Membrane Centrifugation
Membrane Centrifugation - Related Videos
07:07
Working with Centrifuges
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2023
Source: Robert M. Rioux & Suprita Jharimune, Pennsylvania State University, University Park, PA Earth's gravitational force is capable of separating heterogeneous mixtures. However, many systems avert this type of separation owing to the length of time usually required in such cases. Centrifugation is one of the most powerful tools for the separation of heterogeneous mixtures1. It involves the application of centripetal force for sedimentation of the heavier phase, leading to separation of...
08:24
Nitrogen Cavitation and Differential Centrifugation Allows for Monitoring the Distribution of Peripheral Membrane Proteins in Cultured Cells
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Cited by 15 •
2017
Here we present protocols for detergent-free homogenization of cultured mammalian cells based on nitrogen cavitation and subsequent separation of cytosolic and membrane-bound proteins by ultracentrifugation. This method is ideal for monitoring the partitioning of peripheral membrane proteins between soluble and membrane fractions.
01:05
Centrifugation
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2024
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...
07:52
An Introduction to the Centrifuge
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2023
The centrifuge is an instrument used in nearly every research lab across the globe. Centrifugation is the process by which a centrifuge is used to separate components of a complex mixture. By spinning laboratory samples at very high speeds, the components of a given mixture are subjected to centrifugal force, which causes more dense particles to migrate away from the axis of rotation and lighter ones to move toward it. These particles can sediment at the bottom of the tube into what’s...
01:06
Centrifugal Force
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2023
Pseudo forces, or fictitious forces, appear to act on an object in motion in a rotating frame of reference with respect to an inertial reference frame. These forces are not real forces but rather mathematical constructs and are introduced to simplify calculations in a non-inertial frame while using Newton's laws of motion. Common examples of pseudo forces include centrifugal, Coriolis, and Euler forces. These forces are essential in fields such as mechanics, astrophysics, and fluid dynamics,...
FAQs
The semipermeable membrane acts as a size-based barrier. Liquid and smaller solutes can pass through during centrifugation, whereas larger molecules, molecular complexes, cells, or particles remain in the retentate. Consequently, the recovered fraction depends on the relative size of the sample components and the membrane’s ability to retain the material of interest.
Centrifugal force generates the pressure that drives the sample toward and through the membrane. This pressure allows liquid and smaller solutes to move across the barrier while retained material stays behind. The process therefore combines mechanical force with membrane selectivity, enabling separation and concentration without requiring large sample volumes.
Membrane Centrifugation can perform more than concentration because the membrane separates components according to size. Larger proteins, nucleic acids, complexes, cells, or particles may remain in the retentate while liquid and smaller solutes pass through. This selective behavior also supports buffer exchange, desalting, purification, and preparation for downstream analysis.
A typical workflow places the biological sample with a semipermeable membrane and subjects it to centrifugation. Rotation generates pressure, driving liquid and smaller solutes through the membrane. After spinning, the retained material and the passed-through fraction can be handled according to the experimental goal, such as concentration, buffer exchange, desalting, or purification.
Researchers may select this approach when they need to process relatively small volumes while concentrating or separating biological material by size. It is useful for proteins, nucleic acids, viruses, and other biomaterials, particularly when the sample must be prepared for later analysis. The same processing strategy can also support buffer exchange, desalting, or purification.
In biology and biotechnology, membrane centrifugation can prepare proteins, nucleic acids, viruses, and other biomaterials for downstream analysis. It also fits workflows in molecular biology, biochemistry, and cell research, where concentrating a sample or removing smaller solutes can make the resulting material more suitable for subsequent experimental examination.