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Related Concept Videos

Redox Reactions01:24

Redox Reactions

Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
Redox Reactions01:27

Redox Reactions

Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Microbial Biosensors

Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
Redox Titration: Overview01:21

Redox Titration: Overview

Redox titration is a chemical analysis technique used to determine the concentration of an unknown substance by measuring the electron transfer in a redox (reduction-oxidation) reaction. The process involves gradually adding a titrant with a known concentration of an oxidizing or reducing agent, to the analyte, the solution with an unknown concentration, until reaching the endpoint, which indicates the completion of the reaction between the two substances. Ensuring the analyte is in a single...
Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...

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Redox molecule based SERS sensors.

Nicolás G Tognalli1, Pablo Scodeller, Victoria Flexer

  • 1Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, 8400 S. C. de Bariloche, Río Negro, Argentina.

Physical Chemistry Chemical Physics : PCCP
|August 20, 2009
PubMed
Summary
This summary is machine-generated.

We developed a novel nanobiosensor framework using wired enzymes and SERS nanoparticles for sensitive detection. This biosensor enables remote, amplified optical signals for molecular targets like glucose.

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Area of Science:

  • Nanotechnology
  • Biosensing
  • Spectroscopy

Background:

  • Developing sensitive and selective biosensors is crucial for early disease detection and monitoring.
  • Existing biosensors often face limitations in sensitivity, remote interrogation, and signal amplification.

Purpose of the Study:

  • To present a general framework for designing nanobiosensors.
  • To integrate wired enzymes, redox molecules, and SERS nanoparticles for enhanced optical detection.
  • To demonstrate a proof-of-concept glucose sensor with millimolar sensitivity.

Main Methods:

  • Utilizing wired enzymes coupled to redox molecules and SERS Au core-shell nanoparticles.
  • Employing resonant Raman scattering and surface plasmon amplification for signal generation.
  • Investigating redox molecule electronic states and flavin biomimetic systems via spectro-electrochemistry.
  • Analyzing optical constants and electronic resonances using multiple sample spectroscopic ellipsometry.

Main Results:

  • Demonstrated remote interrogation of nanobiosensors through redox molecule spectral variations.
  • Showcased Raman scattering sensitivity to oxidation state changes in flavin systems.
  • Confirmed the self-contained nature of molecular recognition and signal amplification components.
  • Developed a compact SERS sensor capable of detecting glucose at millimolar concentrations.

Conclusions:

  • The proposed nanobiosensor framework offers a versatile platform for sensitive and selective molecular detection.
  • The integration of SERS nanoparticles and wired enzymes enables amplified optical signals for remote sensing.
  • This technology holds promise for developing advanced diagnostic and monitoring tools.