Centrifugal Purification
Centrifugal Purification - Related Videos
03:05
Gradient Centrifugation Based Purification of Nuclei: A Technique to Obtain Ultrapure Fraction of Intact Nuclei Using Density Gradient Centrifugation
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2023
In this video, we describe a simple and efficient protocol using gradient centrifugation to isolate single nuclei. Once isolated, these nuclei can be used for sequencing and genome analysis.
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...
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...
06:39
Isolation and Purification of Bacterial Extracellular Vesicles from Human Feces Using Density Gradient Centrifugation
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Cited by 12 •
2023
This study describes a method to isolate and purify bacterial extracellular vesicles (BEVs) enriched from human feces via density gradient centrifugation (DGC), identifies the physical characteristics of BEVs from morphology, particle size, and concentration, and discusses the potential applications of the DGC approach in clinical and scientific research.
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...
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These properties influence how rapidly structures move through a centrifuged sample. Larger or denser components are more likely to collect in a pellet, whereas lighter components can remain suspended. Sedimentation behavior therefore determines which material becomes enriched in each fraction, allowing researchers to distinguish subcellular structures within homogenized neural tissue or cell preparations.
Sequential centrifugation applies controlled spins in stages, allowing one fraction to be collected before processing the remaining suspension further. Earlier steps can enrich larger or denser structures, while later steps separate material that stayed in suspension. This staged approach supports the preparation of relatively defined fractions for downstream biochemical, molecular, or imaging analyses.
A density gradient adds a structured separation environment in which components distribute according to their sedimentation behavior and density. Rather than relying only on one pellet and one suspension, researchers can recover fractions from different positions in the gradient. This can improve the separation of neural components such as membranes, mitochondria, nuclei, or synaptic vesicles.
Researchers first homogenize the neural tissue or cells to release subcellular components, then centrifuge the preparation under controlled conditions. They collect the resulting pellet or suspension, and may repeat the process through sequential spins or a density gradient. The recovered fractions can then undergo biochemical, molecular, or imaging analysis to examine their composition or localization.
Depending on the separation conditions, the method can enrich nuclei, mitochondria, synaptic vesicles, membranes, and other subcellular fractions. The relevant material is recovered either from a pellet or from a selected suspended or gradient fraction. This enrichment helps researchers analyze particular neural structures without relying solely on unfractionated tissue or cell homogenates.
It is useful when researchers need relatively defined neural fractions to investigate neuronal structure, signaling, protein localization, or disease-related cellular changes. Enriched components can support biochemical and molecular measurements, as well as imaging studies. By separating subcellular material before analysis, the technique connects cellular organization with the molecular features or changes being examined.