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PEGylation involves the formation of a stable covalent bond between activated poly (ethylene glycol) polymers and polypeptidic drugs and molecules. This process causes a change in protein hydrophobicity and results in variance between the obtained conjugates. Despite this, hydrophobic interaction chromatography (HIC) is used less frequently for separation of PEGylation reaction products than other techniques. Separation of PEGylated conjugates of Ribonuclease A (RNase A) via HIC on monolithic supports was analyzed in this work. The protein was PEGylated in the N-terminal amino group with 20 kDa methoxy poly (ethylene glycol) propionaldehyde.
