Centrifugation Technique
Centrifugation Technique - 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...
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.
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
Separation depends on how readily particles move through the liquid under centrifugal force. Denser components travel more rapidly than less-dense components, so they concentrate at the tube bottom while other material remains in the liquid above. This physical difference allows researchers to distinguish and recover biological components from a mixed sample.
Rotor design, speed, and duration influence how effectively components separate during centrifugation. These variables control the forces applied to the sample and the time available for particles to move through the liquid. Changing them can alter the amount of material collected in the pellet and the composition of the remaining supernatant.
The pellet is the concentrated material collected at the bottom of the tube after denser components move through the liquid. The supernatant is the liquid layer above it, containing material that did not collect in the pellet. Depending on the experiment, researchers may analyze either fraction or use both for further biological work.
A basic workflow places the biological mixture into a centrifuge tube, selects suitable rotor conditions, and spins the sample so its components redistribute into pellet and supernatant fractions. Afterward, the desired fraction can be retained for analysis or further preparation. The chosen speed, duration, and rotor design depend on the separation required.
Biology researchers apply centrifugation to harvest cells and to fractionate organelles, meaning they separate internal cellular components for individual study. These preparations can support microscopy and biochemical analysis by concentrating or isolating material before examination. The technique therefore connects sample processing with investigations of cellular structure and function.
Centrifugation helps prepare nucleic acids and proteins by separating target material from other sample components or by clarifying the material being studied. It also contributes to diagnostic workflows, where obtaining a useful pellet or supernatant can improve the suitability of a biological sample for subsequent analysis. Its value lies in making complex mixtures more manageable.