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Related Concept Videos

Voltammetric Techniques: Linear-Scan (E vs Time)01:12

Voltammetric Techniques: Linear-Scan (E vs Time)

Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
Voltammetry: Overview01:20

Voltammetry: Overview

Voltammetry is an electroanalytical technique in which the current flowing through an electrochemical cell is measured as a function of applied potential, typically under conditions of concentration polarization. The technique provides valuable information about redox-active species, and the current response is plotted as a voltammogram.
A voltammetric cell uses three electrodes: a working electrode, a reference electrode, and an auxiliary electrode. The redox reactions occur in the working...
Voltammetric Techniques: Pulse Voltammetry01:17

Voltammetric Techniques: Pulse Voltammetry

Differential-pulse voltammetry (DPV) is a type of voltammetry that involves applying a series of voltage pulses to an electrochemical cell while measuring the resulting current. In DPV, the differential pulse or small potential pulses are superimposed on a linear potential sweep. The magnitude of these pulses is typically small, often in the millivolt range. Each voltage pulse lasts a short duration, usually in the order of a few milliseconds, and is applied at regular intervals along the...
Voltammetric Techniques: Cyclic Voltammetry01:10

Voltammetric Techniques: Cyclic Voltammetry

Cyclic voltammetry (CV) is an electrochemical technique used to investigate the redox properties of a chemical species. It involves measuring the current response of an electrochemical cell as a function of the applied potential. The setup for cyclic voltammetry typically consists of a working electrode, a reference electrode, and a counter electrode—all immersed in an electrolyte solution. The working electrode is where the redox reaction of interest occurs, while the reference electrode...
Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...

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Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation
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Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation

Published on: September 19, 2017

Integrated digital microfluidic platform for voltammetric analysis.

Michael D M Dryden1, Darius D G Rackus, Mohtashim H Shamsi

  • 1Department of Chemistry, University of Toronto , 80 St. George Street, Toronto, Ontario M5S 3H6, Canada.

Analytical Chemistry
|September 5, 2013
PubMed
Summary
This summary is machine-generated.

Digital microfluidics (DMF) integrated with voltammetry offers automated microscale electroanalysis. This novel platform enhances analytical capabilities by eliminating external electrodes for precise sample manipulation and detection.

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Area of Science:

  • Electrochemistry
  • Microfluidics
  • Analytical Chemistry

Background:

  • Digital microfluidics (DMF) excels at automated liquid handling for analytical tasks.
  • Integration of DMF with electroanalytical methods is limited, often requiring external electrodes.

Purpose of the Study:

  • To develop a novel digital microfluidics platform with an integrated three-electrode electrochemical cell.
  • To overcome limitations of external electrodes in DMF-based electroanalysis.

Main Methods:

  • Microfabrication of a DMF device incorporating a three-electrode electrochemical cell.
  • Voltammetric analysis of discrete liquid droplets within the DMF device.
  • Automated generation of calibration series for acetaminophen.

Main Results:

  • The integrated DMF/voltammetry system demonstrated performance comparable to commercial screen-printed electrodes.
  • Achieved a limit of detection of 76 μM for acetaminophen with 4% average RSD.
  • Minimal human intervention required for analysis.

Conclusions:

  • The developed platform enables complete droplet control for microscale electroanalysis.
  • This integrated system offers a valuable alternative to existing inline analysis techniques for DMF.
  • Potential for broader applications in automated electrochemical assays.