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The basic operation process of protein purification system
Date: 2025-09-21Read: 2
Protein purification is an important step in biological and biochemical research, aimed at isolating and purifying specific proteins from complex biological samples for further analysis of their structure, function, and interactions. The process of protein purification usually involves multiple steps, including cell lysis, centrifugation, filtration, chromatography and other technical means, combined with different separation principles and methods, to achieve efficient separation and purification of target proteins.
The basic steps of protein purification:
1. Sample preparation
First, extract total protein from cells or tissues. This step typically involves cell lysis, centrifugal separation, and removal of cell debris. The commonly used methods for cell lysis include ultrasonic disruption, freeze-thaw method, chemical lysis method, etc.
2. Preliminary separation and concentration
The extracted protein sample contains a large amount of other cellular components, such as nucleic acids, lipids, etc. By centrifugation, precipitation, and other methods, unwanted impurities can be removed to obtain a relatively pure protein extract.
3. Chromatographic separation
This step is the most critical step in protein purification. Common chromatographic techniques include:
-Ion exchange chromatography: Separation based on protein charge differences.
-Gel filtration chromatography: use the molecular size difference of proteins for separation.
-Affinity chromatography: Separation of target proteins based on their affinity for specific ligands.
-Reverse phase chromatography: Separation based on the hydrophobicity of proteins.
4. Detection and verification
In the process of protein purification, continuous testing is required to verify the purification effect. Common detection methods include SDS-PAGE electrophoresis Westernblot、 Mass spectrometry analysis, etc.
Protein Purification SystemComposition:
1. Protein extraction device: used to break down cells or tissues and extract proteins from them. Usually, equipment such as crushers, centrifuges, filters, etc. are required.
2. Chromatography equipment: The chromatography system consists of chromatography columns, pumps, flow meters, distributors, etc., used for separating and purifying target proteins.
3. Detection instruments: such as UV Vis spectrophotometer, used to detect protein concentration; Or real-time monitoring of the purification process can be achieved through technologies such as mass spectrometry and liquid chromatography.
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