can cause illnesses ranging from light symptoms, such as a prickling sensation, to death. In this study, gold–silver alloy-embedded silica (SiO2@Au@Ag) nanoparticles were created to detect histamine using surface-enhanced Raman scattering (SERS). The optimal histamine SERS signal was measured following incubation with 125 μg/mL of SiO2@Au@Ag for 2 h, with a material-to-histamine solution volume ratio of 1:5 and a phosphate-buffered saline-Tween 20 (PBS-T) solvent at pH 7. The SERS intensity of the histamine increased proportionally with the increase in histamine concentration in the range 0.1–0.8 mM, with a limit of detection of 3.698 ppm. Our findings demonstrate the applicability of SERS using nanomaterials for histamine detection. In addition, this study demonstrates that nanoalloys could have a broad application in the future.

scholarly journals Direct Detection of Toxic Contaminants in Minimally Processed Food Products Using Dendritic Surface-Enhanced Raman Scattering Substrates

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2726 ◽  
Author(s):  
Hannah Dies ◽  
Maria Siampani ◽  
Carlos Escobedo ◽  
Aristides Docoslis
Keyword(s):  
Raman Scattering ◽  
Limit Of Detection ◽  
Screening Method ◽  
Food Products ◽  
Surface Enhanced Raman Scattering ◽  
Liquid Food ◽  
Minimally Processed ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

We present a method for the surface-enhanced Raman scattering (SERS)-based detection of toxic contaminants in minimally processed liquid food products, through the use of a dendritic silver nanostructure, produced through electrokinetic assembly of nanoparticles from solution. The dendritic nanostructure is produced on the surface of a microelectrode chip, connected to an AC field with an imposed DC bias. We apply this chip for the detection of thiram, a toxic fruit pesticide, in apple juice, to a limit of detection of 115 ppb, with no sample preprocessing. We also apply the chip for the detection of melamine, a toxic contaminant/food additive, to a limit of detection of 1.5 ppm in milk and 105 ppb in infant formula. All the reported limits of detection are below the recommended safe limits in food products, rendering this technique useful as a screening method to identify liquid food with hazardous amounts of toxic contaminants.

Hollow Gold−Silver Double-Shell Nanospheres:  Structure, Optical Absorption, and Surface-Enhanced Raman Scattering

2008 ◽  
Vol 112 (16) ◽  
pp. 6319-6329 ◽  
Author(s):  
Tammy Y. Olson ◽  
Adam M. Schwartzberg ◽  
Christine A. Orme ◽  
Chad E. Talley ◽  
Breanna O'Connell ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Gold Silver ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

scholarly journals Electrokinetically-Driven Assembly of Gold Colloids into Nanostructures for Surface-Enhanced Raman Scattering

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 661 ◽  
Author(s):  
Hannah Dies ◽  
Adam Bottomley ◽  
Danielle Lilly Nicholls ◽  
Kevin Stamplecoskie ◽  
Carlos Escobedo ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Ionic Composition ◽  
Surface Enhanced Raman Scattering ◽  
Gold Nanostructures ◽  
Field Frequency ◽  
Gold Colloids ◽  
Gold Silver ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Surface-enhanced Raman scattering (SERS) enables the highly sensitive detection of (bio)chemical analytes in fluid samples; however, its application requires nanostructured gold/silver substrates, which presents a significant technical challenge. Here, we develop and apply a novel method for producing gold nanostructures for SERS application via the alternating current (AC) electrokinetic assembly of gold nanoparticles into two intricate and frequency-dependent structures: (1) nanowires, and (2) branched “nanotrees”, that create extended sensing surfaces. We find that the growth of these nanostructures depends strongly on the parameters of the applied AC electric field (frequency and voltage) and ionic composition, specifically the electrical conductivity of the fluid. We demonstrate the sensing capabilities of these gold nanostructures via the chemical detection of rhodamine 6G, a Raman dye, and thiram, a toxic pesticide. Finally, we demonstrate how these SERS-active nanostructures can also be used as a concentration amplification device that can electrokinetically attract and specifically capture an analyte (here, streptavidin) onto the detection site.

Surface-Enhanced Raman Scattering Fiber-Optic Sensor

1990 ◽  
Vol 44 (1) ◽  
pp. 63-69 ◽  
Author(s):  
J. M. Bello ◽  
T. Vo-Dinh
Keyword(s):  
Raman Scattering ◽  
Fiber Optic ◽  
Limit Of Detection ◽  
Spectral Characteristics ◽  
Surface Enhanced Raman Scattering ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

A fiber-optic system was developed for exciting and collecting surface-enhanced Raman scattering (SERS) signals generated from a sensing plate tip having silver-coated microparticles deposited on a glass support. Various fiber parameters, such as fiber type, fiber-substrate geometry, and other experimental parameters, were investigated to obtain the optimum conditions for the SERS fiber-optic device. In addition, analytical figures of merit relevant to the performance of the SERS fiber-optic sensor, such as SERS spectral characteristics, reproducibility, linear dynamic range, and limit of detection, were also investigated.

scholarly journals Extrinsic surface-enhanced Raman scattering detection of influenza A virus enhanced by two-dimensional gold@silver core–shell nanoparticle arrays

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 97791-97799 ◽  
Author(s):  
Kullavadee Karn-orachai ◽  
Kenji Sakamoto ◽  
Rawiwan Laocharoensuk ◽  
Suwussa Bamrungsap ◽  
Sirirurg Songsivilai ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Influenza A ◽  
Surface Enhanced Raman Scattering ◽  
Nanoparticle Arrays ◽  
Direct Immunoassay ◽  
Gold Silver ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
2D Array

A surface enhanced Raman scattering (SERS) based biosensor using a direct immunoassay platform was demonstrated for influenza A detection. The sensitivity was improved ~4 times by using a well-tuned Au@Ag 2D array instead of a flat Au film.

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