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Related Concept Videos

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...
High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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,...
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
Electrophoresis: Overview01:20

Electrophoresis: Overview

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.
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On-chip Isotachophoresis for Separation of Ions and Purification of Nucleic Acids
10:32

On-chip Isotachophoresis for Separation of Ions and Purification of Nucleic Acids

Published on: March 2, 2012

High-sensitivity detection using isotachophoresis with variable cross-section geometry.

Supreet S Bahga1, Govind V Kaigala, Moran Bercovici

  • 1Department of Mechanical Engineering, Stanford University, CA, USA.

Electrophoresis
|February 11, 2011
PubMed
Summary
This summary is machine-generated.

This study enhances Ion-Channel Separation (ITP) assay sensitivity by optimizing channel geometry. Convergent channels significantly boost sensitivity and reduce assay time, offering practical design guidelines for microfluidic devices.

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Highly Sensitive and Quantitative Detection of Proteins and Their Isoforms by Capillary Isoelectric Focusing Method
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Last Updated: Jun 4, 2026

On-chip Isotachophoresis for Separation of Ions and Purification of Nucleic Acids
10:32

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Published on: March 2, 2012

Highly Sensitive and Quantitative Detection of Proteins and Their Isoforms by Capillary Isoelectric Focusing Method
07:58

Highly Sensitive and Quantitative Detection of Proteins and Their Isoforms by Capillary Isoelectric Focusing Method

Published on: September 19, 2018

Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Biotechnology

Background:

  • Ion-channel separation (ITP) is a powerful technique for analyte separation.
  • Improving ITP assay sensitivity and reducing analysis time are critical for practical applications.
  • Current ITP methods face limitations in sensitivity and speed, necessitating optimization strategies.

Purpose of the Study:

  • To theoretically and experimentally investigate the impact of channel cross-section variations on ITP assay sensitivity.
  • To develop a predictive model for plateau-mode ITP in channels with axially varying cross-sections.
  • To provide guidelines for optimizing microfluidic chip geometry for enhanced ITP performance.

Main Methods:

  • Development of a simple, unsteady, diffusion-free model for ITP in varying cross-section channels.
  • Incorporation of detailed chemical equilibrium calculations into the ITP model.
  • Validation of the theoretical model using numerical simulations and experimental studies.
  • Experimental variation of channel geometry and analyte concentrations to assess ITP performance.

Main Results:

  • Strongly convergent channel designs significantly increase ITP assay sensitivity compared to uniform channels.
  • Convergent channels lead to a simultaneous reduction in assay time.
  • Demonstrated indirect fluorescence detection sensitivity of 100 nM using convergent channels.
  • Derived analytical relations for zone length and assay time dependence on channel geometry.

Conclusions:

  • Optimizing channel geometry, specifically using convergent designs, is an effective strategy to enhance ITP assay sensitivity and efficiency.
  • The developed theoretical model accurately predicts ITP behavior in varying cross-section channels.
  • The findings offer practical guidance for designing high-performance ITP microfluidic devices.