Which change in solution composition would cause a protein to elute from a hydrophobic interaction column?A.Decreasing pHB.Increasing pHC.Decreasing salt concentrationD.Increasing salt concentration

Hydrophobic Interaction Chromatography (HIC) is a method for protein purification that is based on the hydrophobicity of the protein. In this method, proteins are eluted by decreasing the salt concentration of the solution.

So, the change in solution composition that would cause a protein to elute from a hydrophobic interaction column is:

C. Decreasing salt concentration

Here's why:

In HIC, a high salt concentration is initially used to promote the interaction between the hydrophobic groups of the protein and the hydrophobic ligands of the column. This interaction is what initially retains the protein on the column.

When the salt concentration is decreased, the hydrophobic interactions are weakened. This is because water molecules, which are more polar than the salt ions, replace the salt ions in the hydration shell around the hydrophobic groups of the protein. This increases the solubility of the protein in the solution and decreases its affinity for the hydrophobic ligands on the column. As a result, the protein is eluted from the column.

Changes in pH (either increasing or decreasing) can also affect protein elution, but they are not typically the primary method for eluting proteins in HIC.

Hydrophobic interaction chromatography (HIC) is a method for separating proteins based on their hydrophobicity. In HIC, proteins are eluted by decreasing the salt concentration of the buffer. This is because high salt concentrations promote hydrophobic interactions between the protein and the column, while decreasing the salt concentration reduces these interactions, allowing the protein to elute.

So, the correct answer is C. Decreasing salt concentration.