mPEG-Br

mPEGn-Br is primarily used as an alkylating agent for nucleophilic substitution reactions with thiols, amines, or carboxylates, enabling covalent PEGylation of proteins, small molecules, and functional surfaces. Its key advantages include high reactivity, tunable PEG length (n), and straightforward conjugation under basic conditions, though the bromide group may exhibit hydrolysis sensitivity requiring anhydrous handling.