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However, solvation by ions in an electrolytic solution or water will decrease protein–protein attractive forces. Therefore, to precipitate or induce accumulation of proteins, the hydration layer around the protein should be reduced. The purpose of the added reagents in protein precipitation is to reduce the hydration layer.
As different proteins have different compositions of amino acids, different protein molecules precipitate at different concentrations of salt solution. [citation needed] Unwanted proteins can be removed from a protein solution mixture by salting out as long as the solubility of the protein in various concentrations of salt solution is known.
The protein manufacturing cost remains high and there is a growing demand to develop cost efficient and rapid protein purification methods. Understanding of the different protein purification methods and optimizing the downstream processing are critical to minimize production costs while maintaining the quality of acceptable standards of homogeneity. [2]
By contrast, later salts in the series increase the solubility of nonpolar molecules ("salting in") and decrease the order in water; in effect, they weaken the hydrophobic effect. [14] [15] The "salting out" effect is commonly exploited in protein purification through the use of ammonium sulfate precipitation. [16]
The protein of interest then reduces its surface area, which diminishes its contact with the solvent. This is shown by the folding and self-association, which ultimately leads to precipitation. The folding and self-association of the protein pushes out free water, leading to an increase in entropy and making this process energetically favorable ...
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