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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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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 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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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.
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Principles Of Column Chromatography01:13

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The chromatography technique was first invented in 1901 by Michael S. Tswett, a Russian botanist, to separate plant pigments using organic solvents. Further, in 1941, Archer John Porter Martin and R. L. M. Synge modified the technique by packing silica gel into a column. A mixture of amino acids was then separated on the packed column using chloroform and water mixture as the mobile phase. This was the first report on column chromatography. At present, column chromatography is a widely used...
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Types Of Column Chromatography01:29

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The stability and compatibility of column material with samples are crucial for efficient purification in chromatographic techniques. Various operating parameters such as pH, temperature, or solvent affect the packing of the column material, thereby determining the purification efficiency. The choice of column material also plays an essential role in deciding the operating parameters and can be modified based on the proteins that need to be purified.
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Updated: Dec 31, 2025

Organic Solvent-Based Protein Precipitation for Robust Proteome Purification Ahead of Mass Spectrometry
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Centrifugal precipitation chromatography.

Yoichiro Ito1, Lin Qi

  • 1Bioseparation Technology Laboratory, Biochemistry and Biophysics Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892-1762, USA. itoy@nhlbi.nih.gov

Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
|June 23, 2009
PubMed
Summary

Centrifugal precipitation chromatography separates proteins by solubility using a unique countercurrent ammonium sulfate gradient. This method enables precise separation and purification of various biological molecules.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Chromatography

Background:

  • Traditional chromatography methods face challenges in separating complex biological mixtures.
  • Precipitation-based separation techniques require optimization for efficiency and resolution.

Purpose of the Study:

  • To introduce and validate a novel centrifugal precipitation chromatography (CPC) technique.
  • To demonstrate CPC's efficacy in separating analytes based on differential solubility.

Main Methods:

  • CPC utilizes a countercurrent elution system with ammonium sulfate (AS) and water in spiral channels separated by a membrane.
  • Analytes precipitate at a critical AS concentration and redissolve as the gradient changes, enabling stepwise separation.
  • Centrifugal force aids in analyte precipitation and retention within the channel bed.

Main Results:

  • The method successfully separated various analytes, including human serum proteins, enzymes, DNA, and polysaccharides.
  • CPC demonstrated the ability to isolate target proteins using affinity or immunoaffinity ligands.
  • Separation occurs in the order of analyte solubility in the AS solution.

Conclusions:

  • Centrifugal precipitation chromatography offers a powerful new approach for high-resolution separation of biomolecules.
  • The technique is versatile and applicable to a wide range of analytes, including complex biological samples.
  • CPC provides an effective method for protein purification and characterization.