HS-PEG-CH2COOH

Alpha-(sulfanyl)-omega-(carboxymethyl) poly(ethylene glycol) (HS-PEG-CH2COOH) is a heterobifunctional precision PEG derivative with a defined chain length. The two ends bear thiol and carboxymethyl groups, respectively. Discrete chain lengths with different degrees of polymerization are available. The thiol can add to maleimides or participate in disulfide formation, offering different molecular conjugation routes. The carboxymethyl group can be activated for coupling with primary amines. Its single methylene group defines the local connection between the reactive carboxyl group and the polyether chain. The two end groups can be coupled sequentially using compatible reactions and appropriate protection strategies, enabling surface immobilization, functional-molecule bridging, and directional spacer synthesis.

Customization available.