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Related Concept Videos

Electrogravimetric Analysis: Overview01:30

Electrogravimetric Analysis: Overview

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Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
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Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Coulometry: Overview01:00

Coulometry: Overview

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Coulometry is one of the rapid, most accurate, and precise analytical techniques that determine the quantity of an analyte by measuring the electrical charge needed for its complete electrolysis without using any analytical standards. The total charge passed during electrolysis correlates with the analyte amount by Faraday's laws of electrolysis. For accurate coulometric measurements, a charge equal to Faraday's constant multiplied by the number of electrons involved in the relevant...
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Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
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A Universal Electrode Approach for Automated Electrochemical Molecular Analyses.

Mandy L Y Sin1, Vincent Gau2, Joseph C Liao3

  • 1Aerospace and Mechanical Engineering, University of Arizona, Tucson, AZ 85721 USA. She is currently with the Department of Urology, Stanford University, Stanford, CA 94305 USA ( mandysin@stanford.edu ).

Journal of Microelectromechanical Systems : a Joint IEEE and ASME Publication on Microstructures, Microactuators, Microsensors, and Microsystems
|May 27, 2014
PubMed
Summary

A universal electrode approach integrates pumping, sample preparation, and sensing for automated microfluidic biosensing. This innovation enables rapid point-of-care diagnostics, like identifying urinary tract infections using bacterial 16S rRNA detection.

Keywords:
16S rRNAElectrochemical detectionElectrokineticsSystem IntegrationUrinary Tract Infection

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Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Biosensing

Background:

  • Microfluidics-based biosensing systems face challenges in clinical translation due to integration difficulties.
  • Automated microfluidic diagnostic systems require effective strategies for combining essential modules.

Purpose of the Study:

  • To develop a universal electrode approach for integrating pumping, sample preparation, and electrochemical sensing on a single microfluidic platform.
  • To automate complex molecular analysis for point-of-care biosensing applications.

Main Methods:

  • A novel universal electrode approach incorporating DC electrolytic pumping and AC electrokinetic sample preparation.
  • Electrochemical sensing utilizing self-assembled monolayers on the microfluidic platform.
  • Demonstration of integrated microfluidic operations including pumping, mixing, washing, and sensing.

Main Results:

  • Successful integration of multiple microfluidic operations onto a single platform.
  • Demonstrated detection of bacterial 16S rRNA for rapid urinary tract infection diagnostics.
  • The platform operates using only electronic interfaces, simplifying system integration.

Conclusions:

  • The universal electrode approach provides an effective strategy for integrating microfluidic modules.
  • This approach facilitates the realization of microfluidics for point-of-care molecular diagnostics.
  • Enables biosensing applications in non-traditional healthcare settings.