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Related Concept Videos

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.
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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Capillary Electrophoresis: Instrumentation01:20

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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...
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Electrophoresis: Overview01:20

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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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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.
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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Cation-selective electropreconcentration.

Il Hyung Shin1, Ki-Jung Kim, Jiman Kim

  • 1Department of Biomedical Engineering, Seoul National University, 28 Yongon-dong, Chongno-gu, Seoul, South Korea. hckim@snu.ac.kr.

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|April 16, 2014
PubMed
Summary
This summary is machine-generated.

This study presents a microfluidic system for concentrating cations using reversed electroosmotic flow (EOF) and anion-selective filters. Three fabrication methods were compared, with TMSVE and polyE-323 coatings showing robust preconcentration for peptides and proteins.

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Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Separation Science

Background:

  • Microfluidic devices offer advantages for sample analysis but often require preconcentration steps.
  • Efficient preconcentration of cationic analytes like peptides and proteins remains a challenge in microfluidic systems.

Purpose of the Study:

  • To develop and evaluate a cation-selective microfluidic sample preconcentration system.
  • To compare three different fabrication methods for anion-permselective filters within the microfluidic device.
  • To assess the performance of the preconcentration system for cationic dyes, peptides, and proteins.

Main Methods:

  • Fabrication of anion-permselective filters using poly(diallyldimethylammonium chloride) (PDADMAC) membrane, N-[3-(trimethoxysilyl)propyl]-N'-(4-vinylbenzyl)ethylenediamine hydrochloride (TMSVE) coating, and polyE-323 coating.
  • Utilizing reversed electroosmotic flow (EOF) and electric double layer (EDL) overlap for cation preconcentration.
  • Investigating preconcentration efficiency, buffer concentration and pH dependence, flow rate tolerance, and sample adsorption using fluorescent dyes and TRITC-tagged peptides/proteins.

Main Results:

  • Both TMSVE- and polyE-323-coated nanochannels demonstrated robust preconcentration at high flow rates.
  • The PDADMAC membrane maintained anion-permselectivity at higher buffer concentrations.
  • TMSVE coatings provided a more stable preconcentration process, while polyE-323 coatings exhibited lower peptide adsorption and consistent efficiency across various buffer pHs.

Conclusions:

  • The developed cation-selective microfluidic system effectively preconcentrates cationic analytes.
  • Different fabrication methods offer distinct advantages in terms of performance and stability.
  • This system holds potential for preconcentrating cationic peptides and proteins in microfluidic devices for downstream analysis.