Centrifuge Operation
Centrifuge Operation - 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...
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...
01:05
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...
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,...
13:54
In-vivo Centrifugation of Drosophila Embryos
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Cited by 20 •
2010
We describe a method to separate organelles by density in living Drosophila embryos. Embryos are embedded in agar and centrifuged. This technique yields reproducible separation of major organelles along the anterior-posterior embryo axis. This method facilitates colocalization experiments and yields organelle fractions for biochemical analysis and transplantation experiments.
FAQs
Sedimentation depends on several interacting variables rather than rotational speed alone. Particle size and density influence how readily material moves outward, while the liquid medium’s viscosity can slow that movement. Rotational speed and run time determine the strength and duration of the separation. Adjusting these factors helps researchers favor concentration, clarification, or separation of particular biological components.
Larger or denser particles generally sediment more readily than smaller or less dense particles under the same conditions. This difference allows a sample to form a concentrated pellet while other material remains in the liquid. In biological work, the resulting separation can distinguish cells, organelles, or other sample components according to their sedimentation behavior.
The medium affects how easily particles move through the sample during spinning. Higher viscosity can resist particle movement and reduce the rate of sedimentation, whereas the particles’ size and density determine how strongly they respond to centrifugal acceleration. Considering the medium is therefore important when interpreting whether a run will concentrate material or leave components in the liquid.
Rotor selection matches the centrifuge setup to the intended sample handling and separation task, while careful balancing keeps the rotating load distributed appropriately. Together, these practices support safe, reproducible operation. Poor attention to either factor can compromise the consistency of sedimentation and make biological results less reliable, particularly when comparing samples across repeated runs.
A typical workflow begins by selecting an appropriate rotor and considering the sample’s sedimentation behavior. Samples are then balanced, and rotational speed and run time are chosen to produce the intended concentration or clarification. After spinning, the researcher uses the separated pellet or liquid fraction for the next analytical step, such as microscopy, protein analysis, or nucleic acid purification.
Researchers apply centrifugation when they need to concentrate cells, collect organelles, or clarify a lysate before downstream analysis. The technique can also prepare material for microscopy, protein analysis, and nucleic acid purification. Its value comes from converting differences in sedimentation behavior into a practical sample-preparation step within broader biological research workflows.
In clinical laboratories, centrifugation supports separation of blood components, while biological researchers use it to process cells, organelles, and lysates. The same underlying control of speed, time, medium, and rotor conditions can produce different sample fractions for later examination. This makes centrifuge operation a shared foundation linking routine laboratory preparation with specialized biological analyses.