M-PEG11-Tos

M-PEG11-Tos is a heterobifunctional PEG derivative featuring a hydrophilic polyethylene glycol spacer for enhanced aqueous solubility and a terminal tosylate group that acts as an efficient leaving group in nucleophilic substitution reactions. This reagent is widely used in bioconjugation for modifying peptides, proteins, and surfaces in both in vitro assays and in vivo drug delivery research to improve pharmacokinetic properties.