Centrifugation is a procedure that uses centrifugal force to separate mixtures. Denser components move away from the axis of rotation while less dense components move towards the axis. The document discusses the principles, types (low speed, high speed, ultracentrifuges), applications, and techniques (preparative, differential, density gradient) of centrifugation. It provides details on rotor types, speeds, uses for separating organelles, macromolecules, and more. Diagrams illustrate basic centrifuge components and a table compares characteristics of different centrifuge types.
Centrifugation principle and types by Dr. Anurag YadavDr Anurag Yadav
concept of cnetrifugation,
basic Principle
centrifugal force
types of centrifugation based on use and rotor type
application of the each type of centrifuge
Ultracentrifuge in detail
application in general
Centrifugation is the separation technique commonly used in clinical and research laboratories.
It is based on the behavior of particles in an applied centrifugal field.
More dense components of the mixture move away from the axis of the centrifuge while less dense components of the mixture move towards the axis.
A biochemical technique used for isolation of molecules on the basis of size ,shape & density. Categorized into two types:
1) Analytical ultracentrifugation
2) Preparative ultracentrifugation
It is an important tool in biochemical research. Which through rapid spinning imposes high centrifugal forces on suspended particles, or even molecules in solution, and causes separations of such matter on the basis of differences in weight.
Introduction
Definition
Components of centrifuge
Types of centrifugation
Application
Conclusion
References
A centrifugation is a technique for separating particles from a solution according to their size, shape, density, viscosity of the medium and rotor speed.
Centrifugation is a process which involves the use of the centrifugal force for the sedimentation of heterogeneous mixtures with centrifuge used in laboratory. If the particle size in dispersion is 5 micro meter or less then they undergo Brownian motion hence don't sediment under gravity. Therefore a stronger force , centrifugal force is applied to separate the suspended particles.
Centrifugation principle and types by Dr. Anurag YadavDr Anurag Yadav
concept of cnetrifugation,
basic Principle
centrifugal force
types of centrifugation based on use and rotor type
application of the each type of centrifuge
Ultracentrifuge in detail
application in general
Centrifugation is the separation technique commonly used in clinical and research laboratories.
It is based on the behavior of particles in an applied centrifugal field.
More dense components of the mixture move away from the axis of the centrifuge while less dense components of the mixture move towards the axis.
A biochemical technique used for isolation of molecules on the basis of size ,shape & density. Categorized into two types:
1) Analytical ultracentrifugation
2) Preparative ultracentrifugation
It is an important tool in biochemical research. Which through rapid spinning imposes high centrifugal forces on suspended particles, or even molecules in solution, and causes separations of such matter on the basis of differences in weight.
Introduction
Definition
Components of centrifuge
Types of centrifugation
Application
Conclusion
References
A centrifugation is a technique for separating particles from a solution according to their size, shape, density, viscosity of the medium and rotor speed.
Centrifugation is a process which involves the use of the centrifugal force for the sedimentation of heterogeneous mixtures with centrifuge used in laboratory. If the particle size in dispersion is 5 micro meter or less then they undergo Brownian motion hence don't sediment under gravity. Therefore a stronger force , centrifugal force is applied to separate the suspended particles.
ION EXCHANGE CHROMATOGRAPHY
ByM.Vharshini
B.Sc. Bio Medical Science
Sri Ramachandra University
ION EXCHANGE CHROMATOGRAPHY
Ion-exchange chromatography is a process that allows the separation of ions and polar molecules based on their affinity to the ion exchanger.
It can be used for almost any kind of charged molecule including large proteins, small nucleotides and amino acids.
Cations or Anions can be separated using this method.
PRINCIPLE
It is based on the reversible electrostatic interaction of ions with the separation matrix (i.e.)
The separation occurs by reversible exchange of ions between the ions present in the solution and those present in the ion exchange resin.
CLASSIFICATION OF RESINS
According to the chemical nature they classified as-
1. Strong cation exchange resin
2. Weak cation exchange resin
3. Strong anion exchange resin
4. Weak anion exchange resin
According to the Source they can -
Natural resins : Cation - Zeolytes, Clay
Anion - Dolomite
Synthetic resins: Inorganic & Organic resins
◘Organic resins are polymeric resin matrix.
The resin composed of –
Polystyrene (sites for exchangeable functional groups)
Divinyl benzene(Cross linking agent)-offers stability.
Ion exchange resin should have following requirements
»It must be chemically stable.
»It should be insoluble in common solvents.
» It should have a sufficient degree of cross linking.
»The swollen resin must be denser than water.
