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Related Concept Videos

Electrophoresis: Overview01:20

Electrophoresis: Overview

1.5K
Electrophoresis is a powerful analytical separation technique that relies on the differential migration of charged species when subjected to an electric field. The core strength of electrophoresis lies in its ability to separate high-molecular-weight species in complex mixtures. It has found widespread use in biochemistry, molecular biology, and analytical chemistry, allowing the separation of compounds like amino acids, nucleotides, carbohydrates, and proteins with excellent resolution.
There...
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Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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Two-dimensional Gel Electrophoresis01:22

Two-dimensional Gel Electrophoresis

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Two-dimensional gel electrophoresis is a high-resolution protein separation method first introduced by O' Farrell and Klose in 1975. This method involves protein separation by two dimensions, mass and charge, making it more accurate than one-dimensional gel electrophoresis.
The first dimension separation uses the isoelectric focusing or IEF technique performed on immobilized pH gradient (IPG) strips that separate proteins according to their isoelectric points.
Biological samples, such...
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Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

181
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...
181
DNA Agarose Gel Electrophoresis02:35

DNA Agarose Gel Electrophoresis

96.0K
Agarose gel electrophoresis is a laboratory technique commonly used to separate DNA fragments by size. However, it can also be used to isolate and purify DNA fragments using a gel extraction protocol.
Gel extraction follows five major steps: running gel electrophoresis to separate fragments, isolating the individual bands, extracting DNA from those bands, and removing the dye and salts from the extracted mixture to obtain pure DNA.
In cloning experiments, both the insert and vector DNA...
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SDS-PAGE01:27

SDS-PAGE

27.4K
Gel electrophoresis is a method that separates biological macromolecules like nucleic acids or proteins by forcing them to pass through a gel matrix under an electric field.
A variation of gel electrophoresis, termed  polyacrylamide gel electrophoresis (PAGE), is commonly used for separating proteins according to their molecular size by passing them through a polyacrylamide gel. Because of the varying charges associated with amino acid side chains, PAGE can be used to separate intact...
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Label-free Isolation and Enrichment of Cells Through Contactless Dielectrophoresis
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When to Use Rectangular Waveforms in Dielectrophoresis Application to Increase Separation and Sorting Efficiency.

Niklas P Boldt1, Laura Weirauch2, Jana M Späth1,3

  • 1Chair of Sensor and Actuator Systems, Faculty of EECS, TU Berlin, Berlin, Germany.

Electrophoresis
|November 28, 2024
PubMed
Summary
This summary is machine-generated.

Rectangular waveforms can improve dielectrophoretic (DEP) separation efficiency by utilizing signal harmonics. However, improper waveform conditions can decrease the dielectrophoretic force, impacting microparticle sorting.

Keywords:
cross‐over frequencydielectrophoresisharmonicsmicrofluidicmicroparticlewaveform

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Area of Science:

  • Electrical Engineering
  • Biophysics
  • Microfluidics

Background:

  • Dielectrophoresis (DEP) is a technique used for manipulating and separating microparticles based on their dielectric properties.
  • Traditional DEP often utilizes sinusoidal waveforms, but alternative waveforms like rectangular signals offer potential advantages and challenges.
  • Understanding waveform effects is crucial for optimizing DEP-based separation and sorting processes.

Purpose of the Study:

  • To investigate the impact of rectangular waveforms on the efficiency of dielectrophoretic separation and sorting.
  • To identify conditions under which rectangular waveforms enhance or diminish DEP force.
  • To explore the role of signal harmonics and frequency-dependent behavior in DEP processes.

Main Methods:

  • Conducted microparticle-focusing experiments using a microfluidic channel with a pair of electrodes.
  • Performed separation experiments utilizing a macroscopic insulator-based dielectrophoretic filter.
  • Analyzed the influence of rectangular waveform harmonics and their contribution to the DEP force.

Main Results:

  • Harmonics in rectangular signals can enhance separation and sorting efficiency compared to sinusoidal waveforms when contributing constructively to the DEP force.
  • The positive effect is contingent upon the ratio of the fundamental frequency to the cross-over frequency within the Clausius-Mossotti factor.
  • Deviations from derived boundary conditions result in detrimental effects, leading to a reduction in the net DEP force.

Conclusions:

  • Rectangular waveforms offer a tunable parameter (harmonics) for optimizing dielectrophoretic separation.
  • Careful consideration of frequency ratios and boundary conditions is essential to harness the benefits of rectangular waveforms in DEP.
  • This study provides insights into waveform engineering for improved microparticle manipulation in DEP systems.