Selecting a Centrifuge on Amazon.com
A centrifuge separates liquids by spinning them at high speeds. A sample is placed in a centrifuge tube within the centrifuge and is spun to separate the components by density, with higher density components sinking to the bottom of the tube. Centrifuges are often used in medical, veterinary, pharmaceutical, and research facilities, and classrooms to perform DNA and other blood testing.
Centrifuges are categorized by speed and temperature. Low-speed centrifuges have speeds up to 5,000 rpm, high-speed centrifuges have speeds up to 20,000 rpm, and ultracentrifuges have speeds up to 100,000 rpm. Though most models do not have temperature control, some have heating or cooling capability. A heated or refrigerated centrifuge maintains a temperature deemed safe for the sample being processed. Some models have both heating and cooling capability that is customizable to the operator's needs.
Centrifuges are available in a variety of sizes and capacities that include benchtop and floor-standing models. A benchtop centrifuge holds small to medium size samples, while a benchtop microcentrifuge holds microtubes. A floor-standing industrial centrifuge generally has a higher capacity than benchtop models and can hold a range of tube sizes, depending on the rotor type. The centrifuge rotor is the working part of the centrifuge that holds the sample. Liquids are placed in a tube that is held in the rotor while it spins at a set speed to separate components. Rotors are designed to hold a specific tube size and fit a specific size machine. For example, a rotor designed for a benchtop model will not work with a floor-standing model.
Features to consider when selecting a centrifuge configuration include model dimensions, rotor type and capacity, the size of the sample tube, temperature control, and the speed at which samples will be processed. Manufacturers include Eppendorf.