Salting out process involves: (A) Precipitation of proteins using ammonium sulphate, (B) Precipitation of proteins using sodium chloride, (C) Precipitation of proteins usingcopper sulphate, (D) None of these
Answer is A. Salting out : Most proteins are less soluble at high salt concentrations, an effect called salting out. The salt concentration at which a protein precipitates differs from one protein to another. Hence, salting out can be used to fractionate proteins. For example, 0.8 M ammonium sulfate precipitates fibrinogen, a blood-clotting protein, whereas a concentration of 2.4 M is needed to precipitate serum albumin. Salting out is also useful for concentrating dilute solutions of proteins, including active fractions obtained from other purification steps.