»It must contain sufficient no. of ion exchange groups.
Physical properties of ion exchange resins
Cross linking:
It affects swelling & strength & solubility
Swelling:
When resin swells, polymer chain spreads apart
Polar solvents → swelling
Non-polar solvents → contraction
Swelling also affected electrolyte concentration.
Particle size and porosity
Increase in surface area & decrease in particle size will increase the rate of ion exchange.
Regeneration
Cation exchange resin are regenerated by treatment with acid, then washing with water.
Anion exchange resin are regenerated by treatment with NaOH, then washing with water until neutral.
EXPERIMENTAL SETUP OF ION EXCHANGE CHROMATOGRAPHY
Metrohm 850 Ion chromatography system
Instrumentation of ion exchange chromatography
PRACTICAL REQUIREMENTS
1.Column
» glass, stainless steel or polymers
2.Packing the column
» Wet packing method:
A slurry is prepared of the eluent with the stationary phase powder and then carefully poured into the column. Care must be taken to avoid air bubbles.
3.Application of the sample
After packing, sample is added to the top of the stationary phase, use syringe or pipette.
This layer is usually topped with a small layer of sand or with cotton or glass wool to protect the shape of the organic layer from the velocity of newly added eluent.
4.Mobile phase
Acids, alkalis, buffers…
6.Stationary phase
The ionic
Centrifugation is a technique used for the separation of particles from a solution according to their size, shape, density, viscosity of the medium and rotor speed. The particles are suspended in a liquid medium and placed in a centrifuge tube. The tube is then placed in a rotor and spun at a define speed.
Sedimentation, Basic principle of sedimentation,Nomograph, Centrifugal force, Angular velocity, Type of rotars, Geometry of rotars,Types of centrifuge, calculation of centrifugal field, Safety measures for centrifuges.
A centrifuge operates by using the sedimentation principle- Here the substances are separated based on their density under the influence of gravitational force. When spun rapidly, lighter particles stay at the top and heavier particles go to the bottom during centrifugation.The components of heterogeneous mixtures are detached by centrifugation. That comprises liquids in liquids, solids in fluids, and gases in solids and liquids. In order to transfer bulky sections to the outside of the pipe, centrifugation uses centrifugal energy. It allows the solid to settle more easily and completely.The components of heterogeneous mixtures are detached by centrifugation. That comprises liquids in liquids, solids in fluids, and gases in solids and liquids. In order to transfer bulky sections to the outside of the pipe, centrifugation uses centrifugal energy. It allows the solid to settle more easily and completely.
What is the centrifuge used for?
Centrifuges work by separating out two materials with different densities. Centrifuges are used in various laboratories to separate fluids, gases or liquids based on density like the separation of different constituents of blood, immiscible liquids, wastewater sludge etc.
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http://sandymillin.wordpress.com/iateflwebinar2024
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• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
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1. Student Name: Sageer Abass Rather
M. Sc-Biotech (1st Semister)
Topic: Centrifugation
2. Centrifugation
• Bibliography
• Its Principle
• Applications of
Centrifugations
Types of Centrifuges
& Its Uses &
Characteristics
• Instrumentations
for Centrifugation
3. Centrifugation is a procedure that involves the use of
centrifugal force for the sedimentation of mixture with a
centrifuge used in industry and in laboratory settings. More
dense components of the mixture move away from the axis of
the centrifuge while less dense components of the mixture
move towards the axis
4. A particle whether it is a precipitate a macromolecule or a cell organelle is
subjected to a centrifugal force when it is rotated at a high rate of speed. The
centrifugal force F is denoted by equation
F=mω2 r
Where
F= intensity of the centrifugal force
m= effective mass of the sedimenting particle
ω= angular velocity of rotation
r= distance of the migrating particles from the central axis of
rotation
A more common measurement of F in terms of the earths gravitation force , g, is
relative centrifugal force, RCF its defined by
RCF = (1.119 x 10-5 (rpm)2 (r)
This equation relates RCF to revolutions per minute of the sample . Equation dictates
that the RCF on a sample will vary with r, the distance of the sedimenting particles
from the axis of rotation . The RCF value is reported as “ a number times gravity ,g .”
5. A laboratory tabletop centrifuge. The
rotating unit, called the rotor, has fixed
holes drilled at an angle (to the vertical).
Test tubes are placed in these slots and
the motor is spun. As the centrifugal
force is in the horizontal plane and the
tubes are fixed at an angle, the particles
have to travel only a little distance before
they hit the wall and drop down to the
bottom. These angle rotors are very
popular in the lab for routine use.
