How to quantify PEG attached to protein or nanoparticle? Here are the methods you can rely on!
PEGylation involves covalently attaching PEG molecules to protein for example, typically at specific functional groups (e.g., lysine residues or N-terminal amines). The degree of PEGylation (number of PEG molecules per protein molecule) or the total mass of PEG attached must be quantified.