Ammonium sulfate is often used for precipitation or fractionation of proteins or for purification. Ammonium sulfate is also used in the crystallization of nucleic acids and proteins.
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Stupp, Y., et. al. (1969) Determination of antibody-hapten equilibrium constants by an ammonium sulfate precipitation technique. Journal of Immunology, 625.
King, T.P., (1972) Separation of proteins by ammonium sulfate gradient solubilization. Biochemistry, 11 (3), 367–371.
Foster, P.R. (1976) The kinetics of protein salting-Out: Precipitation of yeast enzymes by ammonium sulfate. Biotechnology and Bioengineering, 545-580.