Centrifugation Cycles
Centrifugation Cycles - 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...
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...
09:09
Preparation of Primary Acute Lymphoblastic Leukemia Cells in Different Cell Cycle Phases by Centrifugal Elutriation
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Cited by 6 •
2017
This protocol describes the use of centrifugal elutriation to separate primary acute lymphoblastic leukemia cells into different cell cycle phases.
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
Each cycle can progressively enrich the sedimented fraction because liquid removal discards suspended components while resuspension makes the retained material available for another separation. The outcome depends on how particle size, density, and shape govern movement through the fluid. Repetition therefore supports concentration or contaminant reduction rather than relying on one separation event.
Relative centrifugal force determines the strength of the applied separation, while cycle duration determines how long particles experience that force. Temperature adds a sample-preservation constraint, and resuspension conditions affect how evenly the pellet is returned to the fluid. Coordinating these variables helps balance separation performance with sample integrity and reproducible processing.
Pellet formation and supernatant retention provide two distinct fractions that can be handled differently across cycles. Removing the supernatant targets suspended contaminants, whereas resuspending the pellet prepares retained cells, microorganisms, proteins, nanoparticles, or other biomaterials for continued processing. This fraction-specific handling is central to washing and recovery workflows.
Begin by setting the intended relative centrifugal force, duration, and temperature, then centrifuge the sample until a sedimented fraction forms. Remove the liquid phase without losing the retained material, resuspend the pellet under controlled conditions, and repeat the sequence as needed for the desired recovery, washing, or concentration outcome.
They are useful when a single separation must also provide repeated washing or concentration. Bioengineering workflows may apply them to cells, microorganisms, proteins, nanoparticles, and other biomaterials. The approach is especially relevant when processing seeks to recover a retained fraction while reducing unwanted contaminants through successive handling steps.
Tracking the pellet and supernatant across cycles helps indicate whether material is being retained, removed, washed, or concentrated. The retained pellet reflects the fraction carried forward, while the liquid phase contains components left suspended. Comparing these fractions can guide adjustments to force, duration, temperature, or resuspension for more consistent outcomes.