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	[[Category:Electrophoresis]]		[[Category:Electrophoresis]]
	[[Category:Biochemistry techniques]]		[[Category:Biochemistry techniques]]
			== Affinity_electrophoresis ==
			<gallery>
			File:Affinityelectrophoreses1.jpg\|Affinity electrophoresis
			File:Figure_displaying_gel_electrophoresis.png\|Gel electrophoresis display
			</gallery>

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{{Short description|A technique used to separate molecules based on their affinity for a specific ligand}}

'''Affinity electrophoresis''' is a [[biochemical]] technique that combines the principles of [[electrophoresis]] and [[affinity chromatography]] to separate molecules based on their specific interactions with a ligand. This method is particularly useful for analyzing [[protein]]-[[ligand]] interactions, [[enzyme]]-[[substrate]] interactions, and [[antibody]]-[[antigen]] interactions.

==Principle==
Affinity electrophoresis involves the migration of molecules through a [[gel]] matrix under the influence of an electric field. The gel contains a ligand that specifically binds to the target molecule. As the molecules migrate, those with a higher affinity for the ligand will move more slowly compared to those with lower affinity. This differential migration allows for the separation of molecules based on their binding properties.

==Types of Affinity Electrophoresis==
There are several variations of affinity electrophoresis, each designed to study different types of interactions:

===1. Immunoelectrophoresis===
[[Immunoelectrophoresis]] is used to analyze [[antigen]]-[[antibody]] interactions. In this method, antigens are separated by electrophoresis and then allowed to react with antibodies in the gel, forming precipitin lines that indicate the presence of specific antigens.

===2. Enzyme-Substrate Electrophoresis===
This variation is used to study [[enzyme]]-[[substrate]] interactions. The gel contains a substrate that interacts with the enzyme, allowing for the separation of enzyme isoforms based on their substrate affinity.

===3. Ligand Affinity Electrophoresis===
In ligand affinity electrophoresis, the gel is embedded with a specific ligand that binds to the target molecule. This method is used to study the binding affinity of various molecules to the ligand.

==Applications==
Affinity electrophoresis is widely used in [[biochemistry]] and [[molecular biology]] for:

* Characterizing [[protein]]-[[ligand]] interactions
* Analyzing [[enzyme]] kinetics and specificity
* Identifying [[antigen]]-[[antibody]] interactions
* Studying [[nucleic acid]] interactions

==Advantages and Limitations==

===Advantages===
* High specificity due to the use of specific ligands
* Ability to analyze complex mixtures
* Useful for studying weak interactions

===Limitations===
* Requires prior knowledge of the ligand
* Limited by the availability of suitable ligands
* May require optimization of gel conditions

==Gallery==
<gallery>
File:Affinityelectrophoreses1.jpg|Diagram of affinity electrophoresis setup
File:Figure_displaying_gel_electrophoresis.png|Illustration of gel electrophoresis
</gallery>

==Related pages==
* [[Electrophoresis]]
* [[Affinity chromatography]]
* [[Immunoelectrophoresis]]
* [[Protein-ligand interaction]]

[[Category:Electrophoresis]]
[[Category:Biochemistry techniques]]

Affinity electrophoresis - Revision history

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