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Related Concept Videos

Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

293
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,...
293
Electrophoresis: Overview01:20

Electrophoresis: Overview

561
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...
561
Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

146
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...
146
Centrifugation01:05

Centrifugation

2.0K
Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
2.0K
Two-dimensional Gel Electrophoresis01:22

Two-dimensional Gel Electrophoresis

5.6K
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...
5.6K
Subcellular Fractionation01:32

Subcellular Fractionation

6.6K
The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation.
Differential Centrifugation
Differential centrifugation is...
6.6K

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Label-free Isolation and Enrichment of Cells Through Contactless Dielectrophoresis
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Multistage Cyclic Dielectrophoresis for High-Resolution Sorting of Submicron Particles.

Wenshen Luo1, Chaowen Zheng2, Cuimin Sun3

  • 1College of Mechanics, Guangxi University, 100 East University Road, Nanning 530004, China.

Micromachines
|April 26, 2025
PubMed
Summary
This summary is machine-generated.

A novel multistage cyclic dielectrophoresis (MC-DEP) technique precisely sorts submicron microspheres. This method significantly enhances microsphere monodispersity, reducing size variation for advanced applications.

Keywords:
dielectrophoresismultistage cycleprecise screeningsubmicrometer particle

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Area of Science:

  • Cross-disciplinary research at the intersection of materials science, chemical engineering, and biomedicine.
  • Nanotechnology and microscale particle manipulation.

Background:

  • Nanosized microspheres are crucial functional materials with broad applications.
  • Current preparation methods for monodisperse microspheres face technical challenges including complexity and high cost.

Purpose of the Study:

  • To develop an innovative technique for high-resolution sorting of submicron microspheres.
  • To overcome existing limitations in achieving microsphere monodispersity.

Main Methods:

  • Introduction of a multistage cyclic dielectrophoresis (MC-DEP) technique.
  • Utilizing a dielectrophoresis chip with a symmetric top-and-bottom electrode design for uniform dielectrophoretic force distribution.
  • Employing front-section focusing electrodes for preaggregation and back-section deflection electrodes for size sorting, with multiple cycles to refine size limits.

Main Results:

  • The MC-DEP technique successfully achieved high-resolution sorting of submicron microspheres.
  • Monodispersity of microspheres was significantly improved, with the coefficient of variation decreasing from 12.3% to 5.4% after three sorting cycles.
  • The symmetric electrode structure and multistage cycling enhanced sorting stability and reduced fluid environment perturbations.

Conclusions:

  • The proposed MC-DEP technique offers a superior solution for producing highly monodisperse microspheres.
  • This method addresses the technical bottlenecks of complex preparation and high costs associated with traditional techniques.
  • The enhanced monodispersity holds significant promise for advancing applications in biomedicine, chemical engineering, and materials science.