Related Experiment Video
Updated: Jun 19, 2026

09:49
Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability
Published on: April 2, 2015
A METHOD FOR DETERMINING THE DIFFERENTIAL SEDIMENTATION OF PROTEINS IN THE HIGH SPEED CONCENTRATION CENTRIFUGE
T P Hughes1, E G Pickels, F L Horsfall
1Laboratories of the International Health Division, The Rockefeller Foundation, New York.
The Journal of Experimental Medicine
|October 30, 2009
Summary
This study introduces a novel method using a concentration centrifuge to measure protein sedimentation. The technique provides reproducible results for characterizing particle and protein behavior in solution.
Area of Science:
- Biochemistry
- Biophysics
- Analytical Chemistry
Background:
- Understanding particle and protein sedimentation is crucial in various scientific disciplines.
- Existing methods may have limitations in precision or applicability to complex mixtures.
Purpose of the Study:
- To develop and validate a method for quantifying the relative degree of sedimentation of proteins and small particles.
- To assess the reproducibility and characteristic nature of the sedimentation measurements.
Main Methods:
- Utilizing the Bauer and Pickels concentration centrifuge.
- Employing chemical analysis or biological assay on samples collected at different fluid levels.
- Using a specialized sampling device for precise sample collection.
Main Results:
- The method allows for the determination of relative sedimentation degrees for proteins and particles.
- Results demonstrated reproducibility within 10 percent.
- Sedimentation patterns were found to be characteristic for the investigated proteins.
Conclusions:
- The described method offers a reliable approach for studying sedimentation behavior.
- This technique is applicable to both pure substances and mixtures.
- The findings contribute to the characterization of protein and particle properties.
More Related Videos
Related Concept Videos
Centrifugation
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...
Subcellular Fractionation
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...
Differential Centrifugation
Differential centrifugation is...
Two-dimensional Gel Electrophoresis
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 as cells...
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 as cells...
SDS-PAGE
Gel electrophoresis is a method that separates biological macromolecules like nucleic acids or proteins by forcing them to pass through a gel matrix under an electric field.
A variation of gel electrophoresis, termed polyacrylamide gel electrophoresis (PAGE), is commonly used for separating proteins according to their molecular size by passing them through a polyacrylamide gel. Because of the varying charges associated with amino acid side chains, PAGE can be used to separate intact proteins...
A variation of gel electrophoresis, termed polyacrylamide gel electrophoresis (PAGE), is commonly used for separating proteins according to their molecular size by passing them through a polyacrylamide gel. Because of the varying charges associated with amino acid side chains, PAGE can be used to separate intact proteins...
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,...
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...

