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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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Overview Of Cell Separation And Isolation01:20

Overview Of Cell Separation And Isolation

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Cell separation was first achieved in 1964 by S. H. Seal, who separated large tumor cells from the smaller blood cells using filtration. Two years later, Pohl and Hawk performed experiments on how cells respond differently to a nonuniform electric field based on the cell type. Such observations were the inception of cell separation methods, which allow isolating a single cell type from a heterogeneous sample.
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Centrifugation01:05

Centrifugation

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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...
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Subcellular Fractionation01:32

Subcellular Fractionation

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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...
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Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

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In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
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Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

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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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Protein separation under a microfluidic regime.

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Lab-on-a-Chip (LoC) technology shows promise for protein and nucleic acid separation. While advances in microfluidic devices are significant, commercial protein purification products are still limited, highlighting future development needs.

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Area of Science:

  • Biotechnology
  • Analytical Chemistry
  • Microfluidics

Background:

  • Lab-on-a-Chip (LoC) and micro-Total Analysis Systems (μTAS) are powerful analytical technologies.
  • Significant progress has been made in separating nucleic acids and proteins using microfluidic devices.

Purpose of the Study:

  • To review the latest advances in microfluidic systems for biological macromolecule separation.
  • To critically assess the future development of standardized microfluidic systems and protocols.
  • To present an outlook on current needs and future applications.

Main Methods:

  • Review of recent literature on microfluidic component fabrication.
  • Analysis of detection methods for microfluidic separation.
  • Evaluation of commercial implementation of microfluidic devices for biomolecule separation.

Main Results:

  • Electrophoretic microfluidic devices demonstrate remarkable progress in nucleic acid and protein separation.
  • Miniaturized chromatography principles are applied in pint-size devices for protein isolation.
  • Advances in fabrication, detection, and commercialization are discussed.

Conclusions:

  • Microfluidic systems offer high potential for biological macromolecule separation.
  • Standardization of microfluidic systems and protocols is crucial for market availability.
  • Future applications and current needs in protein purification are identified.