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Frequently Asked Questions

A centrifuge is a laboratory instrument used for the separation of heterogeneous mixtures or samples.

RPM (Rotations Per Minute) refers to the number of rotations the rotor completes per minute. RCF (Relative Centrifugal Force – G-Force), on the other hand, is the actual gravitational force applied to the sample. RCF (G-force) should always be used as the reference in laboratory protocols because RPM values vary depending on the rotor radius, whereas RCF indicates the actual separation force experienced by the sample. Modern AI-supported centrifuges can automatically convert between these two values.

  • Fixed-Angle Rotors: Hold tubes at a fixed angle, typically around 45 degrees. Due to the short sedimentation path length, they enable very rapid sample separation and are commonly used in microcentrifuges. The pellet (sediment) forms along the side wall and bottom of the tube.
  • Swing-Out Rotors: As the centrifuge accelerates, the tubes swing into a horizontal position. These rotors are particularly preferred for blood separation using gel tubes, as they help maintain distinct layers and create a flat separation interface without mixing. They are widely used in clinical laboratories. The pellet accumulates directly at the bottom of the tube.

The maximum speed (RCF) requirement, the total tube volume and number of tubes to be centrifuged in a single run (capacity), whether the samples require refrigeration, the availability of rotor and adapter options compatible with the tube types to be used, and safety systems such as vibration/imbalance detection should all be carefully evaluated.

Description

What Is a Laboratory Centrifuge? Types and Applications

In laboratory processes, separating components, cells, or macromolecules with different densities within a liquid mixture is the first and most critical step in many analyses and R&D studies. Laboratory centrifuges are essential basic laboratory equipment that separate samples into layers according to density differences by using centrifugal force generated through high-speed rotation, based on the sedimentation principle.
Centrifuge technology is available in a wide range of models with different volume and speed requirements, from clinical diagnostics to genetic research.

Main Applications of Laboratory Centrifuges

  • Clinical and Medical Diagnostics: Centrifugation of whole blood samples to separate them into whole blood cells, plasma, and serum components for biochemistry and hormone tests is a fundamental part of routine laboratory processes. They are also used in urine sediment analysis and gel tube separation.
  • Biotechnology and Cell Culture: They play a critical role in collecting cells from cell suspensions by sedimentation, isolating cell organelles, and performing protein/nucleic acid purification steps.
  • Molecular Biology and Genetics: They are indispensable for DNA/RNA isolation protocols, pre- and post-PCR (Polymerase Chain Reaction) cleanup steps, and the separation of microliter-scale samples.
  • Environmental and Industrial Analyses: They are widely preferred for separating suspended solids in water, wastewater, and soil samples, as well as for quality control and product purification processes in the pharmaceutical, food, and chemical industries.

Main Types of Centrifuges and Their Technical Features

Laboratory centrifuges are categorized according to the application purpose, temperature sensitivity of the sample, and tube volume as follows:

1. Benchtop General-Purpose Centrifuges

These are compact devices with medium speed and capacity, commonly found in laboratories. They are ideal for daily routine blood/urine separation and general chemistry applications. Both refrigerated and non-refrigerated (ventilated) models are available.

2. Microcentrifuges (Eppendorf Centrifuges)

These are generally designed to work with very small-volume microtubes such as 1.5 ml or 2.0 ml tubes. They are devices that can rapidly reach high speeds of 14,000–15,000 RPM for DNA/RNA extraction in molecular biology, genetics, and biochemistry laboratories.

3. High-Speed and Refrigerated Centrifuges

Refrigerated centrifuge models are essential when working with thermolabile proteins, enzymes, or cellular components whose structure may be damaged by temperature changes. They generally offer precise temperature control between -10°C and +40°C and can reach high RCF (G-force) values.

4. Ultracentrifuges (Advanced Research Type)

These are advanced devices capable of exceeding 100,000 revolutions per minute (RPM) and generating extremely high centrifugal forces. They are used in advanced molecular research and virology laboratories for applications such as separating cellular macromolecules, virus particles, protein fractions, and nanomaterials.

5. Cytospin (Cytology) Centrifuges

These are specialized devices designed to spread liquid samples containing cell suspensions, such as CSF, sputum, or fine needle aspirations, directly onto a microscope slide as a monolayer. They are key equipment in pathology and cytology laboratories.

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