Use of alcohol co-solvents to improve pegylation reaction yields

摘要

Disclosed is a method of producing a composition of matter. The method involves obtaining a pharmacologically active peptide; and conjugating the peptide to a pharmaceutically acceptable polyethylene glycol (PEG) by reacting the peptide with a PEG-aldehyde compound at a free amine moiety on the peptide in a buffer solution comprising an alcohol co-solvent.