6. The basic centrifuge consists of two components one is Electric motor with
drive shaft to spin the sample and a Rotor to hold tubes or other containers of
the sample. A wide variety of centrifuges are available ranging from a low
speed centrifuge used for routine pelleting of relatively heavy particles. There
are three types of centrifuges
1.Low –speed centrifuges .
Its also called as clinical centrifuge.
>>
The common centrifuge has a maximum speed in the range of 4000
to 5000 rpm with RCF value approx. up to 3000Xg. These instruments usually
operate at low temperature with no means of temperature control of the
samples.
>>
Two types of rotors fixed angle and swinging bucket may be used in
this instruments.
continue….
7. >>
Low speed centrifuges are especially useful for the rapid
sedimentation of coarse precipitates or red blood cells.
>>
The sample is centrifuged until the particles are packed into a pellet
at the bottom of the tube. The upper liquid portion, the supernatant, is then
separated by decantation.
2. High Speed Centrifuges:
>> High speed centrifuges for more sophisticated biochemical applications.
Higher speeds and temperature control of the rotor chambers are
essential.
>> Rotor chambers in most instruments are maintained at or near 40 C.
Three types of rotors are available for high speed centrifugation.
a. Fixed Angel rotor.
b. Swinging –bucket rotors
c. vertical rotor
>> High speed centrifuges are used to sediment
>Cell debris after cell homogenization.
>Ammonium sulfate precipitates of proteins and cellular organelles such
as chloroplasts, mitochondria and nuclei.
8.
9. 3.
Ultracentrifuge s:
>>
The most sophisticated of the centrifuges are the
ultracentrifuges because of the high speeds attainable intense
heat is generated in the rotor so the spin chamber must be
refrigerated and placed under high vacuum to reduce friction.
>>
it is a high speed centrifuge that has fixed head rotors .It
is mainly used in separation of lipoproteins .since the
separation is long process there is generation of heat and thus
are provided with internal cooling system.
>>
Ultracentrifuges can be used both for preparative work
as well as for analytical. Preparative models its primarily used
for separations and purification of samples for further analysis
and analytical models which are designed for performing
physical measurements on the sample during sedimentation.
10.
11. Types of Centrifuges & applications
Types of centrifuge
Characteristic
Range of Speed (rpm)
Low Speed
High Speed
Ultracentrifuge
1-6000
1000-25,000
20-80,000
Maximum RCF (g)
6000
50,000
6,00,000
Refrigeration
some
Yes
Yes
Pelleting of cells
Yes
Yes
Yes
Pelleting of nuclei
Yes
Yes
Yes
Pelleting of organelles
No
Yes
Yes
Pelleting of ribosomes
No
No
Yes
Pelleting of Macromolecules
No
No
Yes
Applications
12. Preparative Techniques
Centrifuges in undergraduate biochemistry laboratories
are used most often for preparative – scale separation .
This technique is quite straightforward consisting of
placing the sample in a tube or similar container inserting
the tube in the rotor and spinning the sample for a fixed
period. The sample is removed and the two phases ,pellet
and supernatant may be separated by careful decantation
further characterization or analysis is usually carried out
on the individual phases . This technique called as
velocity sedimentation centrifugation, separates particles
ranging in size from coarse precipitates to cellular
organelles .
13. In this process a tissue is first
Homogenised to break the cell
membranes and mix up the cell
contents. The homogenate is then
subjected to repeated centrifugations.
Each time removing the plat and
increasing the centrifugal force.
Finally purification may be done
through equilibrium sedimentation
and the desired layer extracted for
further analysis . Separation is based
on size and density, with larger and
denser particles pelleting at lower
centrifugal force. Although the
technique is similar to preparative
differential centrifugation but the
goal of an experiment is to measure
the sedimentation coefficient of the
particle
14. A procedure for separating particles such as viruses or ribosome
or molecules such as DNA in which the sample is placed on a
preformed gradient such as sucrose or cesium chloride.
Upon centrifugation either by rate zonal or equilibrium
procedures, the macromolecules are 'banded' in the gradient
and can be collected as a pure fraction .
Density gradient centrifugation permits the separation of
multicomponent mixtures of macromolecules and the
measurement of sedimentation coefficient .
Two methods are used zonal centrifugation in which the simple
is centrifuged in a preformed gradient and isopycnic
centrifugation in which a self generating gradients forms during
centrifugation.
15. * Modern Experimental Biochemistry By BOYER
* Biotechnology by U. Satyanarauana
* Internet