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Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Colloids03:22

Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Colloids and Suspensions01:17

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Concentration Cells02:41

Concentration Cells

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A concentration cell is a type of a  voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
Consider the following voltaic cell:
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Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
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Detection of Histamine Dihydrochloride at Low Concentrations Using Raman Spectroscopy Enhanced by Gold Nanostars

Eleazar Samuel Kolosovas-Machuca1, Alexander Cuadrado2,3, Hiram Joazet Ojeda-Galván4,5

  • 1Coordinación para la Innovación y Aplicación de la Ciencia y la Tecnología, Universidad Autónoma de San Luis Potosí, 78210 San Luis Potosí, Mexico. samuel.kolosovas@uaslp.mx.

Nanomaterials (Basel, Switzerland)
|February 10, 2019
PubMed
Summary

This study introduces a rapid method for detecting histamine dihydrochloride using gold nanostars for Surface-Enhanced Raman Spectroscopy (SERS). The technique achieves high sensitivity, enabling detection of low amine molecule concentrations.

Keywords:
SERScomputational electromagnetismhistaminenanophotonicsnanostars

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Area of Science:

  • Nanotechnology
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Histamine detection is crucial in biomedicine and food safety.
  • Developing sensitive and rapid detection methods is an ongoing challenge.
  • Gold nanoparticles offer unique plasmonic properties for sensing applications.

Purpose of the Study:

  • To develop a fast and easy method for detecting histamine dihydrochloride.
  • To utilize gold nanostars as a highly active Surface-Enhanced Raman Spectroscopy (SERS) platform.
  • To evaluate the potential applications in biomedicine and food science.

Main Methods:

  • Characterization of gold nanostar colloid using Scanning Electron Microscopy (SEM) and UV-Vis spectroscopy.
  • Numerical calculations to estimate plasmonic resonance and electric field amplification.
  • Application of SERS for detecting histamine dihydrochloride in aqueous solutions of varying concentrations.

Main Results:

  • Gold nanostars demonstrated high activity as a SERS platform.
  • Numerical calculations provided insights into nanoparticle plasmonics.
  • SERS successfully amplified the Raman signal of histamine by an enhancement factor of 1.0 × 10^7.

Conclusions:

  • The developed method is capable of detecting low concentrations of histamine dihydrochloride.
  • Gold nanostars are effective for sensitive SERS-based detection.
  • The method holds promise for applications in biomedicine and food safety analysis.