Ion exchange chromatography

 Ion-exchange chromatography separates proteins according to their net charge. The stationary phase of the column will have a specific charge.  For example negatively charged proteins (anions) will bind to a positively charged diethylaminoethylcellulose (DEAE-cellulose) columns. The negative proteins bound to column can by eluted by adding a negatively charged buffer which will compete with the protein for binding to the column. Proteins that have lower charge density will be eluted first from the column. (Stryer 6th edition).Figure 1 is simplified diagram of ion-exchange chromatography.